GCC 8.0 vs. Clang 6.0 AMD EPYC Tuning Comparison

Tests for a future article on Phoronix.

HTML result view exported from: https://openbenchmarking.org/result/1801025-AL-CLANGCC0290&obr_imw=y&sro&grs.

ProcessorMotherboardChipsetMemoryDiskGraphicsMonitorNetworkOSKernelDesktopDisplay DriverOpenCLCompilerFile-SystemScreen ResolutionSystem LayerGCC 8.0Clang 6.0 x86-64 znver1 x86-64 znver1AMD EPYC 7601 32-Core @ 2.20GHz (64 Cores)TYAN B8026T70AE24HRAMD Device 1450126976MB280GB INTEL SSDPE21D280GAASPEED ASPEED FamilyVE228Broadcom Limited NetXtreme BCM5720 Gigabit PCIeUbuntu 17.104.13.0-21-generic (x86_64)GNOME Shell 3.26.1modesetting 1.19.5OpenCL 1.2 pocl 1.0 LLVM 5.0.0GCC 8.0.0 20171231 + clang (GCC) 8.0.0 20171231 (experimental) + LLVM 5.0.0ext41920x1080vm-other Xen 4.9.0 HypervisorClang 6.0.0 (SVN 321623) + LLVM 6.0.0svnOpenBenchmarking.orgCompiler Details- GCC 8.0: x86-64: --disable-multilib --enable-checking=release- GCC 8.0: znver1: --disable-multilib --enable-checking=release- Clang 6.0: x86-64: Optimized build; Default target: x86_64-unknown-linux-gnu; Host CPU: znver1- Clang 6.0: znver1: Optimized build; Default target: x86_64-unknown-linux-gnu; Host CPU: znver1Disk Details- NONE / data=ordered,errors=remount-ro,relatime,rw

c-ray: Total Timegraphics-magick: Sharpengraphics-magick: HWB Color Spacegraphics-magick: Blurfftw: Stock - 2D FFT Size 4096encode-flac: WAV To FLACencode-mp3: WAV To MP3himeno: Poisson Pressure Solverfftw: Float + SSE - 2D FFT Size 4096polybench-c: 3 Matrix Multiplicationsgraphics-magick: Local Adaptive Thresholdingebizzy: sqlite: Default Test Directorybullet: 1000 Stackscimark2: Monte Carlobullet: Rayteststscp: AI Chess Performancebullet: 3000 Fallscimark2: Sparse Matrix Multiplyapache: Static Web Page Servingbullet: Convex Trimeshbullet: 1000 Convexbullet: 136 Ragdollsbullet: Prim Trimeshscimark2: Jacobi Successive Over-Relaxationscimark2: Dense LU Matrix Factorizationscimark2: Fast Fourier Transformscimark2: Compositehmmer: Pfam Database SearchGCC 8.0Clang 6.0 x86-64 znver1 x86-64 znver13.931571771164959.737.1211.10949.1960.689211260327.616.18561.033.128742515.342263.879841.301.345.443.261.101423.143513.11233.891579.4813.653.371651861235627.837.4510.81935.641363065.459511011767.165.93555.763.068750855.272259.959791.231.305.283.191.101676.623678.86231.091680.4512.404.531311501014660.837.9411.331032.711364962.989710766487.536.30531.383.229176585.482190.109531.431.335.433.281.101110.653190.43179.291479.5312.854.481361551045031.606.6312.811052.471248162.759811454057.486.08552.193.189182695.342258.649663.931.325.313.231.091424.214034.89226.681699.3211.09OpenBenchmarking.org

C-Ray

Total Time

x86-64znver1OpenBenchmarking.orgSeconds, Fewer Is BetterC-Ray 1.1Total TimeClang 6.0GCC 8.01.01932.03863.05794.07725.0965SE +/- 0.02, N = 3SE +/- 0.00, N = 3SE +/- 0.01, N = 3SE +/- 0.02, N = 34.533.934.483.371. (CC) gcc options: -lm -lpthread -O3 -march=znver1

GraphicsMagick

Operation: Sharpen

x86-64znver1OpenBenchmarking.orgIterations Per Minute, More Is BetterGraphicsMagick 1.3.19Operation: SharpenClang 6.0GCC 8.04080120160200SE +/- 0.67, N = 3SE +/- 0.33, N = 31311571361651. (CC) gcc options: -fopenmp -O3 -march=znver1 -pthread -ljbig -lwebp -ltiff -ljpeg -lXext -lSM -lICE -lX11 -llzma -lbz2 -lz -lm -lpthread

GraphicsMagick

Operation: HWB Color Space

x86-64znver1OpenBenchmarking.orgIterations Per Minute, More Is BetterGraphicsMagick 1.3.19Operation: HWB Color SpaceClang 6.0GCC 8.04080120160200SE +/- 1.20, N = 3SE +/- 0.88, N = 31501771551861. (CC) gcc options: -fopenmp -O3 -march=znver1 -pthread -ljbig -lwebp -ltiff -ljpeg -lXext -lSM -lICE -lX11 -llzma -lbz2 -lz -lm -lpthread

