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Progress Log

Session: 2026-05-27 Four-Case Optimization Implementation

Setup

  • Status: in_progress
  • Actions taken:
    • Accepted user's requirement to implement optimizations 1-4 serially with one sub-agent per optimization.
    • Added a new implementation plan to task_plan.md.
    • Confirmed current dirty state has untracked planning files and an untracked external analysis doc; these will not be staged or reverted unless requested.
    • Initially spawned extra agents for optimizations 2 and 3 by mistake; immediately shut them down. Continuing strictly serially with only the FOuLa agent active.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/task_plan.md
    • /Volumes/QUQ/working/dacpp/progress.md

Phase 1: FOuLa Owner-Loop Cleanup and Larger Temporal Block

  • Status: complete
  • Actions taken:
    • Sub-agent implemented FOuLa owner-loop temporal cleanup in LoopLocalStencilOwnerLoop.cpp.
    • Parent reviewed diff: only FOuLa owner-loop codegen and FOuLa1.0/mpi_expect.txt changed.
    • Parent verified generated evidence in /Volumes/QUQ/working/mpi_tmp/FOuLa1.0: one scatter_window_1d_temporal, no ordinary scatter_window_1d(__or_initial_col, and __or_temporal_block_size = 8.
  • Verification:
    • cmake --build build --target translator -j8 passed.
    • bash clang/tools/translator/test_mpi.sh FOuLa1.0 passed 1/1.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/LoopLocalStencilOwnerLoop.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/FOuLa1.0/mpi_expect.txt

Phase 2: Spatial-2D Halo Runtime Optimization

  • Status: complete
  • Actions taken:
    • Sub-agent optimized exchange_halo_2d_spatial_inplace scratch allocation in OperatorResidentRuntime.h.
    • Parent reviewed diff: no call-site/signature changes, no post-use/materialization changes, no FOuLa files touched.
    • Parent verified generated stencil/wave still use distribution=spatial-2d accepted, halo-width=2, and exchange_halo_2d_spatial_inplace.
  • Verification:
    • git diff --check -- clang/tools/translator/dpcppLib/include/mpi/operator_resident/OperatorResidentRuntime.h passed.
    • cmake --build build --target translator -j8 passed.
    • bash clang/tools/translator/test_mpi.sh stencil1.0 waveEquation1.0 passed 2/2.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/dpcppLib/include/mpi/operator_resident/OperatorResidentRuntime.h

Phase 3: Larger Temporal Block for Stencil/Wave

  • Status: complete
  • Actions taken:
    • Replacement sub-agent completed the partial temporal-block diff for StencilWindow2D.
    • Parent reviewed the structural changes: 2D resident-halo temporal block is now 4, spatial halo width follows the block size, and generated code includes runtime narrow-partition fallback to block size 1.
    • Parent verified the touched structure fixtures still report expected accepted/rejected paths.
  • Verification:
    • cmake --build build --target translator -j8 passed.
    • bash clang/tools/translator/test_mpi.sh stencil1.0 waveEquation1.0 passed 2/2.
    • bash clang/tools/translator/test_mpi.sh mpiLoopStencilCountGuard2D mpiMixedStencilORPhaseC spatialStencil2DOneStep passed 3/3.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/OperatorChainAnalysis.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/StencilWindowCodegen.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/stencil1.0/mpi_expect.txt
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/waveEquation1.0/mpi_expect.txt
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/mpiLoopStencilCountGuard2D/mpi_expect.txt
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/mpiMixedStencilORPhaseC/mpi_expect.txt
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/spatialStencil2DOneStep/mpi_expect.txt

Phase 4: Partial Materialization for Row/Print Post-Use

  • Status: complete
  • Actions taken:
    • A first optimization-4 worker launch failed due to a gpt-5.3-codex service-channel 503 before making code changes.
    • Per user instruction, launched replacement worker 019e688c-6f81-7f91-9697-e44e8038af35 with model gpt-5.5; it failed before code changes because the selected model was at capacity.
    • Launched retry worker 019e6896-a856-7373-8722-0dcbf5ecda98 with model gpt-5.5 and service tier priority.
    • Worker scope is limited to fixed-row .print() partial materialization, with full .print() fallback preserved for waveEquation1.0 and imageAdjustment1.0.
    • Parent reviewed the resulting shared post-use and stencil materialization changes.
    • Parent tightened the implementation so spatial-2d fixed-row print gathers one row slice per owning rank with MPI_Gatherv instead of per-element send/recv.
    • stencil1.0 now logs matIn post-use=fixed-row-print and generated code revises only the printed row while rejecting the old full gather_spatial_owned_to_root(__or_owned_out) path.
    • waveEquation1.0 still logs matCur post-use=full fallback reason=member call on tensor, and imageAdjustment1.0 still uses full final output gather for image_tensor3.print().
  • Verification:
    • git diff --check passed.
    • cmake --build build --target translator -j8 passed.
    • bash clang/tools/translator/test_mpi.sh stencil1.0 waveEquation1.0 imageAdjustment1.0 passed 3/3.
    • bash clang/tools/translator/test_mpi.sh vectorAddCombo mandel1.0 FOuLa1.0 passed 3/3.
    • Follow-up regression batch initially exposed stale mpiMixedStencilORPhaseC expectations: its stencil phase also has a root-guarded fixed-row matIn[0].print() and now correctly uses fixed-row materialization instead of full spatial gather.
    • Updated mpiMixedStencilORPhaseC/mpi_expect.txt to assert fixed-row row-slice gather while preserving PhaseC partial-exchange checks.
    • bash clang/tools/translator/test_mpi.sh mpiMixedStencilORPhaseC passed 1/1.
    • bash clang/tools/translator/test_mpi.sh FOuLa1.0 stencil1.0 waveEquation1.0 imageAdjustment1.0 mpiLoopStencilCountGuard2D mpiMixedStencilORPhaseC spatialStencil2DOneStep vectorAddCombo mandel1.0 passed 9/9.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/include/mpi/shared/PostUseSyncPlan.h
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/shared/PostRegionAnalysis.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/shared/OutputSyncAnalysis.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/OperatorChainAnalysis.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/StencilWindowCodegen.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/stencil1.0/mpi_expect.txt

Session: 2026-05-27 Four-Case Shenwei Efficiency Diagnosis

Phase 1-3: Analysis

  • Status: complete
  • Actions taken:
    • Restored planning context and reused generated large-case MPI/SYCL outputs in /Volumes/QUQ/working/analysis_tmp/four_case_codegen.
    • Inspected generated code for imageAdjustment1.0, waveEquation1.0, stencil1.0, and FOuLa1.0.
    • Inspected resident-halo runtime for spatial scatter, gather, and halo exchange implementations.
    • Compared generated structure with hand-written MPI/SYCL references in the four test directories.
    • Recorded case-by-case bottleneck findings in findings.md.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/findings.md
    • /Volumes/QUQ/working/dacpp/progress.md

