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main.cc
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/* Copyright 2020 Stanford University
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "main.h"
#include <algorithm>
#include <climits>
#include <vector>
#include <float.h>
#include "realm.h"
#include "core.h"
using namespace Realm;
using namespace Realm::Serialization;
TYPE_IS_SERIALIZABLE(TaskGraph);
// Hack: Track argc/argv in globals to avoid needing to serialize arguments to top_level task.
static int global_argc = 0;
static char **global_argv = NULL;
enum {
TOP_LEVEL_TASK = Processor::TASK_ID_FIRST_AVAILABLE,
SHARD_TASK,
LEAF_TASK,
};
enum {
REDOP_MIN = 11,
REDOP_MAX = 12,
};
enum {
FID_FIRST = 100,
};
#define DECLARE_REDUCTION(CLASS, T, U, APPLY_OP, FOLD_OP, ID) \
class CLASS { \
public: \
typedef T LHS, RHS; \
template <bool EXCLUSIVE> \
static void apply(LHS &lhs, RHS rhs); \
template <bool EXCLUSIVE> \
static void fold(RHS &rhs1, RHS rhs2); \
static const T identity; \
}; \
\
const T CLASS::identity = ID; \
\
template <> \
void CLASS::apply<true>(LHS & lhs, RHS rhs) \
{ \
lhs = APPLY_OP(lhs, rhs); \
} \
\
template <> \
void CLASS::apply<false>(LHS & lhs, RHS rhs) \
{ \
volatile U *target = (U *)&(lhs); \
union { \
U as_U; \
T as_T; \
} oldval, newval; \
do { \
oldval.as_U = *target; \
newval.as_T = APPLY_OP(oldval.as_T, rhs); \
} while (!__sync_bool_compare_and_swap(target, oldval.as_U, newval.as_U)); \
} \
\
template <> \
void CLASS::fold<true>(RHS & rhs1, RHS rhs2) \
{ \
rhs1 = FOLD_OP(rhs1, rhs2); \
} \
\
template <> \
void CLASS::fold<false>(RHS & rhs1, RHS rhs2) \
{ \
volatile U *target = (U *)&rhs1; \
union { \
U as_U; \
T as_T; \
} oldval, newval; \
do { \
oldval.as_U = *target; \
newval.as_T = FOLD_OP(oldval.as_T, rhs2); \
} while (!__sync_bool_compare_and_swap(target, oldval.as_U, newval.as_U)); \
}
DECLARE_REDUCTION(RedopMin, unsigned long long, unsigned long long,
std::min, std::min, std::numeric_limits<unsigned long long>::max())
DECLARE_REDUCTION(RedopMax, unsigned long long, unsigned long long,
std::max, std::max, std::numeric_limits<unsigned long long>::min())
#undef DECLARE_REDUCTION
Event copy(RegionInstance src_inst, RegionInstance dst_inst, FieldID fid,
size_t value_size, Event wait_for)
{
Processor current_proc = Processor::get_executing_processor();
if (dst_inst.address_space() != current_proc.address_space()) {
dst_inst.fetch_metadata(current_proc).wait();
}
if (src_inst.address_space() != current_proc.address_space()) {
src_inst.fetch_metadata(current_proc).wait();
}
CopySrcDstField src_field;
src_field.inst = src_inst;
src_field.field_id = fid;
src_field.size = value_size;
std::vector<CopySrcDstField> src_fields;
src_fields.push_back(src_field);
CopySrcDstField dst_field;
dst_field.inst = dst_inst;
dst_field.field_id = fid;
dst_field.size = value_size;
std::vector<CopySrcDstField> dst_fields;
dst_fields.push_back(dst_field);
return dst_inst.get_indexspace<1, coord_t>().copy(
src_fields, dst_fields, ProfilingRequestSet(), wait_for);
}
SubgraphDefinition::CopyDesc copy_desc(RegionInstance src_inst, RegionInstance dst_inst, FieldID fid,
size_t value_size)
{
Processor current_proc = Processor::get_executing_processor();
if (dst_inst.address_space() != current_proc.address_space()) {
dst_inst.fetch_metadata(current_proc).wait();
}
if (src_inst.address_space() != current_proc.address_space()) {
src_inst.fetch_metadata(current_proc).wait();
}
CopySrcDstField src_field;
src_field.inst = src_inst;
src_field.field_id = fid;
src_field.size = value_size;
std::vector<CopySrcDstField> src_fields;
src_fields.push_back(src_field);
CopySrcDstField dst_field;
dst_field.inst = dst_inst;
dst_field.field_id = fid;
dst_field.size = value_size;
std::vector<CopySrcDstField> dst_fields;
dst_fields.push_back(dst_field);
SubgraphDefinition::CopyDesc copy;
copy.space = dst_inst.get_indexspace<1, coord_t>();
copy.srcs = src_fields;
copy.dsts = dst_fields;
copy.prs = ProfilingRequestSet();
return copy;
}
Event fill(RegionInstance dst_inst, FieldID fid,
const void *value, size_t value_size,
Event wait_for)
{
CopySrcDstField dst_field;
dst_field.inst = dst_inst;
dst_field.field_id = fid;
dst_field.size = value_size;
std::vector<CopySrcDstField> dst_fields;
dst_fields.push_back(dst_field);
return dst_inst.get_indexspace<1, coord_t>().fill(
dst_fields, ProfilingRequestSet(), value, value_size, wait_for);
}
char *get_base(RegionInstance inst, FieldID fid)
{
