LLVM Clang 3.4 Compiler Optimization Levels

Benchmarking LLVM/Clang compiler optimization levels for a future article on phoronix.com.

Compare your own system(s) to this result file with the Phoronix Test Suite by running the command: phoronix-test-suite benchmark 1307304-SO-CLANGLEVE44
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Audio Encoding 2 Tests
Bioinformatics 2 Tests
Timed Code Compilation 2 Tests
C/C++ Compiler Tests 9 Tests
CPU Massive 7 Tests
Creator Workloads 5 Tests
Encoding 2 Tests
HPC - High Performance Computing 2 Tests
Multi-Core 6 Tests
Programmer / Developer System Benchmarks 2 Tests
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Scientific Computing 2 Tests
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-O0
July 29 2013
 
-O1
July 29 2013
 
-O2
July 29 2013
 
-Os
July 29 2013
 
-O3
July 28 2013
 
-Ofast
July 29 2013
 
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-O3

Compiler Notes: Optimized build; Built Jul 28 2013 (21:43:17); Default target: x86_64-unknown-linux-gnu; Host CPU: corei7
Processor Notes: Scaling Governor: acpi-cpufreq ondemand

-O2

-O1

-O0

-Os

-Ofast

Processor: Intel Core i7 720Q @ 1.60GHz (8 Cores), Motherboard: LENOVO 4318CTO, Chipset: Intel Core DMI, Memory: 4096MB, Disk: 160GB INTEL SSDSA2M160, Graphics: NVIDIA Quadro FX 880M 1024MB (405/324MHz), Audio: Conexant CX20585, Network: Intel 82577LM Gigabit Connection + Intel Centrino Ultimate-N 6300

OS: Ubuntu 13.10, Kernel: 3.11.0-031100rc2-generic (x86_64), Desktop: Xfce 4.10, Display Server: X Server 1.14.2, Display Driver: nouveau 1.0.8, OpenGL: 3.0 Mesa 9.1.4 Gallium 0.4, Compiler: Clang 3.4 (SVN 187338) + LLVM 3.4svn, File-System: ext4, Screen Resolution: 1600x900

LLVM Clang 3.4 Compiler Optimization LevelsOpenBenchmarking.orgPhoronix Test SuiteIntel Core i7 720Q @ 1.60GHz (8 Cores)LENOVO 4318CTOIntel Core DMI4096MB160GB INTEL SSDSA2M160NVIDIA Quadro FX 880M 1024MB (405/324MHz)Conexant CX20585Intel 82577LM Gigabit Connection + Intel Centrino Ultimate-N 6300Ubuntu 13.103.11.0-031100rc2-generic (x86_64)Xfce 4.10X Server 1.14.2nouveau 1.0.83.0 Mesa 9.1.4 Gallium 0.4Clang 3.4 (SVN 187338) + LLVM 3.4svnext41600x900ProcessorMotherboardChipsetMemoryDiskGraphicsAudioNetworkOSKernelDesktopDisplay ServerDisplay DriverOpenGLCompilerFile-SystemScreen ResolutionLLVM Clang 3.4 Compiler Optimization Levels PerformanceSystem Logs- Optimized build; Built Jul 28 2013 (21:43:17); Default target: x86_64-unknown-linux-gnu; Host CPU: corei7 - Scaling Governor: acpi-cpufreq ondemand

-O3-O2-O1-O0-Os-OfastLogarithmic Result OverviewPhoronix Test SuiteHimeno BenchmarkFLAC Audio EncodingTimed HMMer SearchN-QueensLAME MP3 EncodingGraphicsMagickTimed ImageMagick CompilationSmallptC-RayTimed PHP CompilationSciMark

LLVM Clang 3.4 Compiler Optimization Levelsc-ray: Total Timeencode-flac: WAV To FLACgraphics-magick: Blurgraphics-magick: Sharpengraphics-magick: Resizinggraphics-magick: HWB Color Spacegraphics-magick: Local Adaptive Thresholdinghimeno: Poisson Pressure Solverencode-mp3: WAV To MP3n-queens: Elapsed Timescimark2: Fast Fourier Transformsmallpt: Global Illumination Renderer; 100 Sampleshmmer: Pfam Database Searchbuild-imagemagick: Time To Compilebuild-php: Time To Compile-O3-O2-O1-O0-Os-Ofast75.988.8653366680321055.0822.64345.38173.5729327.3365.8841.97103.779.0053366680321129.5622.72343.18189.7229227.3165.3035.51100.1111.2653356681311105.3623.55386.21189.1041030.8957.3731.28208.5344.12221024368127.9567.471083.88189.3077089.3323.1418.55104.7211.1652366679301102.6823.04331.72190.1432028.6863.3333.4493.638.8553366797311128.5022.00343.65188.0627527.1066.5542.15OpenBenchmarking.org

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 Time-O3-O2-O1-O0-Os-Ofast50100150200250SE +/- 0.04, N = 3SE +/- 0.02, N = 3SE +/- 0.01, N = 3SE +/- 0.07, N = 3SE +/- 0.04, N = 3SE +/- 0.03, N = 375.98103.77100.11208.53104.7293.63-O2-O1-O0-Os-Ofast1. (CC) gcc options: -lm -lpthread -O3 -march=native