Session: 2026-05-22 stencil1 spatial-k2 profitability follow-up

Phase 1: Discovery and Reproduction

  • Status: in_progress
  • Actions taken:
    • Restored planning context and confirmed branch tqc-2 at b2afd4588.
    • Confirmed pre-existing unrelated deleted files remain in the worktree and will not be reverted or staged.
    • Added this session's plan to task_plan.md.
    • Re-read the required OR plan/analysis/codegen/runtime files and the target stencil1.0, spatialStencil2DOneStep, mpiLoopStencilCountGuard2D, mpiMixedStencilORPhaseC, and waveEquation1.0 fixtures.
    • Temporarily removed the spatial-k2 post-use profitability gate for measurement only; stencil1.0 accepted spatial-k2 structurally, confirming the gate is the current blocker.
    • Ran an experimental 4-rank, 3-trial profile for bounded stencil1.0 spatial-k2 in /Volumes/QUQ/working/mpi_tmp/profile_segments_p11_stencil1_spatial_k2_experiment. It was correct but slow (dac_wall_median_s=4.838048), with the time dominated by kernel (4496.731972 ms) while materialize stayed microsecond-scale.
    • Restored the profitability fallback and tightened the translator reject reason to name host post-use plus the current rectangular buffer path.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/task_plan.md
    • /Volumes/QUQ/working/dacpp/progress.md
    • /Volumes/QUQ/working/dacpp/findings.md
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/OperatorChainAnalysis.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/stencil1.0/mpi_expect.txt
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/mpiMixedStencilORPhaseC/mpi_expect.txt
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/docs/mpi_translator/mpi_32node_top10_optimization_plan_2026-05-21.md

Phase 4: Verification and Profile

  • Status: complete
  • Results:
    • cmake --build build --target translator -j8 passed.
    • bash clang/tools/translator/test_mpi.sh stencil1.0 spatialStencil2DOneStep mpiLoopStencilCountGuard2D mpiMixedStencilORPhaseC passed 4/4.
    • bash clang/tools/translator/test_mpi.sh mandel1.0 FOuLa1.0 liuliang1.0 MDP1.0 waveEquation1.0 passed 5/5.
    • Related rg fixtures passed 8/8: DFT1.0 decay1.0 gradientSum imageAdjustment1.0 jacobi1.0 matMul1.0 oddeven0.1 vectorAddCombo.
    • Final requested profile in /Volumes/QUQ/working/mpi_tmp/profile_segments_p11_stencil1_spatial_k2_final passed all six cases status ok. Key medians: stencil1.0 DAC wall 0.846273 s, waveEquation1.0 DAC wall 1.024449 s, mandel1.0 DAC wall 2.321547 s.

Phase 5: Commit and Push

  • Status: complete
  • Actions taken:
    • Confirmed git diff --cached --name-status contained only four task-relevant files before commit.
    • Committed 6207a0f6b Refine stencil spatial k2 profitability.
    • Pushed 6207a0f6b to origin/tqc-2.

Session: 2026-05-22 P11 2D Spatial Block Partition

Phase 1: Discovery

  • Status: complete
  • Actions taken:
    • Confirmed branch tqc-2 at 228fd3158 with only the user-reported unrelated dirty deletions plus untracked planning files.
    • Read P11 optimization-plan section, OR plan structures, 2D resident-halo analysis/codegen, runtime row-halo helpers, and stencil1.0 expectations/source.
    • Identified a conservative first implementation target: canonical B2 StencilWindow2D resident halo, no direct reader, no scalar readers, 3x3 stride-1 window, followup (1,1), and canonical boundary-local self-copy loops.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/task_plan.md
    • /Volumes/QUQ/working/dacpp/findings.md
    • /Volumes/QUQ/working/dacpp/progress.md

Phase 2: Design and Implementation

  • Status: complete
  • Actions taken:
    • Added spatial-2d plan metadata/logs under StencilResidentHaloMetadata.
    • Accepted only canonical B2 StencilWindow2D resident halo shapes; direct-reader B3 now logs an explicit spatial rejection while keeping the row-temporal path.
    • Added runtime rectangle layout, process-grid ownership, rectangle scatter, point-to-point edge/corner halo exchange, spatial owned slices, spatial root gather reassembly, and spatial owner lookup.
    • Extended resident-halo 2D codegen for accepted spatial-2d and kept row fallback for rejected/direct-reader cases.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/include/mpi/operator_resident/OperatorResidentPlan.h
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/OperatorChainAnalysis.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/StencilWindowCodegen.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/dpcppLib/include/mpi/operator_resident/OperatorResidentRuntime.h

Phase 3: Fixtures and Documentation

  • Status: complete
  • Actions taken:
    • Updated stencil1.0/mpi_expect.txt for accepted distribution=spatial-2d logs and generated-code evidence.
    • Updated waveEquation1.0/mpi_expect.txt for explicit spatial rejection and preserved row-temporal direct-reader recurrence.
    • Updated mpiLoopStencilCountGuard2D/mpi_expect.txt for accepted no-use spatial-2d resident halo.
    • Added P11 Implementation Status to the optimization plan.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/stencil1.0/mpi_expect.txt
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/waveEquation1.0/mpi_expect.txt
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/mpiLoopStencilCountGuard2D/mpi_expect.txt
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/docs/mpi_translator/mpi_32node_top10_optimization_plan_2026-05-21.md

