LLVM Clang 3.2 Loop Vectorizer

Intel Core i7-3960X testing of the automatic loop vectorizer in LLVM 3.2 with the Clang compiler. Benchmarking by Michael Larabel for a future article on phoronix.com.

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October 26 2012
 
Loop Vectorization
October 26 2012
 
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LLVM Clang 3.2 Loop VectorizerOpenBenchmarking.orgPhoronix Test Suite 10.6.0Intel Core i7-3960X @ 3.30GHz (12 Cores)Intel DX79SIIntel Xeon E5/Core8192MB64GB OCZ VERTEXAMD Radeon HD 4650 512MBRealtek ALC892DELL S2409WIntel 82579LM Gigabit ConnectionUbuntu 12.103.5.0-17-generic (x86_64)Unity 6.8.0X Server 1.13.0radeon 6.99.992.1 Mesa 9.0 Gallium 0.4Clang 3.2 (SVN 166775) + LLVM 3.2svnext41920x1080ProcessorMotherboardChipsetMemoryDiskGraphicsAudioMonitorNetworkOSKernelDesktopDisplay ServerDisplay DriverOpenGLCompilerFile-SystemScreen ResolutionLLVM Clang 3.2 Loop Vectorizer BenchmarksSystem Logs- Optimized build; Built Oct 26 2012 (10:29:50); Default target: x86_64-unknown-linux-gnu; Host CPU: corei7-avx - Scaling Governor: ondemand- Compiz was running on this system.

Default vs. Loop Vectorization ComparisonPhoronix Test Suite 10.6.0Baseline+30%+30%+60%+60%+90%+90%+120%+120%3.7%L.A.T120%Blur12.3%Total Time10.7%Resizing6%T.B.T.P.SP.P.S2.6%G.I.R.1.S2.6%GraphicsMagickGraphicsMagickC-RayGraphicsMagickPostgreSQL pgbenchHimeno BenchmarkSmallptDefaultLoop Vectorization

LLVM Clang 3.2 Loop Vectorizerhmmer: Pfam Database Searchgraphics-magick: Blurgraphics-magick: Sharpengraphics-magick: Resizinggraphics-magick: HWB Color Spacegraphics-magick: Local Adaptive Thresholdinghimeno: Poisson Pressure Solverc-ray: Total Timesmallpt: Global Illumination Renderer; 100 Samplespgbench: TPC-B Transactions Per SecondDefaultLoop Vectorization15.35823189123441595.3520.92153324.7715.37733184122201554.6623.15157336.65OpenBenchmarking.org

Timed HMMer Search

This test searches through the Pfam database of profile hidden markov models. The search finds the domain structure of Drosophila Sevenless protein. Learn more via the OpenBenchmarking.org test page.

OpenBenchmarking.orgSeconds, Fewer Is BetterTimed HMMer Search 2.3.2Pfam Database SearchDefaultLoop Vectorization48121620SE +/- 0.05, N = 3SE +/- 0.02, N = 315.3515.37-mllvm -vectorize1. (CC) gcc options: -O3 -march=native -pthread -lhmmer -lsquid -lm
OpenBenchmarking.orgSeconds, Fewer Is BetterTimed HMMer Search 2.3.2Pfam Database SearchDefaultLoop Vectorization48121620Min: 15.29 / Avg: 15.35 / Max: 15.46Min: 15.35 / Avg: 15.37 / Max: 15.411. (CC) gcc options: -O3 -march=native -pthread -lhmmer -lsquid -lm

GraphicsMagick

OpenBenchmarking.orgIterations Per Minute, More Is BetterGraphicsMagick 1.3.16Operation: BlurDefaultLoop Vectorization20406080100SE +/- 0.00, N = 3SE +/- 0.00, N = 38273-mllvm -vectorize -lpng121. (CC) gcc options: -O3 -march=native -pthread -lXext -lX11 -lz -lm -lpthread
OpenBenchmarking.orgIterations Per Minute, More Is BetterGraphicsMagick 1.3.16Operation: BlurDefaultLoop Vectorization1632486480Min: 82 / Avg: 82 / Max: 82Min: 73 / Avg: 73 / Max: 731. (CC) gcc options: -O3 -march=native -pthread -lXext -lX11 -lz -lm -lpthread

OpenBenchmarking.orgIterations Per Minute, More Is BetterGraphicsMagick 1.3.16Operation: SharpenDefaultLoop Vectorization714212835SE +/- 0.00, N = 3SE +/- 0.00, N = 33131-mllvm -vectorize -lpng121. (CC) gcc options: -O3 -march=native -pthread -lXext -lX11 -lz -lm -lpthread
OpenBenchmarking.orgIterations Per Minute, More Is BetterGraphicsMagick 1.3.16Operation: SharpenDefaultLoop Vectorization714212835Min: 31 / Avg: 31 / Max: 31Min: 31 / Avg: 31 / Max: 311. (CC) gcc options: -O3 -march=native -pthread -lXext -lX11 -lz -lm -lpthread

OpenBenchmarking.orgIterations Per Minute, More Is BetterGraphicsMagick 1.3.16Operation: ResizingDefaultLoop Vectorization20406080100SE +/- 0.00, N = 3SE +/- 0.00, N = 38984-mllvm -vectorize -lpng121. (CC) gcc options: -O3 -march=native -pthread -lXext -lX11 -lz -lm -lpthread
OpenBenchmarking.orgIterations Per Minute, More Is BetterGraphicsMagick 1.3.16Operation: ResizingDefaultLoop Vectorization20406080100Min: 89 / Avg: 89 / Max: 89Min: 84 / Avg: 84 / Max: 841. (CC) gcc options: -O3 -march=native -pthread -lXext -lX11 -lz -lm -lpthread

