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Simd Find #6302

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Simd Find #6302

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Johan511
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using simd-helpers (from #6286 ) to add vectorization to stl algorithms

@@ -34,8 +34,7 @@ namespace hpx::parallel::detail {
sequential_find_t<ExPolicy>, Iterator first, Sentinel last,
T const& value, Proj proj = Proj())
{
return util::loop_pred<
std::decay_t<hpx::execution::sequenced_policy>>(
return util::loop_pred<ExPolicy>(
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Could you add static_assert verifying that ExPolicy is actually a sequential policy?

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Change had been made so sequential_find_t can accept sequential and unsequential execution policies. Do you want me to rather use static_assert(is_seq || is_unseq) ?

/*
Compiler and Hardware should also support vector operations for IterDiff,
else we see slower performance when compared to sequential version
*/
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What does this comment mean? Should that requirement be somehow enforced?

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As discussed previously, changing data types can lead to vectorization being broken. I wanted to leave a note for the future regarding it. Use perf regression tests might not be the best way to do this as they often seem to have lot of variance in them.

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Well, a comment doesn't help with this, does it? I think setting up performance tests would be the better option. @Pansysk75 can help with that.

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@Pansysk75 Pansysk75 Aug 8, 2023

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@hkaiser Do you mean automated ones that report on GH? He asked me about this but I discouraged him from doing that yet. It can certainly be done though, if that's what you have in mind
@Johan511 There are ways of getting around that variance, so that (hopefully) wont be a probem.

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Well, I thought we could add it to our performance tests.

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@Johan511 Johan511 Aug 18, 2023

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added it in a separate PR

libs/core/algorithms/include/hpx/parallel/util/loop.hpp Outdated Show resolved Hide resolved
libs/core/algorithms/include/hpx/parallel/util/loop.hpp Outdated Show resolved Hide resolved
libs/core/algorithms/include/hpx/parallel/util/loop.hpp Outdated Show resolved Hide resolved
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Johan511 commented Aug 8, 2023

first-simd
Speedups observed for seq vs unseq

@hkaiser
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hkaiser commented Aug 8, 2023

Speedups observed for seq vs unseq

Nice!

@StellarBot
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Performance test report

HPX Performance

Comparison

BENCHMARKFORK_JOIN_EXECUTORPARALLEL_EXECUTORSCHEDULER_EXECUTOR
For Each(=)??-

Info

PropertyBeforeAfter
HPX Datetime2023-05-10T12:07:53+00:002023-08-08T21:21:49+00:00
HPX Commitdcb5415f524d6e
Clusternamerostamrostam
Datetime2023-05-10T14:50:18.616050-05:002023-08-08T16:30:27.710089-05:00
Hostnamemedusa08.rostam.cct.lsu.edumedusa08.rostam.cct.lsu.edu
Compiler/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1
Envfile

Comparison

BENCHMARKNO-EXECUTOR
Future Overhead - Create Thread Hierarchical - Latch=

Info

PropertyBeforeAfter
HPX Datetime2023-05-10T12:07:53+00:002023-08-08T21:21:49+00:00
HPX Commitdcb5415f524d6e
Clusternamerostamrostam
Datetime2023-05-10T14:52:35.047119-05:002023-08-08T16:32:40.990850-05:00
Hostnamemedusa08.rostam.cct.lsu.edumedusa08.rostam.cct.lsu.edu
Compiler/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1
Envfile

Comparison

BENCHMARKFORK_JOIN_EXECUTOR_DEFAULT_FORK_JOIN_POLICY_ALLOCATORPARALLEL_EXECUTOR_DEFAULT_PARALLEL_POLICY_ALLOCATORSCHEDULER_EXECUTOR_DEFAULT_SCHEDULER_EXECUTOR_ALLOCATOR
Stream Benchmark - Add(=)(=)(=)
Stream Benchmark - Scale(=)(=)(=)
Stream Benchmark - Triad(=)(=)(=)
Stream Benchmark - Copy(=)(=)(=)