Phase 4: Verification

  • Status: in_progress
  • Results:
    • cmake --build build --target translator -j8 passed.
    • bash clang/tools/translator/test_mpi.sh stencil1.0 passed.
    • P6-P10 regression batch passed after expectation updates: mandel1.0, FOuLa1.0, liuliang1.0, MDP1.0, and waveEquation1.0.
    • Related fixture batch passed 11/11: stencil1.0, mpiLoopStencilCountGuard2D, mpiLoopStencilOrderReject2D, mpiLoopStencilScalarReject2D, mpiDistributedStencil2DRowBlock, mpiOrStencilBoundaryStride2D, mpiMixedStencilORPhaseC, mpiOrReadWriteAccumulate2D, jacobi1.0, imageAdjustment1.0, and waveEquation1.0.
    • Requested profile probe in /Volumes/QUQ/working/mpi_tmp/profile_segments_p11_probe passed all six requested cases with status ok.
    • Profile structural evidence: stencil1.0 logs distribution=spatial-2d accepted and generated code contains exchange_halo_2d_spatial_inplace; waveEquation1.0 logs distribution=spatial-2d rejected reason=direct-reader recurrence requires row-layout role rotation and keeps temporal-block=2 accepted direct-reader recurrence.
    • Performance note: stencil1.0 4-rank profile is slower (dac_wall_median_s=8.687478) because the first P11 spatial subset deliberately uses one-step halo exchange and keeps k=2 temporal blocking on row fallback only.
    • New continuation: implemented B2 spatial temporal-block=2. cmake --build build --target translator -j8 passed after runtime/codegen fixes.
    • stencil1.0 now logs distribution=spatial-2d accepted stencil halo-width=2 ... temporal-block=2 accepted; manual 1/2/4-rank runs matched baseline before expectations were updated.
    • bash clang/tools/translator/test_mpi.sh stencil1.0 spatialStencil2DOneStep mpiLoopStencilCountGuard2D mpiMixedStencilORPhaseC passed 4/4 after updating structure expectations.
    • bash clang/tools/translator/test_mpi.sh mandel1.0 FOuLa1.0 liuliang1.0 MDP1.0 waveEquation1.0 passed 5/5; waveEquation1.0 remains row-temporal direct-reader with explicit spatial rejection.
    • Related fixtures from rg were checked with bash clang/tools/translator/test_mpi.sh DFT1.0 decay1.0 gradientSum imageAdjustment1.0 jacobi1.0 matMul1.0 oddeven0.1 vectorAddCombo, passing 8/8.
    • First full profile with spatial k=2 showed stencil1.0 bounded-post-use spatial k=2 was too slow (dac_wall_median_s=4.778941), so added a generic profitability fallback: spatial temporal-block=2 now requires no host post-use and otherwise logs row-temporal retention.
    • After fallback, stencil1.0, mpiMixedStencilORPhaseC, and large profile variants retain row-temporal k=2; mpiLoopStencilCountGuard2D still accepts spatial k=2 because both reader/writer post-use are none.
    • Final target checks after fallback passed: cmake --build build --target translator -j8; bash clang/tools/translator/test_mpi.sh stencil1.0 mpiLoopStencilCountGuard2D mpiMixedStencilORPhaseC waveEquation1.0; and bash clang/tools/translator/test_mpi.sh mandel1.0 FOuLa1.0 liuliang1.0 MDP1.0 waveEquation1.0 DFT1.0 decay1.0 gradientSum imageAdjustment1.0 jacobi1.0 matMul1.0 oddeven0.1 vectorAddCombo.
    • Final requested profile in /Volumes/QUQ/working/mpi_tmp/profile_segments_p11_spatial_k2_probe passed all six cases. Key medians: stencil1.0 DAC wall 0.864732 s, waveEquation1.0 DAC wall 0.947056 s, mandel1.0 DAC wall 2.352500 s.

Phase 5: Staging Review and Delivery

  • Status: complete
  • Actions taken:
    • Confirmed no files are staged.
    • Confirmed P11-relevant tracked edits are limited to OR runtime/plan/analysis/codegen, three MPI expectations, and the optimization plan doc.
    • Left unrelated pre-existing deleted files and untracked planning files untouched.

Session: 2026-05-11

Phase 1: Requirements & Discovery

  • Status: complete
  • Started: 2026-05-11
  • Actions taken:
    • Created planning files (task_plan.md, findings.md, progress.md)
    • Analyzed ResidentBufferCodegen.cpp - found emitRowPartitionFullRowScatter function
    • Analyzed gradientSum generated code - shows pack + Scatterv pattern
    • Identified fast path conditions: indexedBindPos == 0 (row partition with indexed on outer dim)
  • Files created/modified:
    • /Volumes/QUQ/working/dacpp/task_plan.md
    • /Volumes/QUQ/working/dacpp/progress.md

Phase 2: Planning & Structure

  • Status: complete
  • Fast path detection: indexedBindPos == 0 && !broadcastIndexedPayload
  • Skip MPI_Scatterv and use MPI_Bcast + direct buffer access
  • Each rank calculates offset and reads its portion directly

Phase 3: Implementation

  • Status: complete
  • Actions taken:
    • Added fast path detection: else if (indexedBindPos == 0) branch in emitRowPartitionFullRowScatter
    • Fast path uses MPI_Bcast to broadcast packed buffer to all ranks
    • Each rank reads its portion directly using std::copy_n with calculated offset
    • Maintains existing Scatterv paths for non-fast-path cases (broadcastIndexedPayload, usesByte, default)
  • Files created/modified:
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/ResidentBufferCodegen.cpp

Phase 4: Testing & Verification

  • Status: complete
  • Actions taken:
    • Generated unified diff patch (saved to /tmp/gradientSum_fastpath.patch)
    • Verified patch adds new else-if branch for indexedBindPos == 0
    • Patch maintains existing behavior for other cases
  • Files created/modified:
    • /tmp/gradientSum_fastpath.patch

Phase 5: Delivery

  • Status: complete

Test Results

Test Input Expected Actual Status

Error Log

Timestamp Error Attempt Resolution
1

5-Question Reboot Check

Question Answer
Where am I? Phase 1
Where am I going? Phases 2-5 (Planning, Implementation, Testing, Delivery)
What's the goal? Add fast path to skip MPI_Scatterv when input is row-partitioned
What have I learned? See findings.md (empty, to be filled)
What have I done? Created planning files, starting code analysis

Session: 2026-05-19 Constant Init Local Fill + Async Halo Runtime

Phase 1: Discovery

  • Status: in_progress
  • Actions taken:
    • Restored existing planning context for prior RowBlock2D, post-use reduction, and post-use sync work.
    • Confirmed working tree has existing dirty/untracked files; will not revert or clean them.
    • Added this session's plan to task_plan.md.
    • Inspected OR plan structs, post-use analysis helpers, resident input codegen, stencil-window codegen, and resident halo runtime.
    • Recorded initial findings: resident window init still scatters from root, and 1D/2D halo runtime uses blocking MPI_Sendrecv plus per-call neighbor lookup.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/task_plan.md
    • /Volumes/QUQ/working/dacpp/progress.md
    • /Volumes/QUQ/working/dacpp/findings.md

Session: 2026-05-19 Host Post-Use Partial Materialization

Phase 1: Discovery

  • Status: in_progress
  • Actions taken:
    • Restored existing planning context and session catchup.
    • Confirmed working tree is dirty with prior translator/test changes; will not revert or clean unrelated files.
    • Added this session's plan to task_plan.md.
    • Inspected OutputSync/PostRegion analysis/codegen and OR plan structures.
    • Recorded that existing sync classification is coarse and mandel reduction already uses per-param skip flags.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/task_plan.md
    • /Volumes/QUQ/working/dacpp/progress.md
    • /Volumes/QUQ/working/dacpp/findings.md

Phase 3: Implementation

  • Status: in_progress
  • Actions taken:
    • Added a lightweight shared post-use sync plan header so OR plan structs can store post-use sync metadata without including the full MPI common header.
    • Fixed compile issues in PostRegionAnalysis.cpp by adding the required AST visitor/parent-map includes.
    • cmake --build build --target translator -j8 passed after the interface fixes.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/include/mpi/shared/PostUseSyncPlan.h
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/include/Rewriter_MPI_Common.h
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/include/mpi/operator_resident/OperatorResidentPlan.h
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/shared/PostRegionAnalysis.cpp

