OpenMP Compiler GCC Clang A Compiler comparison by Michael Larabel looking at the OpenMP LLVM Clang performance against GCC. Using Intel's Clang LLVM Compiler-RT and Intel OpenMP Runtime Library code on Ubuntu Linux. Benchmarks for a future article on Phoronix.com. Also a few other non-OMP benchmarks in this result file...
HTML result view exported from: https://openbenchmarking.org/result/1405255-PTS-OPENMPCO89 .
OpenMP Compiler GCC Clang Processor Motherboard Chipset Memory Disk Graphics Audio Network OS Kernel Desktop Display Server Display Driver OpenGL Compiler File-System Screen Resolution GCC 4.9.0 Clang 3.4 Stock Clang 3.4 Intel OpenMP Intel Core i7-3517U @ 1.90GHz (4 Cores) ASUS UX32VDA v1.0 Intel 3rd Gen Core DRAM 4096MB 2 x 128GB SanDisk SD5SF212 Intel HD 4000 512MB (1150MHz) Realtek ALC269VB Intel Centrino Advanced-N 6235 Ubuntu 14.04 3.13.0-24-generic (x86_64) Unity 7.2.0 X Server 1.15.1 intel 2.99.910 3.3 Mesa 10.1.0 GCC 4.9.0 ext4 1920x1080 Clang 3.4-1ubuntu3 Clang 3.4 + LLVM 3.4 OpenBenchmarking.org Compiler Details - GCC 4.9.0: --build=x86_64-linux-gnu --disable-browser-plugin --disable-libmudflap --disable-werror --enable-checking=release --enable-clocale=gnu --enable-gnu-unique-object --enable-gtk-cairo --enable-java-awt=gtk --enable-java-home --enable-languages=c,c++,java,go,fortran,objc,obj-c++ --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-multiarch --enable-multilib --enable-nls --enable-objc-gc --enable-plugin --enable-shared --enable-threads=posix --host=x86_64-linux-gnu --target=x86_64-linux-gnu --with-abi=m64 --with-arch-32=i686 --with-arch-directory=amd64 --with-multilib-list=m32,m64,mx32 --with-tune=generic -v - Clang 3.4 Intel OpenMP: Optimized build; Built May 25 2014 (09:24:01); Default target: x86_64-unknown-linux-gnu; Host CPU: core-avx-i Processor Details - Scaling Governor: acpi-cpufreq ondemand
OpenMP Compiler GCC Clang clomp: Static OMP Speedup ttsiod-renderer: Phong Rendering With Soft-Shadow Mapping graphics-magick: Blur graphics-magick: Sharpen graphics-magick: Resizing graphics-magick: HWB Color Space graphics-magick: Local Adaptive Thresholding build-apache: Time To Compile c-ray: Total Time smallpt: Global Illumination Renderer; 100 Samples encode-flac: WAV To FLAC encode-mp3: WAV To MP3 GCC 4.9.0 Clang 3.4 Stock Clang 3.4 Intel OpenMP 2.69 64.35 100 64 114 134 70 60.08 74.00 239 6.02 15.93 64 42 87 110 68 43.35 83.96 484 6.65 15.06 64.18 88 59 113 68 41.94 83.91 238 6.66 15.06 OpenBenchmarking.org
CLOMP Static OMP Speedup OpenBenchmarking.org Speedup, More Is Better CLOMP 3.3 Static OMP Speedup GCC 4.9.0 0.6053 1.2106 1.8159 2.4212 3.0265 SE +/- 0.00, N = 5 2.69 1. (CC) gcc options: --openmp -O3 -lm
TTSIOD 3D Renderer Phong Rendering With Soft-Shadow Mapping OpenBenchmarking.org FPS, More Is Better TTSIOD 3D Renderer 2.2z Phong Rendering With Soft-Shadow Mapping GCC 4.9.0 Clang 3.4 Intel OpenMP 14 28 42 56 70 SE +/- 0.04, N = 3 SE +/- 0.10, N = 3 64.35 64.18 1. (CXX) g++ options: -O3 -fomit-frame-pointer -ffast-math -mtune=native -flto -msse -mrecip -mfpmath=sse -msse2 -mssse3 -lSDL -lstdc++
GraphicsMagick Operation: Blur OpenBenchmarking.org Iterations Per Minute, More Is Better GraphicsMagick 1.3.19 Operation: Blur GCC 4.9.0 Clang 3.4 Stock Clang 3.4 Intel OpenMP 20 40 60 80 100 SE +/- 0.00, N = 3 SE +/- 0.00, N = 3 SE +/- 0.00, N = 3 100 64 88 -std=gnu99 -fopenmp -lgomp -fopenmp -lgomp 1. (CC) gcc options: -O2 -pthread -ljbig -lwebp -ljpeg -lXext -lSM -lICE -lX11 -llzma -lxml2 -lz -lm -lpthread