AffineAccessor<char, 1, coord_t> acc =
AffineAccessor<char, 1, coord_t>(inst, fid);
return reinterpret_cast<char *>(
acc.ptr(inst.get_indexspace<1, coord_t>().bounds.lo));
}
template<typename T>
T gcd(T a, T b)
{
while (b != 0)
{
T old_b = b;
b = a % b;
a = old_b;
}
return a;
}
static long lcm(long a, long b) {
return a * b / ::gcd(a, b);
}
void leaf_task(const void *args, size_t arglen, const void *userdata,
size_t userlen, Processor p)
{
LeafArgs a;
std::vector<uintptr_t> input_ptr;
std::vector<size_t> input_bytes;
{
FixedBufferDeserializer ser(args, arglen);
ser >> a;
ser >> input_ptr;
ser >> input_bytes;
assert(ser.bytes_left() == 0);
}
a.graph.execute_point(a.timestep, a.point,
a.output_ptr, a.output_bytes,
(const char **)input_ptr.data(), (size_t *)input_bytes.data(), a.n_inputs,
a.scratch_ptr, a.scratch_bytes);
}
static Event define_subgraph(Subgraph &subgraph,
bool replayable,
Processor p,
const TaskGraph &graph, size_t graph_index,
long start_timestep, long stop_timestep,
long first_point, long last_point,
long num_fields,
bool force_copies,
const std::vector<std::vector<RegionInstance> > &task_results,
const std::vector<std::vector<std::map<long, std::vector<RegionInstance> > > > &remote_inputs,
const std::vector<std::vector<std::vector<std::map<long, long> > > > &remote_input_slot,
const std::vector<std::vector<std::vector<std::vector<long> > > > &raw_points_not_in_dset,
const std::vector<std::vector<std::vector<std::vector<long> > > > &war_points_not_in_dset,
const std::vector<std::vector<std::vector<char *> > > &result_base,
const std::vector<std::vector<std::vector<std::vector<char *> > > > &input_base,
std::vector<uintptr_t> &input_ptr,
const std::vector<size_t> &input_bytes,
char *scratch_ptr,
void *leaf_buffer,
size_t leaf_bufsize)
{
// Things that have to be interpolated into the subgraph on each instantiation:
// * LeafArgs (field: timestep; other fields are constant)
// * Barriers
// Since the instantiation code is going to deterministically walk
// the arguments in the same order (??) the only thing we need to do
// here is track where that expected offset is going to be in the
// global subgraph args so that we can specify the interpolation in
// the subgraph definition.
SubgraphDefinition definition;
// Keep a running count of bytes serialized in the global subgraph argument buffer.
ByteCountSerializer global_ser;
// Certain fields are going to be used over and over, so serialize
// them once up front and track their locations for interpolation.
std::vector<size_t> global_timestep_offset;
size_t global_timestep_bytes = sizeof(long);
for (long timestep = start_timestep; timestep < stop_timestep; ++timestep) {
global_timestep_offset.push_back(global_ser.bytes_used());
global_ser << timestep;
}
std::vector<size_t> preconditions;
std::vector<std::vector<size_t> > copy_postconditions(num_fields);
size_t next_precondition = 0;
for (long timestep = start_timestep; timestep < stop_timestep; ++timestep) {
long dset = graph.dependence_set_at_timestep(timestep);
long next_dset = graph.dependence_set_at_timestep(timestep + 1);
long last_field_dset = graph.dependence_set_at_timestep(std::max(timestep - num_fields + 1, 0L));
long offset = graph.offset_at_timestep(timestep);
long width = graph.width_at_timestep(timestep);
long last_offset = graph.offset_at_timestep(timestep-1);
long last_width = graph.width_at_timestep(timestep-1);
long next_offset = graph.offset_at_timestep(timestep+1);
long next_width = graph.width_at_timestep(timestep+1);
long fid = FID_FIRST + timestep % num_fields;
long last_fid = FID_FIRST + (timestep + num_fields - 1) % num_fields;
for (long point = first_point; point <= last_point; ++point) {
// Gather inputs
long n_inputs = 0, slot = 0;
preconditions.clear();
for (auto interval : graph.dependencies(dset, point)) {
for (long dep = interval.first; dep <= interval.second; ++dep) {
preconditions.push_back(next_precondition++);
if (dep >= last_offset && dep < last_offset + last_width) {
char *data = result_base.at(graph_index).at(dep).at(last_fid - FID_FIRST);
if (point >= offset && point < offset + width) {
if (data && !force_copies) {
// Data available locally
} else {
// Data is remote
data = input_base.at(graph_index).at(point - first_point).at(slot).at(last_fid - FID_FIRST);
}
}
input_ptr.at(n_inputs) = reinterpret_cast<uintptr_t>(data);
n_inputs++;
}
slot++;
}
}
// Dependencies can occur in one of two ways:
// 1. The dependent task is local, so copy is not necessary.