Phase 4: Target Verification

  • Status: in_progress
  • Actions taken:
    • Fixed bounded-index AST extraction for chained TensorProxy subscript temporaries so tensor[0][0] records two indices instead of one.
    • Added resident-halo bounded-index final sync for row-block 2D resident tensors, including a conservative constant-boundary shortcut that root can materialize directly.
    • Updated waveEquation1.0/mpi_expect.txt to require matPrev final gather to be absent.
    • Target correctness passed for waveEquation1.0, mandel1.0, vectorAddCombo, and imageAdjustment1.0.
    • Probe profile for large waveEquation1.0 hit post-use=bounded-index count=1, skipped writer/direct-reader full gathers, and generated no final MPI_Gatherv.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/shared/PostRegionAnalysis.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/StencilWindowCodegen.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/waveEquation1.0/mpi_expect.txt

Phase 5: Full Regression and Profile

  • Status: in_progress
  • Actions taken:
    • Updated stale structure expectations for decay1.0 and mpiLoopStencilCountGuard2D after post-use sync started emitting resident output variables and skipping no-use resident halo materialization.
    • bash clang/tools/translator/test_mpi.sh decay1.0 mpiLoopStencilCountGuard2D passed: 2 tests, 2 passed.
    • Full bash clang/tools/translator/test_mpi.sh passed: 72 tests, 72 passed, 0 failed, 0 skipped.
    • cmake --build build --target translator -j8 passed with no work to do.
    • Target profile passed for waveEquation1.0 mandel1.0 vectorAddCombo imageAdjustment1.0 gradientSum jacobi1.0 at 4 ranks, 3 trials; all status ok.
    • Target profile waveEquation1.0 logs matCur post-use=bounded-index count=1, matPrev post-use=none, matNext post-use=none; generated code contains no final MPI_Gatherv and root writes {0,0} directly from a proven boundary constant.
    • Full profile initially exposed unsupported bounded-owner codegen for DFT1.0 and matMul1.0 (bounded indexed read has no owner); fixed normal OR bounded owner mapping for 1D and row-partitioned 2D outputs, plus plan-time fallback for unsupported bounded layouts.
    • Re-ran final full bash clang/tools/translator/test_mpi.sh: 72 tests, 72 passed, 0 failed, 0 skipped.
    • Re-ran target profile in /Volumes/QUQ/working/mpi_tmp_profile_2026-05-19_postuse_partial_materialize_rerun: all 6 requested cases status ok.
    • Re-ran full profile in /Volumes/QUQ/working/mpi_tmp_profile_2026-05-19_after_postuse_partial_full_rerun: all 14 cases status ok.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/decay1.0/mpi_expect.txt
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/mpiLoopStencilCountGuard2D/mpi_expect.txt

Session: 2026-05-19 RowBlock2D Scatterv + Post-Use Reduction

Phase 1: Discovery

  • Status: in_progress
  • Actions taken:
    • Confirmed working tree has existing dirty/untracked files; will not revert or clean them.
    • Read previous planning files; they describe the earlier gradientSum fast path.
    • Added this session's plan to task_plan.md.
    • Inspected CollectiveCodegenUtils.cpp, PartitionCodegen.cpp, RowBlock2D analysis, output sync analysis, and target imageAdjustment/mandel sources.
    • Created findings.md with the RowBlock2D and mandel observations.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/task_plan.md
    • /Volumes/QUQ/working/dacpp/progress.md
    • /Volumes/QUQ/working/dacpp/findings.md

Phase 2: RowBlock2D Direct Scatterv

  • Status: in_progress
  • Actions taken:
    • Updated PartitionCodegen.cpp RowBlock2D total/local/count/displacement multiplication to use checked/narrow helpers.
    • Replaced the RowBlock2D byte broadcast fast path in CollectiveCodegenUtils.cpp with a direct Scatterv path guarded by getDim()==2, shapes, offset, strides, size, and row-range checks.
    • Direct path covers byte (MPI_BYTE with byte counts/displacements) and non-byte (typed MPI datatype) transports.
    • Fallback remains pack+Scatterv for byte transport and the existing full Bcast+memcpy path for non-byte transport.
    • bash clang/tools/translator/test_mpi.sh imageAdjustment1.0 passed.
    • Generated imageAdjustment MPI code contains __or_rowblock_direct_* and direct MPI_Scatterv(... MPI_BYTE ...); no RowBlock2D input full MPI_Bcast on the fast path.

Phase 3: Post-Use Reduction

  • Status: in_progress
  • Actions taken:
    • Added conservative PostUseReductionPlan and AST matcher for scalar = 0; for (...) { if (tensor[i] == 1) scalar++; }.
    • Added OR output-sync annotation for count-eq-one post-use reductions on root-only/root-centric Contiguous1D outputs.
    • Added wrapper-side local count + MPI_Reduce and suppressed full output gather/materialization when matched.
    • Added rewrite-time replacement of the absorbed scalar reset and post loop.
    • bash clang/tools/translator/test_mpi.sh mandel1.0 passed.
    • Generated mandel MPI code contains MPI_Reduce, no output MPI_Gatherv/array2Tensor, and log shows post-use-reduction=accepted.

Phase 4: Regression

  • Status: complete
  • Actions taken:
    • cmake --build build --target translator -j8 passed.
    • bash clang/tools/translator/test_mpi.sh imageAdjustment1.0 mandel1.0 passed.
    • Full bash clang/tools/translator/test_mpi.sh passed: 72 tests, 72 passed, 0 failed, 0 skipped.
    • Re-ran bash clang/tools/translator/test_mpi.sh after the final post-use reduction profile segment change; it passed again: 72 tests, 72 passed, 0 failed, 0 skipped.
    • Target profile passed for imageAdjustment1.0 mandel1.0 jacobi1.0 gradientSum vectorAddCombo at 4 ranks, 3 trials:
      • gradientSum: dac wall median 0.194373 s, profile median 0.191935 s.
      • imageAdjustment1.0: dac wall median 0.323780 s, profile median 0.323117 s; first RowBlock2D wrapper reports scatter and no input bcast segment.
      • jacobi1.0: dac wall median 0.266413 s, profile median 0.261135 s.
      • mandel1.0: dac wall median 2.570618 s, profile median 2.561264 s; output full gather/materialize is replaced by final_sync reduction in profile.
      • vectorAddCombo: dac wall median 0.262366 s, profile median 0.263657 s.
    • Full profile passed for all 14 benchmarks at 4 ranks, 3 trials:
      • DFT1.0, FOuLa1.0, MDP1.0, decay1.0, gradientSum, imageAdjustment1.0, jacobi1.0, liuliang1.0, mandel1.0, matMul1.0, oddeven0.1, stencil1.0, vectorAddCombo, waveEquation1.0 all status ok.
      • Full profile medians of priority cases: imageAdjustment1.0 0.320296 s, mandel1.0 2.565184 s, jacobi1.0 0.267879 s, gradientSum 0.362276 s wall / 0.209095 s profile, vectorAddCombo 0.265731 s.
    • Verified generated imageAdjustment code uses __or_rowblock_direct_image_tensor and direct MPI_Scatterv(... MPI_BYTE ...) from the tensor storage pointer fast path.
    • Verified generated mandel code contains MPI_Reduce, omits output MPI_Gatherv/array2Tensor for mandelbrot_flags, and logs post-use-reduction=accepted kind=count-eq-one scalar=mandelbrot_count.

