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[EM] Avoid synchronous calls and unnecessary ATS access. (#10811)

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- Pass context into various functions.
- Factor out some CUDA algorithms.
- Use ATS only for update position.
This commit is contained in:
Jiaming Yuan
2024-09-10 14:33:14 +08:00
committed by GitHub
parent ed5f33df16
commit d94f6679fc
16 changed files with 161 additions and 201 deletions
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16
tests/cpp/common/test_threading_utils.cu
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@@ -1,16 +1,17 @@
/**
* Copyright 2021-2023 by XGBoost Contributors
* Copyright 2021-2024, XGBoost Contributors
*/
#include <gtest/gtest.h>
#include <thrust/copy.h> // thrust::copy
#include "../../../src/common/device_helpers.cuh"
#include "../../../src/common/threading_utils.cuh"
#include "../helpers.h" // for MakeCUDACtx
namespace xgboost {
namespace common {
namespace xgboost::common {
TEST(SegmentedTrapezoidThreads, Basic) {
size_t constexpr kElements = 24, kGroups = 3;
auto ctx = MakeCUDACtx(0);
dh::device_vector<size_t> offset_ptr(kGroups + 1, 0);
offset_ptr[0] = 0;
offset_ptr[1] = 8;
@@ -19,11 +20,11 @@ TEST(SegmentedTrapezoidThreads, Basic) {
size_t h = 1;
dh::device_vector<size_t> thread_ptr(kGroups + 1, 0);
size_t total = SegmentedTrapezoidThreads(dh::ToSpan(offset_ptr), dh::ToSpan(thread_ptr), h);
size_t total = SegmentedTrapezoidThreads(&ctx, dh::ToSpan(offset_ptr), dh::ToSpan(thread_ptr), h);
ASSERT_EQ(total, kElements - kGroups);
h = 2;
SegmentedTrapezoidThreads(dh::ToSpan(offset_ptr), dh::ToSpan(thread_ptr), h);
SegmentedTrapezoidThreads(&ctx, dh::ToSpan(offset_ptr), dh::ToSpan(thread_ptr), h);
std::vector<size_t> h_thread_ptr(thread_ptr.size());
thrust::copy(thread_ptr.cbegin(), thread_ptr.cend(), h_thread_ptr.begin());
for (size_t i = 1; i < h_thread_ptr.size(); ++i) {
@@ -31,7 +32,7 @@ TEST(SegmentedTrapezoidThreads, Basic) {
}
h = 7;
SegmentedTrapezoidThreads(dh::ToSpan(offset_ptr), dh::ToSpan(thread_ptr), h);
SegmentedTrapezoidThreads(&ctx, dh::ToSpan(offset_ptr), dh::ToSpan(thread_ptr), h);
thrust::copy(thread_ptr.cbegin(), thread_ptr.cend(), h_thread_ptr.begin());
for (size_t i = 1; i < h_thread_ptr.size(); ++i) {
ASSERT_EQ(h_thread_ptr[i] - h_thread_ptr[i - 1], 28);
@@ -66,5 +67,4 @@ TEST(SegmentedTrapezoidThreads, Unravel) {
ASSERT_EQ(i, 6);
ASSERT_EQ(j, 7);
}
} // namespace common
} // namespace xgboost
} // namespace xgboost::common