Info

PropertyBeforeAfter
HPX Datetime2023-05-10T12:07:53+00:002023-08-08T21:21:49+00:00
HPX Commitdcb5415f524d6e
Clusternamerostamrostam
Datetime2023-05-10T14:52:52.237641-05:002023-08-08T16:32:57.921975-05:00
Hostnamemedusa08.rostam.cct.lsu.edumedusa08.rostam.cct.lsu.edu
Compiler/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1
Envfile

Explanation of Symbols

SymbolMEANING
=No performance change (confidence interval within ±1%)
(=)Probably no performance change (confidence interval within ±2%)
(+)/(-)Very small performance improvement/degradation (≤1%)
+/-Small performance improvement/degradation (≤5%)
++/--Large performance improvement/degradation (≤10%)
+++/---Very large performance improvement/degradation (>10%)
?Probably no change, but quite large uncertainty (confidence interval with ±5%)
??Unclear result, very large uncertainty (±10%)
???Something unexpected…

@StellarBot
Copy link

Performance test report

HPX Performance

Comparison

BENCHMARKFORK_JOIN_EXECUTORPARALLEL_EXECUTORSCHEDULER_EXECUTOR
For Each(=)??-

Info

PropertyBeforeAfter
HPX Datetime2023-05-10T12:07:53+00:002023-08-08T21:33:54+00:00
HPX Commitdcb5415f663f52
Datetime2023-05-10T14:50:18.616050-05:002023-08-08T16:40:03.129538-05:00
Clusternamerostamrostam
Hostnamemedusa08.rostam.cct.lsu.edumedusa08.rostam.cct.lsu.edu
Envfile
Compiler/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1

Comparison

BENCHMARKNO-EXECUTOR
Future Overhead - Create Thread Hierarchical - Latch(=)

Info

PropertyBeforeAfter
HPX Datetime2023-05-10T12:07:53+00:002023-08-08T21:33:54+00:00
HPX Commitdcb5415f663f52
Datetime2023-05-10T14:52:35.047119-05:002023-08-08T16:42:16.273814-05:00
Clusternamerostamrostam
Hostnamemedusa08.rostam.cct.lsu.edumedusa08.rostam.cct.lsu.edu
Envfile
Compiler/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1

Comparison

BENCHMARKFORK_JOIN_EXECUTOR_DEFAULT_FORK_JOIN_POLICY_ALLOCATORPARALLEL_EXECUTOR_DEFAULT_PARALLEL_POLICY_ALLOCATORSCHEDULER_EXECUTOR_DEFAULT_SCHEDULER_EXECUTOR_ALLOCATOR
Stream Benchmark - Add(=)(=)(=)
Stream Benchmark - Scale(=)(=)(=)
Stream Benchmark - Triad(=)(=)(=)
Stream Benchmark - Copy(=)(=)(=)

Info

PropertyBeforeAfter
HPX Datetime2023-05-10T12:07:53+00:002023-08-08T21:33:54+00:00
HPX Commitdcb5415f663f52
Datetime2023-05-10T14:52:52.237641-05:002023-08-08T16:42:33.204088-05:00
Clusternamerostamrostam
Hostnamemedusa08.rostam.cct.lsu.edumedusa08.rostam.cct.lsu.edu
Envfile
Compiler/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1

Explanation of Symbols

SymbolMEANING
=No performance change (confidence interval within ±1%)
(=)Probably no performance change (confidence interval within ±2%)
(+)/(-)Very small performance improvement/degradation (≤1%)
+/-Small performance improvement/degradation (≤5%)
++/--Large performance improvement/degradation (≤10%)
+++/---Very large performance improvement/degradation (>10%)
?Probably no change, but quite large uncertainty (confidence interval with ±5%)
??Unclear result, very large uncertainty (±10%)
???Something unexpected…