Session: 2026-05-19 Constant Init Local Fill + Async Halo Runtime

Phase 1-4: Implementation

  • Status: complete
  • Actions taken:
    • Added ConstantInitPlan to OR parameter planning metadata.
    • Implemented conservative vector-to-tensor constant initialization analysis in OperatorChainAnalysis.cpp.
    • Accepted arithmetic std::vector<T> v(size) as zero and std::vector<T> v(size, constant) for simple literal/value-init constants when no writes/escapes occur before tensor construction and DAC shell use.
    • Added init-sync decision logs and fallback reason logs.
    • Added constant-local codegen for ordinary OR scatter, RowBlock2D full-row resident buffer init, 2D resident halo stencil readers, 2D direct readers copied into halo layout, and 1D resident halo init.
    • Updated waveEquation1.0/mpi_expect.txt to require matCur init-sync=constant-local value=0 and absence of root tensor2Array/scatter_window_2d_rows for cur.
    • Cached nearest nonempty neighbor ranks in 1D and 2D resident halo layouts.
    • Replaced 1D and 2D row halo blocking MPI_Sendrecv exchange with posted MPI_Irecv, posted MPI_Isend, and MPI_Waitall over valid requests, handling MPI_PROC_NULL and zero-size cases.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/include/mpi/operator_resident/OperatorResidentPlan.h
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/OperatorChainAnalysis.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/CollectiveCodegenUtils.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/ResidentBufferCodegen.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/StencilWindowCodegen.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/LoopLoweredStencil1DCodegen.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/dpcppLib/include/mpi/operator_resident/OperatorResidentRuntime.h
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/waveEquation1.0/mpi_expect.txt

Phase 5: Verification and Profile

  • Status: complete
  • Actions taken:
    • cmake --build build --target translator -j8 passed; final rerun reports ninja: no work to do.
    • Target correctness passed: waveEquation1.0, stencil1.0, mpiLoopStencilResidentHalo1D, mpiLoopStencilResidentHaloEmptyRank1D, mandel1.0, and imageAdjustment1.0 all passed.
    • Full bash clang/tools/translator/test_mpi.sh passed: 72 tests, 72 passed, 0 failed, 0 skipped.
    • Target profile in /Volumes/QUQ/working/mpi_tmp_profile_2026-05-19_const_init_async_halo passed all 7 requested cases:
      • gradientSum wall median 0.197594 s, profile median 0.201560 s.
      • imageAdjustment1.0 wall median 0.268278 s, profile median 0.262803 s.
      • jacobi1.0 wall median 0.266960 s, profile median 0.302934 s.
      • mandel1.0 wall median 2.558579 s, profile median 2.572610 s.
      • stencil1.0 wall median 0.889077 s, profile median 0.890001 s.
      • vectorAddCombo wall median 0.264182 s, profile median 0.262226 s.
      • waveEquation1.0 wall median 1.007491 s, profile median 1.023537 s.
    • Target profile waveEquation1.0 segments: scatter median max 13.129500 ms, halo median max 161.549631 ms, materialize median max 0.000625 ms.
    • Suggested full profile in /Volumes/QUQ/working/mpi_tmp_profile_2026-05-19_after_const_init_async_halo_full passed all 14 cases status ok.
    • Full profile waveEquation1.0: wall median 1.019828 s, profile median 1.014860 s, scatter median max 13.710792 ms, halo median max 150.256140 ms, materialize median max 0.000333 ms.
    • Verified full profile generated logs/code:
      • waveEquation1.0 logs input matCur init-sync=constant-local value=0 and generated code skips tensor2Array(__or_initial_global_cur) and scatter_window_2d_rows(__or_initial_global_cur).
      • mandel1.0 logs scalar reduction and generated code contains MPI_Reduce.
      • imageAdjustment1.0 generated code still uses guarded __or_rowblock_direct_image_tensor and direct MPI_Scatterv(... MPI_BYTE ...).

Phase 6: Delivery

  • Status: complete
  • Ready to report modified files, supported/fallback constant-init analysis, async halo details, and test/profile deltas.

Session: 2026-05-19 Decay MPI Wrapper Migration

Phase 1: Discovery

  • Status: in_progress
  • Actions taken:
    • Restored planning context and confirmed existing dirty/untracked files must be preserved.
    • Inspected historical MPI Wrapper code (b0787ebb5, 2e6113d28) and confirmed it gathered output writeback to root and only broadcast when later host reads required all ranks.
    • Confirmed current decay P4.5 direct path already has scalar local refresh (no per-step scalar MPI_Bcast) but still gathers local_A, materializes local_A_tensor, and then executes the source host assignment A_tensor[10*t_tensor[0]] = local_A_tensor.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/progress.md

Session: 2026-05-20 MPI Translator Remaining Priority Cases

VectorAddCombo Verification Setup

  • Status: in_progress
  • Actions taken:
    • Restored handoff context and confirmed branch tqc-2 with existing dirty/untracked files preserved.
    • Rebuilt translator target; ninja reported no work to do.
    • Ran bash clang/tools/translator/test_mpi.sh vectorAddCombo; small initializer-list source passed and logs now fall back to scatter for a/b/c with reason single-argument vector initializer is not a size constructor.
    • Ran bash clang/tools/translator/test_mpi.sh --large vectorAddCombo; translation generated the desired init-sync=index-local for large a/b/c and bounded-prefix sync for out_tensor, but the shared expectation file still described the old full-gather path.
    • Added optional mpi_expect_large.txt support in test_mpi.sh and a large-only vectorAddCombo expectation for index-local input fill plus bounded-index count=16.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/test_mpi.sh
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/vectorAddCombo/mpi_expect_large.txt
    • /Volumes/QUQ/working/dacpp/progress.md

Correctness Regression

  • Status: complete
  • Actions taken:
    • bash clang/tools/translator/test_mpi.sh vectorAddCombo decay1.0 FOuLa1.0 passed: 3/3.
    • bash clang/tools/translator/test_mpi.sh imageAdjustment1.0 jacobi1.0 mandel1.0 waveEquation1.0 stencil1.0 passed: 5/5.
    • First full bash clang/tools/translator/test_mpi.sh run reached 71/72; only mpiMixedStencilORPhaseC failed at process exit with std::system_error: mutex lock failed, after producing the expected output.
    • Diagnosed the failure as static SYCL queue teardown from OR default_queue() colliding with AdaptiveCpp/MPI process shutdown.
    • Changed OR default_queue() to return a heap singleton that intentionally lives until process exit; bash clang/tools/translator/test_mpi.sh mpiMixedStencilORPhaseC then passed.
    • Final rerun of full bash clang/tools/translator/test_mpi.sh passed: 72 tests, 72 passed, 0 failed, 0 skipped.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/dpcppLib/include/mpi/operator_resident/OperatorResidentRuntime.h
    • /Volumes/QUQ/working/dacpp/progress.md

