Bump iOS XCTest timeout for ExecuTorchLLMTests

[psiddh]

Summary:
The 13 XCTestCase methods in
xplat/executorch/extension/llm/apple:ExecuTorchLLMTests
(testLLaMA, testPhi4, testGemma, testLLaVA, testVoxtral and their
reset variants) regularly hit the 1800-second per-test ceiling
enforced by fbobjc/Tools/xctest_runner for the long_running
label. LLM inference on iOS-sim CPU (1B-class models,
128-768 token sequences, each test calls generate() twice)
routinely exceeds 30 minutes per test method, producing spurious
"Test timed out after 1800 seconds" flakes on the test-issues
dashboard for owner ai_infra_mobile_platform.

Per the runner formula
TEST_CASE_TIMEOUT(60s) * label_multiplier * 3:

label	multiplier	per-XCTestCase budget
long_running	x10	1800s
glacial (here)	x30	5400s

Switching to glacial (the highest tier supported by the runner)
gives each test 90 minutes. Adding
test_test_rule_timeout_ms = 14400000 sets the bundle-level
wall-clock budget to 4h, which is comfortable headroom for ~5
testcases at 90 min each plus xctest setup/teardown.

Note: this diff is unrelated to T269848646. T269848646 tracks a
separate cluster of 446 iOS-sim test-run cancellations
(duration: 0.00, "test execution was cancelled because the test
run was cancelled") that is owned by testinfra and is not
addressed here.

Reviewed By: shoumikhin

Differential Revision: D104147313

[pytorch-bot]

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❌ 1 New Failure, 17 Unrelated Failures

As of commit 879d3a8 with merge base af90130 ():

NEW FAILURE - The following job has failed:

• pull / unittest-editable / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_conv2d.py::TestConv2d::test_fp16_conv2d

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-lora-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-lora-multimethod-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-models-linux (ic4, portable, linux.4xlarge.memory) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-models-linux (ic4, xnnpack-quantization-delegation, linux.4xlarge.memory) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-models-linux (mobilebert, portable, linux.2xlarge) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-models-linux (mobilebert, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-models-linux (phi_4_mini, portable, linux.4xlarge.memory) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-moshi-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-phi-3-mini-runner-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-sqnr-static-llm-qnn-linux (smollm2_135m) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-voxtral-realtime-xnnpack-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-vulkan-models-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest / linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest / macos / macos-job (gh) (trunk failure)
  [ FAILED ] OpGridSampler2dTest.BatchSizeMismatchDies
• pull / unittest / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[meta-codesync]

@psiddh has exported this pull request. If you are a Meta employee, you can view the originating Diff in D104147313.

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[Copilot]

Pull request overview

This PR adjusts the Buck test configuration for the iOS LLM XCTest bundle to reduce spurious timeouts during long CPU-based simulator inference runs.

Changes:

• Switches the test label from long_running to glacial to increase the per-XCTestCase timeout tier.
• Sets a larger rule-level wall-clock timeout for the generated test bundle via test_test_rule_timeout_ms.

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Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.

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Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.