@StellarBot
Copy link

Performance test report

HPX Performance

Comparison

BENCHMARKFORK_JOIN_EXECUTORPARALLEL_EXECUTORSCHEDULER_EXECUTOR
For Each(=)??-

Info

PropertyBeforeAfter
HPX Datetime2023-05-10T12:07:53+00:002023-08-09T06:33:19+00:00
HPX Commitdcb541517aba85
Clusternamerostamrostam
Compiler/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1
Hostnamemedusa08.rostam.cct.lsu.edumedusa08.rostam.cct.lsu.edu
Datetime2023-05-10T14:50:18.616050-05:002023-08-09T01:40:37.750853-05:00
Envfile

Comparison

BENCHMARKNO-EXECUTOR
Future Overhead - Create Thread Hierarchical - Latch(=)

Info

PropertyBeforeAfter
HPX Datetime2023-05-10T12:07:53+00:002023-08-09T06:33:19+00:00
HPX Commitdcb541517aba85
Clusternamerostamrostam
Compiler/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1
Hostnamemedusa08.rostam.cct.lsu.edumedusa08.rostam.cct.lsu.edu
Datetime2023-05-10T14:52:35.047119-05:002023-08-09T01:42:50.859516-05:00
Envfile

Comparison

BENCHMARKFORK_JOIN_EXECUTOR_DEFAULT_FORK_JOIN_POLICY_ALLOCATORPARALLEL_EXECUTOR_DEFAULT_PARALLEL_POLICY_ALLOCATORSCHEDULER_EXECUTOR_DEFAULT_SCHEDULER_EXECUTOR_ALLOCATOR
Stream Benchmark - Add(=)(=)(=)
Stream Benchmark - Scale(=)(=)(=)
Stream Benchmark - Triad=(=)(=)
Stream Benchmark - Copy(=)(=)(=)

Info

PropertyBeforeAfter
HPX Datetime2023-05-10T12:07:53+00:002023-08-09T06:33:19+00:00
HPX Commitdcb541517aba85
Clusternamerostamrostam
Compiler/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1
Hostnamemedusa08.rostam.cct.lsu.edumedusa08.rostam.cct.lsu.edu
Datetime2023-05-10T14:52:52.237641-05:002023-08-09T01:43:07.824650-05:00
Envfile

Explanation of Symbols

SymbolMEANING
=No performance change (confidence interval within ±1%)
(=)Probably no performance change (confidence interval within ±2%)
(+)/(-)Very small performance improvement/degradation (≤1%)
+/-Small performance improvement/degradation (≤5%)
++/--Large performance improvement/degradation (≤10%)
+++/---Very large performance improvement/degradation (>10%)
?Probably no change, but quite large uncertainty (confidence interval with ±5%)
??Unclear result, very large uncertainty (±10%)
???Something unexpected…

@hkaiser
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hkaiser commented Aug 9, 2023

@Johan511 could you please fix the reported clang-format issues as well?

@Johan511
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Johan511 commented Aug 9, 2023

@Johan511 could you please fix the reported clang-format issues as well?

There is one loop yet to be vectorized, once that's done vectorization should be enabled for parallel case too. We can merge after that.

@StellarBot
Copy link

Performance test report

HPX Performance

Comparison

BENCHMARKFORK_JOIN_EXECUTORPARALLEL_EXECUTORSCHEDULER_EXECUTOR
For Each(=)??-

Info

PropertyBeforeAfter
HPX Datetime2023-05-10T12:07:53+00:002023-08-11T12:14:49+00:00
HPX Commitdcb54155cccf76
Datetime2023-05-10T14:50:18.616050-05:002023-08-11T07:20:22.167797-05:00
Compiler/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1
Envfile
Clusternamerostamrostam
Hostnamemedusa08.rostam.cct.lsu.edumedusa08.rostam.cct.lsu.edu

Comparison

BENCHMARKNO-EXECUTOR
Future Overhead - Create Thread Hierarchical - Latch(=)