// (In this case the dependency catches on the task itself.)
// 2. The dependent task is non-local, so copy is necessary.
// (In this case the dependency catches on the copy.)
// WAR dependencies (part 1)
for (auto interval : graph.reverse_dependencies(last_field_dset, point)) {
for (long dep = interval.first; dep <= interval.second; ++dep) {
if (dep >= next_offset && dep < next_offset + next_width) {
// Only copy when the dependent task doesn't live in the same address space.
if (!force_copies && result_base.at(graph_index).at(dep).at(last_fid - FID_FIRST)) {
preconditions.push_back(next_precondition++);
}
}
}
}
// WAR dependencies (part 2)
for (auto interval : graph.reverse_dependencies(next_dset, point)) {
for (long dep = interval.first; dep <= interval.second; ++dep) {
if (dep >= next_offset && dep < next_offset + next_width) {
if (force_copies || !result_base.at(graph_index).at(dep).at(last_fid - FID_FIRST)) {
preconditions.push_back(next_precondition++);
}
}
}
}
// Launch task
size_t task_postcondition = SIZE_MAX;
if (point >= offset && point < offset + width) {
LeafArgs leaf_args = {
.point = point,
.timestep = LONG_MIN, // to be interpolated
.graph = graph,
.output_ptr = result_base.at(graph_index).at(point).at(fid - FID_FIRST),
.output_bytes = graph.output_bytes_per_task,
.scratch_ptr = scratch_ptr,
.scratch_bytes = graph.scratch_bytes_per_task,
.n_inputs = n_inputs,
};
FixedBufferSerializer ser(leaf_buffer, leaf_bufsize);
ser << leaf_args;
ser << input_ptr;
ser << input_bytes;
assert(ser.bytes_left() == 0);
SubgraphDefinition::TaskDesc task;
task.proc = p;
task.task_id = Processor::TaskFuncID(LEAF_TASK);
task.args = ByteArray(leaf_buffer, leaf_bufsize);
task.prs = ProfilingRequestSet();
task_postcondition = definition.tasks.size();
definition.tasks.push_back(task);
SubgraphDefinition::Interpolation interp;
interp.offset = global_timestep_offset.at(timestep - start_timestep);
interp.bytes = global_timestep_bytes;
interp.target_kind = SubgraphDefinition::Interpolation::TargetKind::TARGET_TASK_ARGS;
interp.target_index = task_postcondition;
interp.target_offset = offsetof(LeafArgs, timestep);
interp.redop_id = 0;
definition.interpolations.push_back(interp);
for (auto precondition : preconditions) {
SubgraphDefinition::Dependency precondition_dep;
precondition_dep.src_op_kind = SubgraphDefinition::OpKind::OPKIND_EXT_PRECOND;
precondition_dep.src_op_index = precondition;
precondition_dep.src_op_port = 0;
precondition_dep.tgt_op_kind = SubgraphDefinition::OpKind::OPKIND_TASK;
precondition_dep.tgt_op_index = task_postcondition;
precondition_dep.tgt_op_port = 0;
definition.dependencies.push_back(precondition_dep);
}
for (auto precondition : copy_postconditions.at(fid - FID_FIRST)) {
SubgraphDefinition::Dependency precondition_dep;
precondition_dep.src_op_kind = SubgraphDefinition::OpKind::OPKIND_COPY;
precondition_dep.src_op_index = precondition;
precondition_dep.src_op_port = 0;
precondition_dep.tgt_op_kind = SubgraphDefinition::OpKind::OPKIND_TASK;
precondition_dep.tgt_op_index = task_postcondition;
precondition_dep.tgt_op_port = 0;
definition.dependencies.push_back(precondition_dep);
}
}
copy_postconditions.at(fid - FID_FIRST).clear();
// RAW dependencies
for (auto interval : graph.reverse_dependencies(next_dset, point)) {
for (long dep = interval.first; dep <= interval.second; ++dep) {
global_ser << Barrier::NO_BARRIER;
size_t complete_offset = global_ser.bytes_used() - sizeof(Barrier);
size_t copy_postcondition = SIZE_MAX;
if (dep >= next_offset && dep < next_offset + next_width) {
// Only copy when the dependent task doesn't live in the same address space.