VectorAddCombo Host Init Elision

  • Status: complete
  • Actions taken:
    • Added source-statement tracking for accepted index-local vector initialization loops/assignments.
    • Added rewrite-time aggregation that elides absorbed host vector fill loops when all loop-body statements are proven index-local and otherwise elides only the absorbed assignments.
    • Verified generated large vectorAddCombo replaces the for (int i = 0; i < N; ++i) a/b/c fill loop with /* DACPP MPI index-local vector initialization elided */.
    • bash clang/tools/translator/test_mpi.sh --large vectorAddCombo passed.
    • bash clang/tools/translator/test_mpi.sh vectorAddCombo passed, preserving initializer-list fallback behavior.
    • bash clang/tools/translator/test_mpi.sh vectorAddCombo decay1.0 FOuLa1.0 passed again after the rewrite.
    • Probe profile in /Volumes/QUQ/working/mpi_tmp_profile_vector_elide passed with vectorAddCombo standard median 0.231248 s and DAC wall median 0.237284 s (~0.974x).
  • Files modified:
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/include/mpi/operator_resident/OperatorResidentPlan.h
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/OperatorChainAnalysis.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/Rewriter_MPI.cpp
    • /Volumes/QUQ/working/dacpp/progress.md

Final Verification and Profile

  • Status: complete
  • Actions taken:
    • cmake --build build --target translator -j8 passed (ninja: no work to do after final expectation update).
    • bash clang/tools/translator/test_mpi.sh --large vectorAddCombo passed and checks index-local host init elision.
    • bash clang/tools/translator/test_mpi.sh vectorAddCombo decay1.0 FOuLa1.0 passed: 3/3.
    • bash clang/tools/translator/test_mpi.sh imageAdjustment1.0 jacobi1.0 mandel1.0 waveEquation1.0 stencil1.0 passed: 5/5.
    • Full bash clang/tools/translator/test_mpi.sh after the final edit reached 70 passed, then hit a transient artifact issue at the final stencil1.0/waveEquation1.0 tail (step2.log missing / directory lookup failure). Immediate rerun of bash clang/tools/translator/test_mpi.sh stencil1.0 waveEquation1.0 passed: 2/2.
    • Requested profile in /Volumes/QUQ/working/mpi_tmp_profile_next2 passed all six cases status ok.
    • Final wall ratios from that profile: vectorAddCombo 0.994x, decay1.0 1.199x, FOuLa1.0 0.866x, imageAdjustment1.0 0.475x, jacobi1.0 0.807x, mandel1.0 0.819x.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/progress.md

Phase 2: Scalar Broadcast Migration

  • Status: complete
  • Actions taken:
    • Migrated the old Wrapper broadcast-elision idea to P4.5 loop-lowered direct scalar readers: when the loop-lowered plan materializes every run and has a replicated scalar, each rank refreshes from its local replicated tensor instead of root refreshing and broadcasting each iteration.
    • Tightened the condition to loopLowerMaterializeEveryRun and added scalar-refresh=local-replicated to the P4.5 decision log.
    • Updated decay1.0/mpi_expect.txt to require the local scalar refresh path and absence of MPI_Bcast(&ctx.__or_scalar_t...).
    • Ran a targeted decay profile in /Volumes/QUQ/working/mpi_tmp_profile_2026-05-19_decay_scalar_local: status ok, standard median 0.372869 s, DAC wall median 0.368962 s, no bcast segment.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/LoopLoweredDirectCodegen.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/OperatorChainAnalysis.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/decay1.0/mpi_expect.txt
    • /Volumes/QUQ/working/dacpp/findings.md
    • /Volumes/QUQ/working/dacpp/progress.md

Session: 2026-05-19 MPI Translator Remaining Benchmark Optimization

Phase 1: Restore Context and Discover Entry Points

  • Status: in_progress
  • Actions taken:
    • Restored planning files and ran the planning catchup script.
    • Confirmed current branch tqc-2 tracks origin/tqc-2; visible git dirty state before this session was the existing deleted doc plus untracked planning files.
    • Confirmed no tracked translator code diff was present at session start, so this round can keep code changes tightly attributable.
    • Inspected current constant-init analysis/codegen, bounded-index post-use sync codegen, and relevant OR/post-use search hits.
    • Observed current bounded-index root sync still uses MPI_Allreduce per bounded value to discover owner; this is the Phase 3 target.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/task_plan.md
    • /Volumes/QUQ/working/dacpp/progress.md 2026-05-19 21:03:47 CST

Session: 2026-05-19 Remaining Benchmark Optimization

  • Built translator successfully after aggregate constant-init, static bounded-owner, and partial tensor2Array materialization edits.
  • Correctness passed for imageAdjustment1.0 vectorAddCombo decay1.0 and waveEquation1.0 mandel1.0 stencil1.0.
  • Probe profile /Volumes/QUQ/working/mpi_tmp_profile_probe passed imageAdjustment1.0 and vectorAddCombo (1 trial). Generated code confirms Pixel{100,100,100} local fill, static bounded owner without MPI_Allreduce, and vectorAddCombo large post-use=bounded-index count=16 with host_out.assign(16,{}) plus root getElement.
  • Full test_mpi.sh started. 2026-05-19 21:25:21 CST
  • Full test_mpi.sh first rerun passed 71/72; the only failure was mpiBroadcastTensor2Array structure expectation still requiring full MPI_Gatherv for fixed host indices.
  • Updated clang/tools/translator/tests/mpiBroadcastTensor2Array/mpi_expect.txt to expect bounded tensor2Array post-use (count=2), root-side host_output.assign(8,{})/getElement, and no output MPI_Gatherv/MPI_Bcast.
  • bash clang/tools/translator/test_mpi.sh mpiBroadcastTensor2Array passed. Full rerun started. 2026-05-19 21:44:54 CST
  • Full bash clang/tools/translator/test_mpi.sh rerun passed: 72 tests, 72 passed, 0 failed, 0 skipped.

