GCC Clang Intel Skylake Compiler Perf

GCC vs. LLVM Clang on Intel Core i5 Skylake system. Benchmarks by Michael Larabel for a future article on Phoronix.

HTML result view exported from: https://openbenchmarking.org/result/2103154-HA-1509040HA49&sro&grs.

GCC Clang Intel Skylake Compiler PerfProcessorMotherboardChipsetMemoryDiskGraphicsAudioMonitorNetworkOSKernelDesktopDisplay ServerDisplay DriverOpenGLCompilerFile-SystemScreen ResolutionGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830Clang 3.8 SVNClang 3.8 SVN OMPSR740_1509040-HA-GCCINTELS_compareIntel Core i5-6600K @ 3.50GHz (4 Cores)MSI Z170A GAMING PRO (MS-7984) v1.0Intel Sky Lake15360MB256GB TS256GSSD370SIntel Sky Lake (1150MHz)Realtek ALC1150DELL P2210HIntel ConnectionUbuntu 15.104.2.0-999-generic (x86_64) 20150901Xfce 4.12X Server 1.17.2intel 2.99.9173.3 Mesa 10.6.5GCC 4.9.3ext41920x1080GCC 5.2.0GCC 6.0.0 20150830Clang 3.8.0 (SVN 246796) + LLVM 3.8.0svn2 x Intel Xeon Silver 4214R @ 3.50GHz (24 Cores / 48 Threads)Yunke China 0DY2X0 (2.10.0 BIOS)Intel Sky Lake-E DMI3 Registers6 x 32 GB DDR4-3200MT/s HMA84GR7DJR4N-XN16001GB PERC H730P Adp + 480GB PERC H730P AdpMatrox G200eW32 x Intel I350 + 2 x Intel 82599ES 10-Gigabit SFI/SFP+CentOS Linux 73.10.0-1160.15.2.el7.x86_64 (x86_64)GCC 4.8.5 20150623xfs1024x768OpenBenchmarking.orgKernel Details- GCC 4.9.3: i915.preliminary_hw_support=1- GCC 5.2.0: i915.preliminary_hw_support=1- GCC 6.0.0 20150830: i915.preliminary_hw_support=1- Clang 3.8 SVN: i915.preliminary_hw_support=1- Clang 3.8 SVN OMP: i915.preliminary_hw_support=1- SR740_1509040-HA-GCCINTELS_compare: Transparent Huge Pages: alwaysCompiler Details- GCC 4.9.3: --disable-multilib --enable-checking=release --enable-languages=c,c++- GCC 5.2.0: --disable-multilib --enable-checking=release --enable-languages=c,c++- GCC 6.0.0 20150830: --disable-multilib --enable-checking=release --enable-languages=c,c++- Clang 3.8 SVN: Optimized build; Built Sep 3 2015 (15:42:57); Default target: x86_64-unknown-linux-gnu; Host CPU: skylake- Clang 3.8 SVN OMP: Optimized build; Built Sep 3 2015 (15:42:57); Default target: x86_64-unknown-linux-gnu; Host CPU: skylake- SR740_1509040-HA-GCCINTELS_compare: --build=x86_64-redhat-linux --disable-libgcj --disable-libunwind-exceptions --enable-__cxa_atexit --enable-bootstrap --enable-checking=release --enable-gnu-indirect-function --enable-gnu-unique-object --enable-initfini-array --enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin --enable-shared --enable-threads=posix --mandir=/usr/share/man --with-arch_32=x86-64 --with-linker-hash-style=gnu --with-tune=generic Processor Details- GCC 4.9.3: Scaling Governor: acpi-cpufreq ondemand- GCC 5.2.0: Scaling Governor: acpi-cpufreq ondemand- GCC 6.0.0 20150830: Scaling Governor: acpi-cpufreq ondemand- Clang 3.8 SVN: Scaling Governor: acpi-cpufreq ondemand- Clang 3.8 SVN OMP: Scaling Governor: acpi-cpufreq ondemand- SR740_1509040-HA-GCCINTELS_compare: Scaling Governor: intel_pstate performance - CPU Microcode: 0x5003006Security Details- SR740_1509040-HA-GCCINTELS_compare: SELinux + itlb_multihit: KVM: Mitigation of Split huge pages + l1tf: Not affected + mds: Not affected + meltdown: Not affected + spec_store_bypass: Mitigation of SSB disabled via prctl and seccomp + spectre_v1: Mitigation of Load fences usercopy/swapgs barriers and __user pointer sanitization + spectre_v2: Mitigation of Full retpoline IBPB + srbds: Not affected + tsx_async_abort: Mitigation of Clear buffers; SMT vulnerable