if (force_copies || !result_base.at(graph_index).at(dep).at(fid - FID_FIRST)) {
long slot = remote_input_slot.at(graph_index).at(point - first_point).at(next_dset).at(dep);
copy_postcondition = definition.copies.size();
definition.copies.push_back(copy_desc(
task_results.at(graph_index).at(point),
remote_inputs
.at(graph_index)
.at(point - first_point)
.at(dep)
.at(slot),
fid, sizeof(char)));
copy_postconditions.at(fid - FID_FIRST).push_back(copy_postcondition);
if (task_postcondition != SIZE_MAX) {
SubgraphDefinition::Dependency task_dep;
task_dep.src_op_kind = SubgraphDefinition::OpKind::OPKIND_TASK;
task_dep.src_op_index = task_postcondition;
task_dep.src_op_port = 0;
task_dep.tgt_op_kind = SubgraphDefinition::OpKind::OPKIND_COPY;
task_dep.tgt_op_index = copy_postcondition;
task_dep.tgt_op_port = 0;
definition.dependencies.push_back(task_dep);
}
}
}
SubgraphDefinition::ArrivalDesc arrival;
arrival.barrier = Barrier::NO_BARRIER; // to be interpolated
arrival.count = 1;
arrival.reduce_value = ByteArray();
size_t arrival_precondition = definition.arrivals.size();
definition.arrivals.push_back(arrival);
SubgraphDefinition::Interpolation interp;
interp.offset = complete_offset;
interp.bytes = sizeof(Barrier);
interp.target_kind = SubgraphDefinition::Interpolation::TargetKind::TARGET_ARRIVAL_BARRIER;
interp.target_index = arrival_precondition;
interp.target_offset = 0;
interp.redop_id = 0;
definition.interpolations.push_back(interp);
if (task_postcondition != SIZE_MAX) {
SubgraphDefinition::Dependency arrival_dep;
if (copy_postcondition != SIZE_MAX) {
arrival_dep.src_op_kind = SubgraphDefinition::OpKind::OPKIND_COPY;
arrival_dep.src_op_index = copy_postcondition;
} else {
arrival_dep.src_op_kind = SubgraphDefinition::OpKind::OPKIND_TASK;
arrival_dep.src_op_index = task_postcondition;
}
arrival_dep.src_op_port = 0;
arrival_dep.tgt_op_kind = SubgraphDefinition::OpKind::OPKIND_ARRIVAL;
arrival_dep.tgt_op_index = arrival_precondition;
arrival_dep.tgt_op_port = 0;
definition.dependencies.push_back(arrival_dep);
}
}
}
// Also need to arrive at any points not included in this
// dset, otherwise we'll deadlock.
for (long dep : war_points_not_in_dset.at(graph_index).at(point - first_point).at(next_dset)) {
(void)dep; // unused
global_ser << Barrier::NO_BARRIER;
size_t barrier_offset = global_ser.bytes_used() - sizeof(Barrier);
SubgraphDefinition::ArrivalDesc arrival;
arrival.barrier = Barrier::NO_BARRIER; // to be interpolated
arrival.count = 1;
arrival.reduce_value = ByteArray();
size_t arrival_precondition = definition.arrivals.size();
definition.arrivals.push_back(arrival);
SubgraphDefinition::Interpolation interp;
interp.offset = barrier_offset;
interp.bytes = sizeof(Barrier);
interp.target_kind = SubgraphDefinition::Interpolation::TargetKind::TARGET_ARRIVAL_BARRIER;
interp.target_index = arrival_precondition;
interp.target_offset = 0;
interp.redop_id = 0;
definition.interpolations.push_back(interp);
// No dependency, it's an unconditional arrival
}
// WAR dependencies
for (auto interval : graph.dependencies(dset, point)) {
for (long dep = interval.first; dep <= interval.second; ++dep) {
global_ser << Barrier::NO_BARRIER;
size_t complete_offset = global_ser.bytes_used() - sizeof(Barrier);
SubgraphDefinition::ArrivalDesc arrival;
arrival.barrier = Barrier::NO_BARRIER, // to be interpolated
arrival.count = 1;
arrival.reduce_value = ByteArray();
size_t arrival_precondition = definition.arrivals.size();
definition.arrivals.push_back(arrival);
SubgraphDefinition::Interpolation interp;
interp.offset = complete_offset;
interp.bytes = sizeof(Barrier);
interp.target_kind = SubgraphDefinition::Interpolation::TargetKind::TARGET_ARRIVAL_BARRIER;
interp.target_index = arrival_precondition;
interp.target_offset = 0;
interp.redop_id = 0;
definition.interpolations.push_back(interp);
if (task_postcondition != SIZE_MAX) {
SubgraphDefinition::Dependency arrival_dep;
arrival_dep.src_op_kind = SubgraphDefinition::OpKind::OPKIND_TASK;
arrival_dep.src_op_index = task_postcondition;
arrival_dep.src_op_port = 0;
arrival_dep.tgt_op_kind = SubgraphDefinition::OpKind::OPKIND_ARRIVAL;
arrival_dep.tgt_op_index = arrival_precondition;
arrival_dep.tgt_op_port = 0;
definition.dependencies.push_back(arrival_dep);
}
}
}
// Also need to arrive at any points not included in this
// dset, otherwise we'll deadlock.
