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&grt&rdt .
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 Intel OpenMP Clang 3.4 Stock 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 + LLVM 3.4 Clang 3.4-1ubuntu3 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 c-ray: Total Time clomp: Static OMP Speedup encode-flac: WAV To FLAC graphics-magick: Blur graphics-magick: Sharpen graphics-magick: Resizing graphics-magick: HWB Color Space graphics-magick: Local Adaptive Thresholding encode-mp3: WAV To MP3 smallpt: Global Illumination Renderer; 100 Samples build-apache: Time To Compile ttsiod-renderer: Phong Rendering With Soft-Shadow Mapping GCC 4.9.0 Clang 3.4 Intel OpenMP Clang 3.4 Stock 74.00 2.69 6.02 100 64 114 134 70 15.93 239 60.08 64.35 83.91 6.66 88 59 113 68 15.06 238 41.94 64.18 83.96 6.65 64 42 87 110 68 15.06 484 43.35 OpenBenchmarking.org
C-Ray Total Time OpenBenchmarking.org Seconds, Fewer Is Better C-Ray 1.1 Total Time GCC 4.9.0 Clang 3.4 Intel OpenMP Clang 3.4 Stock 20 40 60 80 100 SE +/- 0.01, N = 3 SE +/- 0.03, N = 3 SE +/- 0.03, N = 3 74.00 83.91 83.96 1. (CC) gcc options: -lm -lpthread -O3
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
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 Intel OpenMP Clang 3.4 Stock 2 4 6 8 10 SE +/- 0.00, N = 5 SE +/- 0.00, N = 5 SE +/- 0.00, N = 5 6.02 6.66 6.65 1. (CXX) g++ options: -O2 -fvisibility=hidden -logg -lm
GraphicsMagick Operation: Blur OpenBenchmarking.org Iterations Per Minute, More Is Better GraphicsMagick 1.3.19 Operation: Blur GCC 4.9.0 Clang 3.4 Intel OpenMP Clang 3.4 Stock 20 40 60 80 100 SE +/- 0.00, N = 3 SE +/- 0.00, N = 3 SE +/- 0.00, N = 3 100 88 64 -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 Intel OpenMP Clang 3.4 Stock 14 28 42 56 70 SE +/- 0.33, N = 3 SE +/- 0.00, N = 3 SE +/- 0.00, N = 3 64 59 42 -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 Intel OpenMP Clang 3.4 Stock 30 60 90 120 150 SE +/- 0.33, N = 3 SE +/- 0.00, N = 3 SE +/- 0.00, N = 3 134 113 110 -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 Intel OpenMP Clang 3.4 Stock 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
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 Intel OpenMP Clang 3.4 Stock 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
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 Intel OpenMP Clang 3.4 Stock 100 200 300 400 500 SE +/- 0.00, N = 3 SE +/- 0.00, N = 3 SE +/- 0.33, N = 3 239 238 484 1. (CXX) g++ options: -fopenmp
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 Intel OpenMP Clang 3.4 Stock 13 26 39 52 65 SE +/- 0.11, N = 3 SE +/- 0.05, N = 3 SE +/- 0.07, N = 3 60.08 41.94 43.35
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++
Phoronix Test Suite v10.8.5