GCC Clang Intel Skylake Compiler Perfc-ray: Total Timerodinia: OpenMP Streamclustersmallpt: Global Illumination Renderer; 100 Samplesapache: Static Web Page Servingjohn-the-ripper: Blowfishjohn-the-ripper: MD5x264: H.264 Video Encodingscimark2: Dense LU Matrix Factorizationjohn-the-ripper: Traditional DESrodinia: OpenMP LavaMDrodinia: OpenMP CFD Solverscimark2: Compositeencode-flac: WAV To FLACscimark2: Jacobi Successive Over-Relaxationhmmer: Pfam Database Searchhimeno: Poisson Pressure Solverhint: FLOATscimark2: Monte Carloscimark2: Fast Fourier Transformscimark2: Sparse Matrix Multiplyencode-mp3: WAV To MP3GCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830Clang 3.8 SVNClang 3.8 SVN OMPSR740_1509040-HA-GCCINTELS_compare15.1735.272844411.00475576544169.172992.3424484000215.6765.981594.664.931125.209.332763.07394717206.91743.37373.002739.3910.6115.1135.012841662.12476077004171.092968.2325025333216.2065.181594.014.971125.119.162744.76402676204.80754.86372.762749.0810.7715.0935.002843039.62478276902171.242979.5225141333215.7263.271584.334.941125.239.242720.00404526879.23750.18374.272693.9510.5634.59128.8412344513.53122416684167.177111.796291333856.60183.972467.105.141474.459.521976.57293947985.31644.15383.762721.3311.33128.20311224166706283667857.02184.634.20221.71911513327.9234974442368486.292875.2911121433348.96217.5441478.457.2501003.606.6222332.664596361326865.97905653.74430.132429.50OpenBenchmarking.org

C-Ray

Total Time

OpenBenchmarking.orgSeconds, Fewer Is BetterC-Ray 1.1Total TimeClang 3.8 SVNGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare816243240SE +/- 0.010, N = 3SE +/- 0.012, N = 3SE +/- 0.002, N = 3SE +/- 0.003, N = 3SE +/- 0.014, N = 334.59015.17015.11015.0904.202-march=native-march=native-march=native-march=native1. (CC) gcc options: -lm -lpthread -O3

Rodinia

Test: OpenMP Streamcluster

OpenBenchmarking.orgSeconds, Fewer Is BetterRodinia 2.4Test: OpenMP StreamclusterClang 3.8 SVNClang 3.8 SVN OMPGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare306090120150SE +/- 0.58, N = 3SE +/- 0.06, N = 3SE +/- 0.04, N = 3SE +/- 0.05, N = 3SE +/- 0.01, N = 3SE +/- 0.60, N = 15128.84128.2035.2735.0135.0021.721. (CXX) g++ options: -O2 -lOpenCL

Smallpt

Global Illumination Renderer; 100 Samples

OpenBenchmarking.orgSeconds, Fewer Is BetterSmallpt 1.0Global Illumination Renderer; 100 SamplesClang 3.8 SVNClang 3.8 SVN OMPGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare306090120150SE +/- 0.33, N = 3SE +/- 0.33, N = 3SE +/- 0.33, N = 3SE +/- 0.33, N = 3SE +/- 0.33, N = 3SE +/- 12.87, N = 1212331282828115-O3 -march=native-O3 -march=native -fopenmp=libomp -fno-exceptions-O3 -march=native-O3 -march=native-O3 -march=native1. (CXX) g++ options: -fopenmp

Apache Benchmark

Static Web Page Serving

OpenBenchmarking.orgRequests Per Second, More Is BetterApache Benchmark 2.4.7Static Web Page ServingClang 3.8 SVNGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare10K20K30K40K50KSE +/- 388.92, N = 3SE +/- 154.80, N = 3SE +/- 288.36, N = 3SE +/- 1006.67, N = 6SE +/- 147.37, N = 344513.5344411.0041662.1243039.6213327.92-O3 -march=native-O3 -march=native-O3 -march=native-O3 -march=native-O21. (CC) gcc options: -shared -fPIC -pthread

John The Ripper

Test: Blowfish

OpenBenchmarking.orgReal C/S, More Is BetterJohn The Ripper 1.8.0Test: BlowfishClang 3.8 SVNClang 3.8 SVN OMPGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare7K14K21K28K35KSE +/- 0.67, N = 3SE +/- 1.86, N = 3SE +/- 3.00, N = 3SE +/- 4.10, N = 3SE +/- 1.67, N = 3SE +/- 72.22, N = 312241224475547604782349741. (CC) gcc options: -fopenmp -lcrypt