FLAC Audio Encoding

OpenBenchmarking.orgSeconds, Fewer Is BetterFLAC Audio Encoding 1.3.0WAV To FLAC-O3-O2-O1-O0-Os-Ofast1020304050SE +/- 0.01, N = 5SE +/- 0.01, N = 5SE +/- 0.05, N = 5SE +/- 0.02, N = 5SE +/- 0.01, N = 5SE +/- 0.01, N = 58.869.0011.2644.1211.168.85-O3-O2-O1-O0-Os-Ofast1. (CXX) g++ options: -march=native -fvisibility=hidden -logg -lm

GraphicsMagick

OpenBenchmarking.orgIterations Per Minute, More Is BetterGraphicsMagick 1.3.16Operation: Blur-O3-O2-O1-O0-Os-Ofast1224364860SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.33, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 3535353225253-O3-O2-O1-O0-Os-Ofast1. (CC) gcc options: -march=native -pthread -lXext -lSM -lICE -lX11 -lxml2 -lz -lm -lpthread

OpenBenchmarking.orgIterations Per Minute, More Is BetterGraphicsMagick 1.3.16Operation: Sharpen-O3-O2-O1-O0-Os-Ofast816243240SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 3363635103636-O3-O2-O1-O0-Os-Ofast1. (CC) gcc options: -march=native -pthread -lXext -lSM -lICE -lX11 -lxml2 -lz -lm -lpthread

OpenBenchmarking.orgIterations Per Minute, More Is BetterGraphicsMagick 1.3.16Operation: Resizing-O3-O2-O1-O0-Os-Ofast1530456075SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.33, N = 3666666246667-O3-O2-O1-O0-Os-Ofast1. (CC) gcc options: -march=native -pthread -lXext -lSM -lICE -lX11 -lxml2 -lz -lm -lpthread

OpenBenchmarking.orgIterations Per Minute, More Is BetterGraphicsMagick 1.3.16Operation: HWB Color Space-O3-O2-O1-O0-Os-Ofast20406080100SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.33, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 3808081367997-O3-O2-O1-O0-Os-Ofast1. (CC) gcc options: -march=native -pthread -lXext -lSM -lICE -lX11 -lxml2 -lz -lm -lpthread

OpenBenchmarking.orgIterations Per Minute, More Is BetterGraphicsMagick 1.3.16Operation: Local Adaptive Thresholding-O3-O2-O1-O0-Os-Ofast714212835SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 332323183031-O3-O2-O1-O0-Os-Ofast1. (CC) gcc options: -march=native -pthread -lXext -lSM -lICE -lX11 -lxml2 -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 Solver-O3-O2-O1-O0-Os-Ofast2004006008001000SE +/- 5.78, N = 3SE +/- 0.39, N = 3SE +/- 0.14, N = 3SE +/- 0.03, N = 3SE +/- 0.03, N = 3SE +/- 0.36, N = 31055.081129.561105.36127.951102.681128.50-O2-O1-O0-Os-Ofast1. (CC) gcc options: -O3 -march=native

LAME MP3 Encoding

LAME is an MP3 encoder licensed under the LGPL. This test measures the time required to encode a WAV file to MP3 format. Learn more via the OpenBenchmarking.org test page.

OpenBenchmarking.orgSeconds, Fewer Is BetterLAME MP3 Encoding 3.99.3WAV To MP3-O3-O2-O1-O0-Os-Ofast1530456075SE +/- 0.02, N = 5SE +/- 0.01, N = 5SE +/- 0.01, N = 5SE +/- 0.02, N = 5SE +/- 0.01, N = 5SE +/- 0.01, N = 522.6422.7223.5567.4723.0422.00-O3-O2-O1-O0-Os-Ofast1. (CC) gcc options: -pipe -march=native -lm

N-Queens

This is a test of the OpenMP version of a test that solves the N-queens problem. The board problem size is 18. Learn more via the OpenBenchmarking.org test page.

OpenBenchmarking.orgSeconds, Fewer Is BetterN-Queens 1.0Elapsed Time-O3-O2-O1-O0-Os-Ofast2004006008001000SE +/- 0.89, N = 3SE +/- 0.03, N = 3SE +/- 0.00, N = 3SE +/- 0.13, N = 3SE +/- 0.13, N = 3SE +/- 0.04, N = 3345.38343.18386.211083.88331.72343.65-O2-O1-O0-Os-Ofast1. (CC) gcc options: -static -fopenmp -O3 -march=native

SciMark

This test runs the ANSI C version of SciMark 2.0, which is a benchmark for scientific and numerical computing developed by programmers at the National Institute of Standards and Technology. This test is made up of Fast Foruier Transform, Jacobi Successive Over-relaxation, Monte Carlo, Sparse Matrix Multiply, and dense LU matrix factorization benchmarks. Learn more via the OpenBenchmarking.org test page.