OpenBenchmarking.orgIterations Per Minute, More Is BetterGraphicsMagick 1.3.16Operation: HWB Color SpaceDefaultLoop Vectorization306090120150SE +/- 0.00, N = 3SE +/- 0.33, N = 3123122-mllvm -vectorize -lpng121. (CC) gcc options: -O3 -march=native -pthread -lXext -lX11 -lz -lm -lpthread
OpenBenchmarking.orgIterations Per Minute, More Is BetterGraphicsMagick 1.3.16Operation: HWB Color SpaceDefaultLoop Vectorization20406080100Min: 123 / Avg: 123 / Max: 123Min: 121 / Avg: 121.67 / Max: 1221. (CC) gcc options: -O3 -march=native -pthread -lXext -lX11 -lz -lm -lpthread

OpenBenchmarking.orgIterations Per Minute, More Is BetterGraphicsMagick 1.3.16Operation: Local Adaptive ThresholdingDefaultLoop Vectorization1020304050SE +/- 0.00, N = 3SE +/- 0.00, N = 34420-mllvm -vectorize -lpng121. (CC) gcc options: -O3 -march=native -pthread -lXext -lX11 -lz -lm -lpthread
OpenBenchmarking.orgIterations Per Minute, More Is BetterGraphicsMagick 1.3.16Operation: Local Adaptive ThresholdingDefaultLoop Vectorization918273645Min: 44 / Avg: 44 / Max: 44Min: 20 / Avg: 20 / Max: 201. (CC) gcc options: -O3 -march=native -pthread -lXext -lX11 -lz -lm -lpthread

Himeno Benchmark

The Himeno benchmark is a linear solver of pressure Poisson using a point-Jacobi method. Learn more via the OpenBenchmarking.org test page.

OpenBenchmarking.orgMFLOPS, More Is BetterHimeno Benchmark 3.0Poisson Pressure SolverDefaultLoop Vectorization30060090012001500SE +/- 3.05, N = 3SE +/- 6.98, N = 31595.351554.66-mllvm -vectorize1. (CC) gcc options: -O3 -march=native
OpenBenchmarking.orgMFLOPS, More Is BetterHimeno Benchmark 3.0Poisson Pressure SolverDefaultLoop Vectorization30060090012001500Min: 1589.3 / Avg: 1595.35 / Max: 1599.03Min: 1542.56 / Avg: 1554.66 / Max: 1566.741. (CC) gcc options: -O3 -march=native

C-Ray

This is a test of C-Ray, a simple raytracer designed to test the floating-point CPU performance. This test is multi-threaded (16 threads per core), will shoot 8 rays per pixel for anti-aliasing, and will generate a 1600 x 1200 image. Learn more via the OpenBenchmarking.org test page.

OpenBenchmarking.orgSeconds, Fewer Is BetterC-Ray 1.1Total TimeDefaultLoop Vectorization612182430SE +/- 0.03, N = 3SE +/- 0.04, N = 320.9223.15-mllvm -vectorize1. (CC) gcc options: -lm -lpthread -O3 -march=native
OpenBenchmarking.orgSeconds, Fewer Is BetterC-Ray 1.1Total TimeDefaultLoop Vectorization510152025Min: 20.89 / Avg: 20.92 / Max: 20.97Min: 23.11 / Avg: 23.15 / Max: 23.231. (CC) gcc options: -lm -lpthread -O3 -march=native

Smallpt

Smallpt is a C++ global illumination renderer written in less than 100 lines of code. Global illumination is done via unbiased Monte Carlo path tracing and there is multi-threading support via the OpenMP library. Learn more via the OpenBenchmarking.org test page.

OpenBenchmarking.orgSeconds, Fewer Is BetterSmallpt 1.0Global Illumination Renderer; 100 SamplesDefaultLoop Vectorization306090120150SE +/- 0.33, N = 3SE +/- 0.33, N = 3153157-mllvm -vectorize1. (CXX) g++ options: -fopenmp -O3 -march=native
OpenBenchmarking.orgSeconds, Fewer Is BetterSmallpt 1.0Global Illumination Renderer; 100 SamplesDefaultLoop Vectorization306090120150Min: 152 / Avg: 152.67 / Max: 153Min: 157 / Avg: 157.33 / Max: 1581. (CXX) g++ options: -fopenmp -O3 -march=native

PostgreSQL pgbench

OpenBenchmarking.orgTPS, More Is BetterPostgreSQL pgbench 8.4.11TPC-B Transactions Per SecondDefaultLoop Vectorization70140210280350SE +/- 0.52, N = 3SE +/- 3.97, N = 3324.77336.65-mllvm -vectorize1. (CC) gcc options: -O3 -march=native -fno-strict-aliasing -fwrapv -lpgport -lpq -lcrypt -ldl -lm
OpenBenchmarking.orgTPS, More Is BetterPostgreSQL pgbench 8.4.11TPC-B Transactions Per SecondDefaultLoop Vectorization60120180240300Min: 324.06 / Avg: 324.77 / Max: 325.79Min: 332.05 / Avg: 336.65 / Max: 344.551. (CC) gcc options: -O3 -march=native -fno-strict-aliasing -fwrapv -lpgport -lpq -lcrypt -ldl -lm