John The Ripper

Test: MD5

OpenBenchmarking.orgReal C/S, More Is BetterJohn The Ripper 1.8.0Test: MD5Clang 3.8 SVNClang 3.8 SVN OMPGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare90K180K270K360K450KSE +/- 0.33, N = 3SE +/- 10.67, N = 3SE +/- 51.00, N = 3SE +/- 0.00, N = 3SE +/- 51.00, N = 316684166707654477004769024423681. (CC) gcc options: -fopenmp -lcrypt

x264

H.264 Video Encoding

OpenBenchmarking.orgFrames Per Second, More Is Betterx264 2014-08-30H.264 Video EncodingClang 3.8 SVNGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare110220330440550SE +/- 0.27, N = 5SE +/- 0.56, N = 5SE +/- 0.39, N = 5SE +/- 0.43, N = 5SE +/- 2.04, N = 5167.17169.17171.09171.24486.29-march=native-march=native-march=native-march=native1. (CC) gcc options: -ldl -m64 -lm -lpthread -O3 -ffast-math -std=gnu99 -fomit-frame-pointer -fno-tree-vectorize

SciMark

Computational Test: Dense LU Matrix Factorization

OpenBenchmarking.orgMflops, More Is BetterSciMark 2.0Computational Test: Dense LU Matrix FactorizationClang 3.8 SVNGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare15003000450060007500SE +/- 5.00, N = 4SE +/- 0.38, N = 4SE +/- 7.45, N = 4SE +/- 2.56, N = 4SE +/- 12.94, N = 47111.792992.342968.232979.522875.29-O3 -march=native-O3 -march=native-O3 -march=native-O3 -march=native1. (CXX) g++ options:

John The Ripper

Test: Traditional DES

OpenBenchmarking.orgReal C/S, More Is BetterJohn The Ripper 1.8.0Test: Traditional DESClang 3.8 SVNClang 3.8 SVN OMPGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare20M40M60M80M100MSE +/- 2333.33, N = 3SE +/- 666.67, N = 3SE +/- 175214.15, N = 3SE +/- 72723.98, N = 3SE +/- 10397.65, N = 3SE +/- 245045.80, N = 3629133362836672448400025025333251413331112143331. (CC) gcc options: -fopenmp -lcrypt

Rodinia

Test: OpenMP LavaMD

OpenBenchmarking.orgSeconds, Fewer Is BetterRodinia 2.4Test: OpenMP LavaMDClang 3.8 SVNClang 3.8 SVN OMPGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare2004006008001000SE +/- 0.10, N = 3SE +/- 0.35, N = 3SE +/- 0.20, N = 3SE +/- 0.09, N = 3SE +/- 0.14, N = 3SE +/- 0.09, N = 3856.60857.02215.67216.20215.7248.961. (CXX) g++ options: -O2 -lOpenCL

Rodinia

Test: OpenMP CFD Solver

OpenBenchmarking.orgSeconds, Fewer Is BetterRodinia 2.4Test: OpenMP CFD SolverClang 3.8 SVNClang 3.8 SVN OMPGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare4080120160200SE +/- 0.19, N = 3SE +/- 0.62, N = 3SE +/- 0.21, N = 3SE +/- 0.19, N = 3SE +/- 0.63, N = 3SE +/- 0.11, N = 3183.97184.6365.9865.1863.2717.541. (CXX) g++ options: -O2 -lOpenCL

SciMark

Computational Test: Composite

OpenBenchmarking.orgMflops, More Is BetterSciMark 2.0Computational Test: CompositeClang 3.8 SVNGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare5001000150020002500SE +/- 1.28, N = 4SE +/- 0.46, N = 4SE +/- 1.66, N = 4SE +/- 0.86, N = 4SE +/- 5.81, N = 42467.101594.661594.011584.331478.45-O3 -march=native-O3 -march=native-O3 -march=native-O3 -march=native1. (CXX) g++ options:

FLAC Audio Encoding

WAV To FLAC

OpenBenchmarking.orgSeconds, Fewer Is BetterFLAC Audio Encoding 1.3.1WAV To FLACClang 3.8 SVNGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare246810SE +/- 0.003, N = 5SE +/- 0.002, N = 5SE +/- 0.002, N = 5SE +/- 0.002, N = 5SE +/- 0.037, N = 55.1404.9304.9704.9407.250-O3 -march=native -logg-O3 -march=native -fvisibility=hidden-O3 -march=native -fvisibility=hidden-O3 -march=native -fvisibility=hidden-O2 -fvisibility=hidden1. (CXX) g++ options: -lm