OpenBenchmarking.orgMflops, More Is BetterSciMark 2.0Computational Test: Fast Fourier Transform-O3-O2-O1-O0-Os-Ofast4080120160200SE +/- 0.61, N = 4SE +/- 0.24, N = 4SE +/- 0.52, N = 4SE +/- 0.00, N = 4SE +/- 0.00, N = 4SE +/- 0.41, N = 4173.57189.72189.10189.30190.14188.06-O3-O2-O1-O0-Os-Ofast1. (CXX) g++ options: -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 Samples-O3-O2-O1-O0-Os-Ofast170340510680850SE +/- 0.58, N = 3SE +/- 0.88, N = 3SE +/- 0.33, N = 3SE +/- 0.58, N = 3SE +/- 1.67, N = 3SE +/- 0.33, N = 3293292410770320275-O3-O2-O1-O0-Os-Ofast1. (CXX) g++ options: -fopenmp -march=native

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 Search-O3-O2-O1-O0-Os-Ofast20406080100SE +/- 0.02, N = 3SE +/- 0.05, N = 3SE +/- 0.03, N = 3SE +/- 0.46, N = 3SE +/- 0.06, N = 3SE +/- 0.04, N = 327.3327.3130.8989.3328.6827.10-O3-O2-O1-O0-Os-Ofast1. (CC) gcc options: -march=native -pthread -lhmmer -lsquid -lm

Timed ImageMagick Compilation

OpenBenchmarking.orgSeconds, Fewer Is BetterTimed ImageMagick Compilation 6.8.1-10Time To Compile-O3-O2-O1-O0-Os-Ofast1530456075SE +/- 0.18, N = 3SE +/- 0.22, N = 3SE +/- 0.11, N = 3SE +/- 0.03, N = 3SE +/- 0.14, N = 3SE +/- 0.12, N = 365.8865.3057.3723.1463.3366.55

Timed PHP Compilation

OpenBenchmarking.orgSeconds, Fewer Is BetterTimed PHP Compilation 5.2.9Time To Compile-O3-O2-O1-O0-Os-Ofast1020304050SE +/- 0.10, N = 3SE +/- 0.07, N = 3SE +/- 0.02, N = 3SE +/- 0.01, N = 3SE +/- 0.01, N = 3SE +/- 0.03, N = 341.9735.5131.2818.5533.4442.15-O3-O2-O1-O0-Os-Ofast1. (CC) gcc options: -march=native -pedantic -ldl -lz -lm

-O3

Compiler Notes: Optimized build; Built Jul 28 2013 (21:43:17); Default target: x86_64-unknown-linux-gnu; Host CPU: corei7
Processor Notes: Scaling Governor: acpi-cpufreq ondemand

Testing initiated at 28 July 2013 22:40 by user phoronix.

-O2

Compiler Notes: Optimized build; Built Jul 28 2013 (21:43:17); Default target: x86_64-unknown-linux-gnu; Host CPU: corei7
Processor Notes: Scaling Governor: acpi-cpufreq ondemand

Testing initiated at 29 July 2013 14:26 by user phoronix.

-O1

Compiler Notes: Optimized build; Built Jul 28 2013 (21:43:17); Default target: x86_64-unknown-linux-gnu; Host CPU: corei7
Processor Notes: Scaling Governor: acpi-cpufreq ondemand

Testing initiated at 29 July 2013 16:20 by user phoronix.

-O0

Compiler Notes: Optimized build; Built Jul 28 2013 (21:43:17); Default target: x86_64-unknown-linux-gnu; Host CPU: corei7
Processor Notes: Scaling Governor: acpi-cpufreq ondemand

Testing initiated at 29 July 2013 19:31 by user phoronix.

-Os

Compiler Notes: Optimized build; Built Jul 28 2013 (21:43:17); Default target: x86_64-unknown-linux-gnu; Host CPU: corei7
Processor Notes: Scaling Governor: acpi-cpufreq ondemand

Testing initiated at 29 July 2013 21:59 by user phoronix.

-Ofast

Processor: Intel Core i7 720Q @ 1.60GHz (8 Cores), Motherboard: LENOVO 4318CTO, Chipset: Intel Core DMI, Memory: 4096MB, Disk: 160GB INTEL SSDSA2M160, Graphics: NVIDIA Quadro FX 880M 1024MB (405/324MHz), Audio: Conexant CX20585, Network: Intel 82577LM Gigabit Connection + Intel Centrino Ultimate-N 6300

OS: Ubuntu 13.10, Kernel: 3.11.0-031100rc2-generic (x86_64), Desktop: Xfce 4.10, Display Server: X Server 1.14.2, Display Driver: nouveau 1.0.8, OpenGL: 3.0 Mesa 9.1.4 Gallium 0.4, Compiler: Clang 3.4 (SVN 187338) + LLVM 3.4svn, File-System: ext4, Screen Resolution: 1600x900

Compiler Notes: Optimized build; Built Jul 28 2013 (21:43:17); Default target: x86_64-unknown-linux-gnu; Host CPU: corei7
Processor Notes: Scaling Governor: acpi-cpufreq ondemand

Testing initiated at 29 July 2013 23:37 by user phoronix.