GraphicsMagick Operation: Sharpen OpenBenchmarking.org Iterations Per Minute, More Is Better GraphicsMagick 1.3.19 Operation: Sharpen GCC 4.9.0 Clang 3.4 Stock Clang 3.4 Intel OpenMP 14 28 42 56 70 SE +/- 0.33, N = 3 SE +/- 0.00, N = 3 SE +/- 0.00, N = 3 64 42 59 -std=gnu99 -fopenmp -lgomp -fopenmp -lgomp 1. (CC) gcc options: -O2 -pthread -ljbig -lwebp -ljpeg -lXext -lSM -lICE -lX11 -llzma -lxml2 -lz -lm -lpthread
GraphicsMagick Operation: Resizing OpenBenchmarking.org Iterations Per Minute, More Is Better GraphicsMagick 1.3.19 Operation: Resizing GCC 4.9.0 Clang 3.4 Stock 30 60 90 120 150 SE +/- 0.00, N = 3 SE +/- 0.00, N = 3 114 87 -std=gnu99 -fopenmp -lgomp 1. (CC) gcc options: -O2 -pthread -ljbig -lwebp -ljpeg -lXext -lSM -lICE -lX11 -llzma -lxml2 -lz -lm -lpthread
GraphicsMagick Operation: HWB Color Space OpenBenchmarking.org Iterations Per Minute, More Is Better GraphicsMagick 1.3.19 Operation: HWB Color Space GCC 4.9.0 Clang 3.4 Stock Clang 3.4 Intel OpenMP 30 60 90 120 150 SE +/- 0.33, N = 3 SE +/- 0.00, N = 3 SE +/- 0.00, N = 3 134 110 113 -std=gnu99 -fopenmp -lgomp -fopenmp -lgomp 1. (CC) gcc options: -O2 -pthread -ljbig -lwebp -ljpeg -lXext -lSM -lICE -lX11 -llzma -lxml2 -lz -lm -lpthread
GraphicsMagick Operation: Local Adaptive Thresholding OpenBenchmarking.org Iterations Per Minute, More Is Better GraphicsMagick 1.3.19 Operation: Local Adaptive Thresholding GCC 4.9.0 Clang 3.4 Stock Clang 3.4 Intel OpenMP 16 32 48 64 80 SE +/- 0.00, N = 3 SE +/- 0.00, N = 3 SE +/- 0.00, N = 3 70 68 68 -std=gnu99 -fopenmp -lgomp -fopenmp -lgomp 1. (CC) gcc options: -O2 -pthread -ljbig -lwebp -ljpeg -lXext -lSM -lICE -lX11 -llzma -lxml2 -lz -lm -lpthread
Timed Apache Compilation Time To Compile OpenBenchmarking.org Seconds, Fewer Is Better Timed Apache Compilation 2.4.7 Time To Compile GCC 4.9.0 Clang 3.4 Stock Clang 3.4 Intel OpenMP 13 26 39 52 65 SE +/- 0.11, N = 3 SE +/- 0.07, N = 3 SE +/- 0.05, N = 3 60.08 43.35 41.94
C-Ray Total Time OpenBenchmarking.org Seconds, Fewer Is Better C-Ray 1.1 Total Time GCC 4.9.0 Clang 3.4 Stock Clang 3.4 Intel OpenMP 20 40 60 80 100 SE +/- 0.01, N = 3 SE +/- 0.03, N = 3 SE +/- 0.03, N = 3 74.00 83.96 83.91 1. (CC) gcc options: -lm -lpthread -O3
Smallpt Global Illumination Renderer; 100 Samples OpenBenchmarking.org Seconds, Fewer Is Better Smallpt 1.0 Global Illumination Renderer; 100 Samples GCC 4.9.0 Clang 3.4 Stock Clang 3.4 Intel OpenMP 100 200 300 400 500 SE +/- 0.00, N = 3 SE +/- 0.33, N = 3 SE +/- 0.00, N = 3 239 484 238 1. (CXX) g++ options: -fopenmp
FLAC Audio Encoding WAV To FLAC OpenBenchmarking.org Seconds, Fewer Is Better FLAC Audio Encoding 1.3.0 WAV To FLAC GCC 4.9.0 Clang 3.4 Stock Clang 3.4 Intel OpenMP 2 4 6 8 10 SE +/- 0.00, N = 5 SE +/- 0.00, N = 5 SE +/- 0.00, N = 5 6.02 6.65 6.66 1. (CXX) g++ options: -O2 -fvisibility=hidden -logg -lm
LAME MP3 Encoding WAV To MP3 OpenBenchmarking.org Seconds, Fewer Is Better LAME MP3 Encoding 3.99.3 WAV To MP3 GCC 4.9.0 Clang 3.4 Stock Clang 3.4 Intel OpenMP 4 8 12 16 20 SE +/- 0.01, N = 5 SE +/- 0.01, N = 5 SE +/- 0.01, N = 5 15.93 15.06 15.06 1. (CC) gcc options: -O3 -ffast-math -funroll-loops -pipe -lncurses -lm
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