Info

PropertyBeforeAfter
HPX Datetime2023-05-10T12:07:53+00:002023-08-11T12:14:49+00:00
HPX Commitdcb54155cccf76
Datetime2023-05-10T14:52:35.047119-05:002023-08-11T07:22:34.867171-05:00
Compiler/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1
Envfile
Clusternamerostamrostam
Hostnamemedusa08.rostam.cct.lsu.edumedusa08.rostam.cct.lsu.edu

Comparison

BENCHMARKFORK_JOIN_EXECUTOR_DEFAULT_FORK_JOIN_POLICY_ALLOCATORPARALLEL_EXECUTOR_DEFAULT_PARALLEL_POLICY_ALLOCATORSCHEDULER_EXECUTOR_DEFAULT_SCHEDULER_EXECUTOR_ALLOCATOR
Stream Benchmark - Add(=)(=)(=)
Stream Benchmark - Scale(=)(=)=
Stream Benchmark - Triad=(=)(=)
Stream Benchmark - Copy(=)-(=)

Info

PropertyBeforeAfter
HPX Datetime2023-05-10T12:07:53+00:002023-08-11T12:14:49+00:00
HPX Commitdcb54155cccf76
Datetime2023-05-10T14:52:52.237641-05:002023-08-11T07:22:51.879951-05:00
Compiler/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1
Envfile
Clusternamerostamrostam
Hostnamemedusa08.rostam.cct.lsu.edumedusa08.rostam.cct.lsu.edu

Explanation of Symbols

SymbolMEANING
=No performance change (confidence interval within ±1%)
(=)Probably no performance change (confidence interval within ±2%)
(+)/(-)Very small performance improvement/degradation (≤1%)
+/-Small performance improvement/degradation (≤5%)
++/--Large performance improvement/degradation (≤10%)
+++/---Very large performance improvement/degradation (>10%)
?Probably no change, but quite large uncertainty (confidence interval with ±5%)
??Unclear result, very large uncertainty (±10%)
???Something unexpected…

@Johan511
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@hkaiser the unseq_first_n function has been changed a bit, the the function now takes iterator as input instead of value, this does not break vectorization.

Hari Hara Naveen S and others added 6 commits February 8, 2024 14:11
Signed-off-by: Hari Hara Naveen S <johan511@rostam1.rostam.cct.lsu.edu>
Signed-off-by: Hari Hara Naveen S <johan511@rostam1.rostam.cct.lsu.edu>

changing test according to change made to helper

Signed-off-by: Hari Hara Naveen S <harihara.sn@gmail.com>
Signed-off-by: Hari Hara Naveen S <harihara.sn@gmail.com>

unseq

Signed-off-by: Hari Hara Naveen S <harihara.sn@gmail.com>
…for function call deduction)

Signed-off-by: Hari Hara Naveen S <harihara.sn@gmail.com>
Signed-off-by: Hari Hara Naveen S <harihara.sn@gmail.com>
Signed-off-by: Hari Hara Naveen S <harihara.sn@gmail.com>

fixed expolicy not accepting par_unseq

Signed-off-by: Hari Hara Naveen S <harihara.sn@gmail.com>

cleanup changes

Signed-off-by: Hari Hara Naveen S <harihara.sn@gmail.com>

fixing missing concept header

Signed-off-by: Hari Hara Naveen S <harihara.sn@gmail.com>
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Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation Diff coverage
-0.10% 80.00%
Coverage variation details
Coverable lines Covered lines Coverage
Common ancestor commit (17bdd0d) 206733 176202 85.23%
Head commit (d8096f0) 190774 (-15959) 162418 (-13784) 85.14% (-0.10%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details
Coverable lines Covered lines Diff coverage
Pull request (#6302) 10 8 80.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

See your quality gate settings    Change summary preferences

You may notice some variations in coverage metrics with the latest Coverage engine update. For more details, visit the documentation

@hkaiser hkaiser modified the milestones: 1.10.0, 1.11.0 May 3, 2024
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