SciMark

Computational Test: Jacobi Successive Over-Relaxation

OpenBenchmarking.orgMflops, More Is BetterSciMark 2.0Computational Test: Jacobi Successive Over-RelaxationClang 3.8 SVNGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare30060090012001500SE +/- 0.06, N = 4SE +/- 0.12, N = 4SE +/- 0.03, N = 4SE +/- 0.01, N = 4SE +/- 3.88, N = 41474.451125.201125.111125.231003.60-O3 -march=native-O3 -march=native-O3 -march=native-O3 -march=native1. (CXX) g++ options:

Timed HMMer Search

Pfam Database Search

OpenBenchmarking.orgSeconds, Fewer Is BetterTimed HMMer Search 2.3.2Pfam Database SearchClang 3.8 SVNGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare3691215SE +/- 0.031, N = 3SE +/- 0.047, N = 3SE +/- 0.003, N = 3SE +/- 0.056, N = 3SE +/- 0.019, N = 39.5209.3309.1609.2406.622-O3 -march=native-O3 -march=native-O3 -march=native-O3 -march=native-O21. (CC) gcc options: -pthread -lhmmer -lsquid -lm

Himeno Benchmark

Poisson Pressure Solver

OpenBenchmarking.orgMFLOPS, More Is BetterHimeno Benchmark 3.0Poisson Pressure SolverClang 3.8 SVNGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare6001200180024003000SE +/- 1.58, N = 3SE +/- 0.74, N = 3SE +/- 14.56, N = 3SE +/- 3.11, N = 3SE +/- 8.51, N = 31976.572763.072744.762720.002332.66-march=native-march=native-march=native-march=native1. (CC) gcc options: -O3

Hierarchical INTegration

Test: FLOAT

OpenBenchmarking.orgQUIPs, More Is BetterHierarchical INTegration 1.0Test: FLOATClang 3.8 SVNGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare90M180M270M360M450MSE +/- 129692.07, N = 3SE +/- 252594.71, N = 3SE +/- 279552.00, N = 3SE +/- 358895.73, N = 3SE +/- 144132.51, N = 3293947985.31394717206.91402676204.80404526879.23361326865.981. (CC) gcc options: -O3 -march=native -lm

SciMark

Computational Test: Monte Carlo

OpenBenchmarking.orgMflops, More Is BetterSciMark 2.0Computational Test: Monte CarloClang 3.8 SVNGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare160320480640800SE +/- 0.05, N = 4SE +/- 0.01, N = 4SE +/- 0.02, N = 4SE +/- 0.00, N = 4SE +/- 1.90, N = 4644.15743.37754.86750.18653.74-O3 -march=native-O3 -march=native-O3 -march=native-O3 -march=native1. (CXX) g++ options:

SciMark

Computational Test: Fast Fourier Transform

OpenBenchmarking.orgMflops, More Is BetterSciMark 2.0Computational Test: Fast Fourier TransformClang 3.8 SVNGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare90180270360450SE +/- 0.82, N = 4SE +/- 1.15, N = 4SE +/- 0.57, N = 4SE +/- 0.67, N = 4SE +/- 4.85, N = 4383.76373.00372.76374.27430.13-O3 -march=native-O3 -march=native-O3 -march=native-O3 -march=native1. (CXX) g++ options:

SciMark

Computational Test: Sparse Matrix Multiply

OpenBenchmarking.orgMflops, More Is BetterSciMark 2.0Computational Test: Sparse Matrix MultiplyClang 3.8 SVNGCC 4.9.3GCC 5.2.0GCC 6.0.0 20150830SR740_1509040-HA-GCCINTELS_compare6001200180024003000SE +/- 2.25, N = 4SE +/- 2.49, N = 4SE +/- 1.46, N = 4SE +/- 2.13, N = 3SE +/- 19.09, N = 42721.332739.392749.082693.952429.50-O3 -march=native-O3 -march=native-O3 -march=native-O3 -march=native1. (CXX) g++ options:

LAME MP3 Encoding

WAV To MP3

OpenBenchmarking.orgSeconds, Fewer Is BetterLAME MP3 Encoding 3.99.3WAV To MP3Clang 3.8 SVNGCC 4.9.3GCC 5.2.0GCC 6.0.0 201508303691215SE +/- 0.00, N = 5SE +/- 0.00, N = 5SE +/- 0.00, N = 5SE +/- 0.00, N = 511.3310.6110.7710.561. (CC) gcc options: -pipe -O3 -march=native -lm

Phoronix Test Suite v10.8.4