for (long dep : raw_points_not_in_dset.at(graph_index).at(point - first_point).at(dset)) {
(void)dep; // unused
global_ser << Barrier::NO_BARRIER;
size_t barrier_offset = global_ser.bytes_used() - sizeof(Barrier);
SubgraphDefinition::ArrivalDesc arrival;
arrival.barrier = Barrier::NO_BARRIER, // to be interpolated
arrival.count = 1;
arrival.reduce_value = ByteArray();
size_t arrival_precondition = definition.arrivals.size();
definition.arrivals.push_back(arrival);
SubgraphDefinition::Interpolation interp;
interp.offset = barrier_offset;
interp.bytes = sizeof(Barrier);
interp.target_kind = SubgraphDefinition::Interpolation::TargetKind::TARGET_ARRIVAL_BARRIER;
interp.target_index = arrival_precondition;
interp.target_offset = 0;
interp.redop_id = 0;
definition.interpolations.push_back(interp);
if (task_postcondition != SIZE_MAX) {
SubgraphDefinition::Dependency arrival_dep;
arrival_dep.src_op_kind = SubgraphDefinition::OpKind::OPKIND_TASK;
arrival_dep.src_op_index = task_postcondition;
arrival_dep.src_op_port = 0;
arrival_dep.tgt_op_kind = SubgraphDefinition::OpKind::OPKIND_ARRIVAL;
arrival_dep.tgt_op_index = arrival_precondition;
arrival_dep.tgt_op_port = 0;
definition.dependencies.push_back(arrival_dep);
}
}
}
}
if (replayable) {
definition.concurrency_mode = SubgraphDefinition::ConcurrencyMode::INSTANTIATION_ORDER;
} else {
definition.concurrency_mode = SubgraphDefinition::ConcurrencyMode::ONE_SHOT;
}
return Subgraph::create_subgraph(subgraph, definition, ProfilingRequestSet());
}
static Event instantiate_subgraph(Subgraph &subgraph,
const Event &subgraph_ready,
const TaskGraph &graph, size_t graph_index,
long start_timestep, long stop_timestep,
long first_point, long last_point,
long num_fields,
bool force_copies,
std::vector<std::vector<std::vector<std::map<long, Barrier> > > > &raw_in,
std::vector<std::vector<std::vector<std::map<long, Barrier> > > > &war_in,
std::vector<std::vector<std::vector<std::map<long, Barrier> > > > &raw_out,
std::vector<std::vector<std::vector<std::map<long, Barrier> > > > &war_out,
const std::vector<std::vector<std::vector<std::vector<long> > > > &raw_points_not_in_dset,
const std::vector<std::vector<std::vector<std::vector<long> > > > &war_points_not_in_dset,
const std::vector<std::vector<std::vector<char *> > > &result_base)
{
DynamicBufferSerializer global_ser(4096); // FIXME: dynamic allocation
for (long timestep = start_timestep; timestep < stop_timestep; ++timestep) {
global_ser << timestep;
}
std::vector<Event> preconditions;
for (long timestep = start_timestep; timestep < stop_timestep; ++timestep) {
long dset = graph.dependence_set_at_timestep(timestep);
long next_dset = graph.dependence_set_at_timestep(timestep + 1);
long last_field_dset = graph.dependence_set_at_timestep(std::max(timestep - num_fields + 1, 0L));
// long offset = graph.offset_at_timestep(timestep);
// long width = graph.width_at_timestep(timestep);
// long last_offset = graph.offset_at_timestep(timestep-1);
// long last_width = graph.width_at_timestep(timestep-1);
long next_offset = graph.offset_at_timestep(timestep+1);
long next_width = graph.width_at_timestep(timestep+1);
long fid = FID_FIRST + timestep % num_fields;
long last_fid = FID_FIRST + (timestep + num_fields - 1) % num_fields;
for (long point = first_point; point <= last_point; ++point) {
// Gather inputs
for (auto interval : graph.dependencies(dset, point)) {
for (long dep = interval.first; dep <= interval.second; ++dep) {
Barrier &ready = raw_in.at(graph_index).at(point - first_point).at(last_fid - FID_FIRST).at(dep);
preconditions.push_back(ready.get_previous_phase());
}
}
// Dependencies can occur in one of two ways:
// 1. The dependent task is local, so copy is not necessary.