Session: 2026-05-19 Prefix/Slice Materialization

Phase 1: Restore Context and Discover Current Paths

  • Status: in_progress
  • Actions taken:
    • Restored planning files and catchup context for the tqc-2 branch.
    • Confirmed latest commit is 6924ae4e1 Optimize MPI bounded sync and aggregate init.
    • Confirmed tracked translator code was clean at session start; existing dirty state is the deleted docs file plus untracked planning files, which will be preserved.
    • Added this session's plan to task_plan.md.
    • Inspected current tensor2Array post-use path and profile artifact; found vectorAddCombo large final tensor2Array(host_out) already lowers to bounded 16-value root sync.
    • Inspected decay P4.5 loop-lowered direct codegen; confirmed per-iteration full gather/materialize remains inside __dacpp_mpi_or_DECAY_decay_0_run.
    • Recorded the planned decay fast path: recognize loop-local row writeback into a host matrix and only gather the output vector on iterations whose row matches the fixed post-loop row use.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/task_plan.md
    • /Volumes/QUQ/working/dacpp/progress.md
    • /Volumes/QUQ/working/dacpp/findings.md

2026-05-19 23:03:17 CST

  • Added generic P4.5 loop-lowered selective row materialization metadata/codegen.
  • decay1.0 now recognizes A_tensor[10*t_tensor[0]] = local_A_tensor plus fixed post-loop A_tensor[1] use and emits a guard around the output gather/materialize.
  • The row expression codegen rewrites replicated scalar tensor reads such as t_tensor[0] to the already refreshed local scalar ctx.__or_scalar_t; non-replicated tensor subscripts in row expressions fall back to the existing per-run materialization.
  • cmake --build build --target translator -j8 passed.
  • bash clang/tools/translator/test_mpi.sh decay1.0 passed.

2026-05-19 23:24:04 CST

  • Added generic LoopLocalStencilOwnerLoop fixed-row post-use analysis for owner matrices. It accepts fixed owner-row .print()/root-observable cout reads and falls back on writes, unknown calls, non-fixed rows, multiple rows, or non-output reads.
  • FOuLa owner-loop codegen now materializes only the selected owner row history when accepted, using the owning rank to send one row to root; the old whole-history MPI_Gatherv remains the fallback path.
  • FOuLa owner-loop boundary values are now distributed by two loop-entry boundary-history broadcasts instead of per-step scalar bcasts.
  • Updated FOuLa1.0/mpi_expect.txt and decay1.0/mpi_expect.txt for the new generic paths.
  • bash clang/tools/translator/test_mpi.sh vectorAddCombo decay1.0 FOuLa1.0 passed.
  • bash clang/tools/translator/test_mpi.sh imageAdjustment1.0 jacobi1.0 mandel1.0 waveEquation1.0 stencil1.0 passed.

Session: 2026-05-21 MPI 32-Rank Top3 Optimizations

Implementation

  • Status: complete
  • Actions taken:
    • Added generic OutputInitPlan metadata and output-direct local-default codegen. Write-only outputs skip initial sync; local += accumulation skips sync only when the output vector-backed tensor initializer is proven default/zero and there is no unsafe tensor use before the shell call.
    • Extended constant/index init analysis so ReplicatedFullTensor direct-mapped inputs can use index-local generation, and helper-function wrapper bodies are scanned via the shell argument's enclosing compound/function body.
    • Added conservative RowBlock2D pointwise fusion metadata, fused wrapper emission, fused rewrite handling, and fused local kernel codegen that keeps intermediates as private values inside one SYCL kernel.
    • Tightened RowBlock2D fusion proof so downstream intermediate consumer counts are checked across all OR plans after the writer expression, not only inside the candidate chain.
    • Kept the small matMul1.0 fixture on fallback expectations and added large fixture expectations for the accepted output-local-default path.
    • Updated the optimization plan document with Implementation Status sections under items 1-3.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/include/Rewriter_MPI_OperatorResident.h
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/include/mpi/operator_resident/OperatorResidentPlan.h
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/Rewriter_MPI.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/LocalKernelCodegen.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/OperatorChainAnalysis.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/OperatorResidentCodegen.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/OperatorResidentCodegen_Internal.h
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/OperatorResidentWrapperCodegen.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/ResidentBufferCodegen.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/matMul1.0/matMul.large_dac.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/matMul1.0/mpi_expect.txt
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/matMul1.0/mpi_expect_large.txt
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/DFT1.0/mpi_expect.txt
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/imageAdjustment1.0/mpi_expect.txt
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/docs/mpi_translator/mpi_32node_top10_optimization_plan_2026-05-21.md
    • /Volumes/QUQ/working/dacpp/task_plan.md
    • /Volumes/QUQ/working/dacpp/progress.md

Verification

  • Status: complete
  • Results:
    • cmake --build build --target translator -j8 passed after final edits.
    • bash clang/tools/translator/test_mpi.sh matMul1.0 DFT1.0 imageAdjustment1.0 passed: 3/3.
    • bash clang/tools/translator/test_mpi.sh --large matMul1.0 passed: 1/1.
    • bash clang/tools/translator/test_mpi.sh jacobi1.0 gradientSum vectorAddCombo mpiBroadcastTensor2Array mpiOrReadWriteAccumulate2D passed: 5/5.
    • python3 clang/tools/translator/bench_mpi_profile_segments.py --tmp-dir /Volumes/QUQ/working/mpi_tmp/profile_segments_top3_probe --ranks 4 --trials 1 matMul1.0 DFT1.0 imageAdjustment1.0 passed with status ok for all three cases after the final fusion-consumer proof tightening.
  • Evidence:
    • matMul1.0 profile probe log reports output matC init-sync=local-default value=0 reason=default-initialized local accumulation; generated code contains the output-direct no-read fast-path comment and retains final gather.
    • DFT1.0 profile probe log reports input vec_tensor init-sync=index-local expr=i; generated code fills from __or_range.begin + __or_local_i.
    • imageAdjustment1.0 profile probe log reports chain=0 rowblock-pointwise-fusion=accepted; generated code has one fused RowBlock2D wrapper and Pixel __or_private_image_tensor2{} inside the kernel.

Session: 2026-05-21 MPI Top4-5 Optimizations

Phase 1: Discovery and Contract Mapping

  • Status: complete
  • Actions taken:
    • Read the 2026-05-21 optimization plan and existing planning/progress/findings.
    • Confirmed current branch is tqc-2 tracking origin/tqc-2.
    • Confirmed visible dirty state at session start is unrelated deleted docs/tmp matmul files plus untracked planning files; no tracked translator code diff was present.
    • Added a dedicated local task plan for items 4 and 5.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/task_plan.md
    • /Volumes/QUQ/working/dacpp/progress.md