// (In this case the dependency catches on the task itself.)
// 2. The dependent task is non-local, so copy is necessary.
// (In this case the dependency catches on the copy.)
// WAR dependencies (part 1)
for (auto interval : graph.reverse_dependencies(last_field_dset, point)) {
for (long dep = interval.first; dep <= interval.second; ++dep) {
if (dep >= next_offset && dep < next_offset + next_width) {
// Only copy when the dependent task doesn't live in the same address space.
if (!force_copies && result_base.at(graph_index).at(dep).at(last_fid - FID_FIRST)) {
Barrier &ready = war_in.at(graph_index).at(point - first_point).at(fid - FID_FIRST).at(dep);
preconditions.push_back(ready.get_previous_phase());
}
}
}
}
// WAR dependencies (part 2)
for (auto interval : graph.reverse_dependencies(next_dset, point)) {
for (long dep = interval.first; dep <= interval.second; ++dep) {
if (dep >= next_offset && dep < next_offset + next_width) {
// Only copy when the dependent task doesn't live in the same address space.
if (force_copies || !result_base.at(graph_index).at(dep).at(last_fid - FID_FIRST)) {
Barrier &ready = war_in.at(graph_index).at(point - first_point).at(fid - FID_FIRST).at(dep);
preconditions.push_back(ready.get_previous_phase());
}
}
}
}
// Launch task
// Nothing to do, already completely described by subgraph and interpolations
// WAR dependencies (part 2)
// RAW dependencies
for (auto interval : graph.reverse_dependencies(next_dset, point)) {
for (long dep = interval.first; dep <= interval.second; ++dep) {
Barrier &complete = raw_out.at(graph_index).at(point - first_point).at(fid - FID_FIRST).at(dep);
global_ser << complete;
// Nothing to do, already completely described by subgraph and interpolations
}
}
// Also need to arrive at any points not included in this
// dset, otherwise we'll deadlock.
for (long dep : war_points_not_in_dset.at(graph_index).at(point - first_point).at(next_dset)) {
Barrier &barrier = raw_out.at(graph_index).at(point - first_point).at(fid - FID_FIRST).at(dep);
global_ser << barrier;
}
// WAR dependencies
for (auto interval : graph.dependencies(dset, point)) {
for (long dep = interval.first; dep <= interval.second; ++dep) {
Barrier &complete = war_out.at(graph_index).at(point - first_point).at(last_fid - FID_FIRST).at(dep);
global_ser << complete;
}
}
// Also need to arrive at any points not included in this
// dset, otherwise we'll deadlock.
for (long dep : raw_points_not_in_dset.at(graph_index).at(point - first_point).at(dset)) {
Barrier &barrier = war_out.at(graph_index).at(point - first_point).at(last_fid - FID_FIRST).at(dep);
global_ser << barrier;
}
for (auto &bar : raw_in.at(graph_index).at(point - first_point).at(fid - FID_FIRST)) {
bar.second = bar.second.advance_barrier();
}
for (auto &bar : raw_out.at(graph_index).at(point - first_point).at(fid - FID_FIRST)) {
bar.second = bar.second.advance_barrier();
}
for (auto &bar : war_in.at(graph_index).at(point - first_point).at(last_fid - FID_FIRST)) {
bar.second = bar.second.advance_barrier();
}
for (auto &bar : war_out.at(graph_index).at(point - first_point).at(last_fid - FID_FIRST)) {
bar.second = bar.second.advance_barrier();
}
}
}
std::vector<Event> postconditions;
return subgraph.instantiate(global_ser.get_buffer(), global_ser.bytes_used(),
ProfilingRequestSet(),
preconditions,
postconditions,
subgraph_ready);
}
void shard_task(const void *args, size_t arglen, const void *userdata,
size_t userlen, Processor p)
{
ShardArgs a;
std::vector<TaskGraph> graphs;
std::vector<std::vector<RegionInstance> > task_results;
std::vector<std::vector<RegionInstance> > task_inputs;
std::vector<std::vector<RegionInstance> > raw_exchange;
std::vector<std::vector<RegionInstance> > war_exchange;
{
FixedBufferDeserializer ser(args, arglen);
ser >> a;
ser >> graphs;
ser >> task_results;
ser >> task_inputs;
ser >> raw_exchange;
ser >> war_exchange;
assert(ser.bytes_left() == 0);
}
long proc_index = a.proc_index;
long num_procs = a.num_procs;
long num_fields = a.num_fields;
long force_copies = a.force_copies;
Memory sysmem = a.sysmem;
Memory regmem = a.regmem;
Barrier sync = a.sync;
Barrier first_start = a.first_start;
Barrier last_start = a.last_start;
Barrier first_stop = a.first_stop;
Barrier last_stop = a.last_stop;
// Figure out who we're going to be communicating with.
for (size_t graph_index = 0; graph_index < graphs.size(); ++graph_index) {
auto graph = graphs.at(graph_index);
long first_point = proc_index * graph.max_width / num_procs;
long last_point = (proc_index + 1) * graph.max_width / num_procs - 1;
for (long point = first_point; point <= last_point; ++point) {
task_results.at(graph_index).at(point).fetch_metadata(p).wait();
task_inputs.at(graph_index).at(point).fetch_metadata(p).wait();
raw_exchange.at(graph_index).at(point).fetch_metadata(p).wait();
war_exchange.at(graph_index).at(point).fetch_metadata(p).wait();
}
}
// graph -> point -> [remote point]
std::vector<std::vector<std::set<long> > > raw_exchange_points(graphs.size());
std::vector<std::vector<std::set<long> > > war_exchange_points(graphs.size());
// graph -> [remote point]
std::vector<std::set<long> > raw_all_points(graphs.size());
std::vector<std::set<long> > war_all_points(graphs.size());
for (size_t graph_index = 0; graph_index < graphs.size(); ++graph_index) {
auto graph = graphs.at(graph_index);
long first_point = proc_index * graph.max_width / num_procs;
long last_point = (proc_index + 1) * graph.max_width / num_procs - 1;
raw_exchange_points.at(graph_index).resize(last_point - first_point + 1);
war_exchange_points.at(graph_index).resize(last_point - first_point + 1);
for (long point = first_point; point <= last_point; ++point) {
long max_dset = graph.max_dependence_sets();
for (long dset = 0; dset < max_dset; ++dset) {
for (auto interval : graph.dependencies(dset, point)) {
for (long dep = interval.first; dep <= interval.second; ++dep) {
raw_exchange_points.at(graph_index).at(point - first_point).insert(dep);
raw_all_points.at(graph_index).insert(dep);
}
}
for (auto interval : graph.reverse_dependencies(dset, point)) {
for (long dep = interval.first; dep <= interval.second; ++dep) {
war_exchange_points.at(graph_index).at(point - first_point).insert(dep);
war_all_points.at(graph_index).insert(dep);
}
}
}
}
}
// graph -> point -> dset -> [remote point]
std::vector<std::vector<std::vector<std::vector<long> > > > raw_points_not_in_dset(graphs.size());
std::vector<std::vector<std::vector<std::vector<long> > > > war_points_not_in_dset(graphs.size());
for (size_t graph_index = 0; graph_index < graphs.size(); ++graph_index) {
auto graph = graphs.at(graph_index);
long first_point = proc_index * graph.max_width / num_procs;
long last_point = (proc_index + 1) * graph.max_width / num_procs - 1;
raw_points_not_in_dset.at(graph_index).resize(last_point - first_point + 1);
war_points_not_in_dset.at(graph_index).resize(last_point - first_point + 1);
for (long point = first_point; point <= last_point; ++point) {
long max_dset = graph.max_dependence_sets();
raw_points_not_in_dset.at(graph_index).at(point - first_point).resize(max_dset);
war_points_not_in_dset.at(graph_index).at(point - first_point).resize(max_dset);
for (long dset = 0; dset < max_dset; ++dset) {
std::set<long> raw_points = raw_exchange_points.at(graph_index).at(point - first_point);
std::set<long> war_points = war_exchange_points.at(graph_index).at(point - first_point);
for (auto interval : graph.dependencies(dset, point)) {
for (long dep = interval.first; dep <= interval.second; ++dep) {
raw_points.erase(dep);
}
}
for (auto interval : graph.reverse_dependencies(dset, point)) {
for (long dep = interval.first; dep <= interval.second; ++dep) {
war_points.erase(dep);
}
}
raw_points_not_in_dset.at(graph_index).at(point - first_point).at(dset).assign(raw_points.begin(), raw_points.end());
war_points_not_in_dset.at(graph_index).at(point - first_point).at(dset).assign(war_points.begin(), war_points.end());
}
}
}
// Create local input regions.