Implementation

  • Status: complete
  • Actions taken:
    • Added generic P4.5 loop-lowered Contiguous1D scalar-refresh device-time-loop metadata, acceptance/rejection logs, rewrite support, and direct codegen.
    • Kept decay selective-row materialization in place and made the accepted device-time-loop run one SYCL kernel whose work-items loop over time locally.
    • Added conservative P4.6 StencilWindow2D temporal-block metadata/logs and static k=2 codegen only for the proven no-direct-reader 2D resident-halo contract.
    • Added temporal 2D row-halo runtime helpers for widened halo exchange, temporal scatter/layout setup, and owned-slice extraction, with a runtime block-size-1 guard for narrow partitions.
    • Kept waveEquation1.0 direct-reader recurrence on the existing one-step resident-halo path with an explicit rejection log.
    • Fixed loop-contained constant init lookup so enclosing function bodies are scanned for vector declarations before shell calls.
    • Updated decay1.0, stencil1.0, and waveEquation1.0 structure expectations.
    • Appended Implementation Status (2026-05-21) sections under plan items 4 and 5.
  • Files modified:
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/dpcppLib/include/mpi/operator_resident/OperatorResidentRuntime.h
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/include/Rewriter_MPI_OperatorResident.h
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/include/mpi/operator_resident/OperatorResidentPlan.h
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/include/mpi/shared/LoopLoweredRewrite.h
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/Rewriter_MPI.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/legacy_access_pattern/PatternInit.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/LoopLoweredDirectCodegen.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/OperatorChainAnalysis.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/OperatorResidentCodegen.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/operator_resident/StencilWindowCodegen.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/rewriter/lib/mpi/shared/LoopLoweredRewrite.cpp
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/decay1.0/mpi_expect.txt
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/stencil1.0/mpi_expect.txt
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/tests/waveEquation1.0/mpi_expect.txt
    • /Volumes/QUQ/working/dacpp/clang/tools/translator/docs/mpi_translator/mpi_32node_top10_optimization_plan_2026-05-21.md
    • /Volumes/QUQ/working/dacpp/task_plan.md
    • /Volumes/QUQ/working/dacpp/progress.md

Verification

  • Status: complete
  • Results:
    • cmake --build build --target translator -j8 passed; final rerun reported no work to do.
    • bash clang/tools/translator/test_mpi.sh decay1.0 stencil1.0 passed: 2/2.
    • bash clang/tools/translator/test_mpi.sh waveEquation1.0 MDP1.0 FOuLa1.0 liuliang1.0 passed: 4/4.
    • bash clang/tools/translator/test_mpi.sh mpiLoopStencilCountGuard2D mpiLoopStencilResidentHalo1D mpiLoopStencilResidentHaloEmptyRank1D mpiLoopStencilOrderReject2D mpiLoopStencilScalarReject2D passed: 5/5.
    • python3 clang/tools/translator/bench_mpi_profile_segments.py --tmp-dir /Volumes/QUQ/working/mpi_tmp/profile_segments_next45_probe --ranks 4 --trials 1 decay1.0 stencil1.0 waveEquation1.0 MDP1.0 passed with status ok for all four cases.
  • Evidence:
    • decay1.0 log reports scalar-refresh=local-replicated device-time-loop=accepted; generated code contains __dacpp_mpi_or_DECAY_decay_0_run_loop(...) and the P4.5 device time loop comment. Profile segments show 4 kernel calls and 4 gather calls.
    • stencil1.0 log reports temporal-block=2 accepted; generated code contains __or_runtime_temporal_block_size, exchange_halo_2d_rows_temporal_inplace, and owned_slice_2d_rows_temporal. Profile segments show 1200 halo calls for 600 steps on four ranks.
    • waveEquation1.0 log reports temporal-block=2 rejected reason=direct-reader recurrence not enabled for k=2; profile segments stay at 2400 halo calls, matching the conservative fallback.

Clean Performance Comparison

  • Status: complete
  • Method:
    • Created detached clean baseline worktree at /Volumes/QUQ/working/dacpp_perf_baseline_471a9e05 from commit 471a9e05b0a5a9dd9b74e3eb604b65ecc4c90dc6.
    • Built baseline translator independently with cmake --build build --target translator -j8.
    • Reused current worktree translator for the optimized version after cmake --build build --target translator -j8 reported no work to do.
    • Ran the same 4-rank, 5-trial profile probe for both trees: python3 clang/tools/translator/bench_mpi_profile_segments.py --ranks 4 --trials 5 decay1.0 stencil1.0 waveEquation1.0 MDP1.0.
  • Artifacts:
    • Baseline: /Volumes/QUQ/working/mpi_tmp/perf_clean_baseline_471a9e05_top45
    • Current: /Volumes/QUQ/working/mpi_tmp/perf_clean_current_top45
  • Results:
    • decay1.0 DAC wall median improved from 0.270389s to 0.196299s; profile median improved from 0.270192s to 0.150333s. Kernel calls dropped from 2400 to 4.
    • stencil1.0 DAC wall median improved from 0.903623s to 0.857127s; profile median improved from 0.914053s to 0.890786s. Halo calls dropped from 2400 to 1200.
    • waveEquation1.0 DAC wall median improved from 1.074333s to 1.026217s; profile median changed from 1.022129s to 1.072891s. Translation log confirms temporal blocking is rejected for direct-reader recurrence, so it stays on the fallback path. Segment halo calls stayed 2400; halo max was effectively flat (161.349ms to 160.528ms), scatter improved, and the profile-run delta is treated as run-to-run kernel timing noise.
    • MDP1.0 DAC wall median was effectively flat (0.311033s to 0.309380s); profile median improved from 0.312400s to 0.270365s.
  • Conclusion: no clean-check performance regression was observed for the target or nearby cases. The previous single-trial decay1.0 wall-time outlier was a cold-start artifact; median trials show the optimization improves steady-state runtime.

Session: 2026-05-22 Mandel Contiguous1D Block-Cyclic

  • Restored prior planning context; existing task_plan/findings/progress are unrelated untracked files and must not be staged.

  • Baseline bash clang/tools/translator/test_mpi.sh mandel1.0 passed. Current log has Contiguous1D OR, scalar post-use reduction accepted, direct input Scatterv, and no output gather.

  • Ordinary Contiguous1D assumptions found in PartitionCodegen (__or_range/counts_displs_1d), CollectiveCodegenUtils scatter/gather, ResidentBufferCodegen bounded owner, and LocalKernelCodegen item_linear view offsets.

  • New distribution should be opt-in only for independent Contiguous1D map with no read/write output, no direct-reader alias to writer, no downstream resident retention, and scalar reduction or bounded root post-use.

  • First compile attempt failed on sameOrder namespace; fixed by qualifying operator_resident::sameOrder.

  • Final build: cmake --build build --target translator -j8 passed (ninja: no work to do).

  • Final tests passed: mandel1.0 FOuLa1.0 liuliang1.0 MDP1.0 stencil1.0 waveEquation1.0 (6/6) and fixtures mpiBroadcastRootOnlyCout mpiBroadcastTensor2Array mpiOrReadWriteAccumulate1D mpiOrReadWriteAccumulate2D vectorAddCombo gradientSum DFT1.0 matMul1.0 (8/8).

  • Profile probe /Volumes/QUQ/working/mpi_tmp/profile_segments_next10_probe passed all 6 requested cases. Mandel logs block-cyclic scalar reduction; kernel max/(sum/4) ratios were 1.0016, 1.0107, 1.0060.

Session: 2026-05-27 Four-Case Shenwei Efficiency Diagnosis

  • User reports current translated imageAdjustment1.0, waveEquation1.0, stencil1.0, and FOuLa1.0 have poor stable multi-node efficiency on Shenwei, around 1/2.
  • Scope for this session is analysis only: inspect current generated MPI/SYCL code and lowering logic, then explain likely causes before proposing changes.