// graph -> point -> max deps
std::vector<std::vector<long> > max_deps(graphs.size());
long all_max_deps = 0;
for (size_t graph_index = 0; graph_index < graphs.size(); ++graph_index) {
auto graph = graphs.at(graph_index);
max_deps.at(graph_index).resize(graph.max_width, 0);
for (long point = 0; point < graph.max_width; ++point) {
long max_dset = graph.max_dependence_sets();
for (long dset = 0; dset < max_dset; ++dset) {
long deps = 0;
for (auto interval : graph.dependencies(dset, point)) {
deps += interval.second - interval.first + 1;
}
max_deps.at(graph_index).at(point) = std::max(max_deps.at(graph_index).at(point), deps);
all_max_deps = std::max(all_max_deps, deps);
}
}
}
// graph -> point -> dep -> instance
std::vector<std::vector<std::vector<RegionInstance> > > inputs(graphs.size());
// graph -> point -> dep -> field -> base pointer
std::vector<std::vector<std::vector<std::vector<char *> > > > input_base(graphs.size());
for (size_t graph_index = 0; graph_index < graphs.size(); ++graph_index) {
auto graph = graphs.at(graph_index);
Rect1 bounds(Point1(0), Point1(graph.output_bytes_per_task - 1));
std::map<FieldID, size_t> field_sizes;
for (unsigned fid = FID_FIRST; fid < FID_FIRST + num_fields; ++fid) {
field_sizes[fid] = sizeof(char);
}
long first_point = proc_index * graph.max_width / num_procs;
long last_point = (proc_index + 1) * graph.max_width / num_procs - 1;
inputs.at(graph_index).resize(last_point - first_point + 1);
input_base.at(graph_index).resize(last_point - first_point + 1);
for (long point = first_point; point <= last_point; ++point) {
long deps = max_deps.at(graph_index).at(point);
inputs.at(graph_index).at(point - first_point).resize(deps);
input_base.at(graph_index).at(point - first_point).resize(deps);
AffineAccessor<RegionInstance, 1, coord_t> task_input =
AffineAccessor<RegionInstance, 1, coord_t>(task_inputs.at(graph_index).at(point), FID_FIRST);
for (long dep = 0; dep < deps; ++dep) {
RegionInstance &inst = inputs.at(graph_index).at(point - first_point).at(dep);
RegionInstance::create_instance(inst, regmem, bounds, field_sizes,
0 /*SOA*/, ProfilingRequestSet())
.wait();
input_base.at(graph_index).at(point - first_point).at(dep).resize(num_fields);
for (long fid = FID_FIRST; fid < FID_FIRST + num_fields; ++fid) {
input_base.at(graph_index).at(point - first_point).at(dep).at(fid - FID_FIRST) =
get_base(inst, fid);
}
task_input[dep] = inst;
}
for (long dep = deps; dep < all_max_deps; ++dep) {
task_input[dep] = RegionInstance::NO_INST;
}
}
}
// Create barriers.
// graph -> point -> field -> remote point -> barrier
std::vector<std::vector<std::vector<std::map<long, Barrier> > > > raw_in(graphs.size());
std::vector<std::vector<std::vector<std::map<long, Barrier> > > > war_in(graphs.size());
for (size_t graph_index = 0; graph_index < graphs.size(); ++graph_index) {
auto graph = graphs.at(graph_index);
long first_point = proc_index * graph.max_width / num_procs;
long last_point = (proc_index + 1) * graph.max_width / num_procs - 1;
raw_in.at(graph_index).resize(last_point - first_point + 1);
war_in.at(graph_index).resize(last_point - first_point + 1);
for (long point = first_point; point <= last_point; ++point) {
auto &raw_points = raw_exchange_points.at(graph_index).at(point - first_point);
auto &war_points = war_exchange_points.at(graph_index).at(point - first_point);
raw_in.at(graph_index).at(point - first_point).resize(num_fields);
war_in.at(graph_index).at(point - first_point).resize(num_fields);
for (long fid = FID_FIRST; fid < FID_FIRST + num_fields; ++fid) {
const Barrier no_barrier = Barrier::NO_BARRIER;
fill(raw_exchange.at(graph_index).at(point), fid,
&no_barrier, sizeof(no_barrier), Event::NO_EVENT)
.wait();
fill(war_exchange.at(graph_index).at(point), fid,
&no_barrier, sizeof(no_barrier), Event::NO_EVENT)
.wait();
AffineAccessor<Barrier, 1, coord_t> raw =
AffineAccessor<Barrier, 1, coord_t>(raw_exchange.at(graph_index).at(point), fid);
AffineAccessor<Barrier, 1, coord_t> war =
AffineAccessor<Barrier, 1, coord_t>(war_exchange.at(graph_index).at(point), fid);
for (auto dep : raw_points) {
Barrier bar = Barrier::create_barrier(1);
raw_in.at(graph_index).at(point - first_point).at(fid - FID_FIRST)[dep] = bar;
raw[dep] = bar;
}
for (auto dep : war_points) {
Barrier bar = Barrier::create_barrier(1);
war_in.at(graph_index).at(point - first_point).at(fid - FID_FIRST)[dep] = bar;
war[dep] = bar;
}
}
}
}
// Perform input region/barrier exchange.
sync.arrive(1);