GraphicsMagick

Operation: Blur

x86-64znver1OpenBenchmarking.orgIterations Per Minute, More Is BetterGraphicsMagick 1.3.19Operation: BlurClang 6.0GCC 8.0306090120150SE +/- 0.33, N = 3SE +/- 0.33, N = 31011161041231. (CC) gcc options: -fopenmp -O3 -march=znver1 -pthread -ljbig -lwebp -ltiff -ljpeg -lXext -lSM -lICE -lX11 -llzma -lbz2 -lz -lm -lpthread

FFTW

Build: Stock - Size: 2D FFT Size 4096

x86-64znver1OpenBenchmarking.orgMflops, More Is BetterFFTW 3.3.6Build: Stock - Size: 2D FFT Size 4096Clang 6.0GCC 8.012002400360048006000SE +/- 57.25, N = 3SE +/- 1.16, N = 3SE +/- 17.93, N = 3SE +/- 10.37, N = 34660.834959.735031.605627.831. (CC) gcc options: -pthread -O3 -march=znver1 -lm

FLAC Audio Encoding

WAV To FLAC

x86-64znver1OpenBenchmarking.orgSeconds, Fewer Is BetterFLAC Audio Encoding 1.3.1WAV To FLACClang 6.0GCC 8.0246810SE +/- 0.01, N = 5SE +/- 0.01, N = 5SE +/- 0.00, N = 5SE +/- 0.01, N = 57.947.126.637.451. (CXX) g++ options: -O3 -march=znver1 -logg -lm

LAME MP3 Encoding

WAV To MP3

x86-64znver1OpenBenchmarking.orgSeconds, Fewer Is BetterLAME MP3 Encoding 3.99.5WAV To MP3Clang 6.0GCC 8.03691215SE +/- 0.00, N = 5SE +/- 0.02, N = 5SE +/- 0.01, N = 5SE +/- 0.01, N = 511.3311.1012.8110.811. (CC) gcc options: -O3 -ffast-math -funroll-loops -fschedule-insns2 -fbranch-count-reg -fforce-addr -pipe -march=znver1 -lm

Himeno Benchmark

Poisson Pressure Solver

x86-64znver1OpenBenchmarking.orgMFLOPS, More Is BetterHimeno Benchmark 3.0Poisson Pressure SolverClang 6.0GCC 8.02004006008001000SE +/- 1.46, N = 3SE +/- 0.43, N = 3SE +/- 1.50, N = 3SE +/- 0.79, N = 31032.71949.191052.47935.641. (CC) gcc options: -O3 -march=znver1 -mavx2

FFTW

Build: Float + SSE - Size: 2D FFT Size 4096

x86-64znver1OpenBenchmarking.orgMflops, More Is BetterFFTW 3.3.6Build: Float + SSE - Size: 2D FFT Size 4096Clang 6.0GCC 8.03K6K9K12K15KSE +/- 100.95, N = 3SE +/- 76.70, N = 3SE +/- 15.38, N = 31364912481136301. (CC) gcc options: -pthread -O3 -march=znver1 -lm

PolyBench-C

Test: 3 Matrix Multiplications

x86-64znver1OpenBenchmarking.orgSeconds, Fewer Is BetterPolyBench-C 3.2Test: 3 Matrix MultiplicationsClang 6.0GCC 8.01530456075SE +/- 0.24, N = 3SE +/- 0.03, N = 3SE +/- 0.26, N = 3SE +/- 0.21, N = 362.9860.6862.7565.451. (CC) gcc options: -O3 -march=znver1 -march=native

GraphicsMagick

Operation: Local Adaptive Thresholding

x86-64znver1OpenBenchmarking.orgIterations Per Minute, More Is BetterGraphicsMagick 1.3.19Operation: Local Adaptive ThresholdingClang 6.0GCC 8.020406080100SE +/- 0.33, N = 3SE +/- 0.33, N = 3979298951. (CC) gcc options: -fopenmp -O3 -march=znver1 -pthread -ljbig -lwebp -ltiff -ljpeg -lXext -lSM -lICE -lX11 -llzma -lbz2 -lz -lm -lpthread

ebizzy

x86-64znver1OpenBenchmarking.orgRecords/s, More Is Betterebizzy 0.3Clang 6.0GCC 8.0200K400K600K800K1000KSE +/- 12350.97, N = 3SE +/- 20747.16, N = 6SE +/- 17141.58, N = 6SE +/- 19461.21, N = 310766481126032114540511011761. (CC) gcc options: -pthread -lpthread -O3 -march=znver1 -march=native

SQLite

Test Target: Default Test Directory

x86-64znver1OpenBenchmarking.orgSeconds, Fewer Is BetterSQLite 3.8.10.2Test Target: Default Test DirectoryClang 6.0GCC 8.0246810SE +/- 0.06, N = 3SE +/- 0.12, N = 3SE +/- 0.15, N = 6SE +/- 0.12, N = 67.537.617.487.161. (CC) gcc options: -O3 -march=znver1 -ldl -lpthread

Bullet Physics Engine

Test: 1000 Stack

x86-64znver1OpenBenchmarking.orgSeconds, Fewer Is BetterBullet Physics Engine 2.81Test: 1000 StackClang 6.0GCC 8.0246810SE +/- 0.03, N = 3SE +/- 0.02, N = 3SE +/- 0.01, N = 3SE +/- 0.01, N = 36.306.186.085.931. (CXX) g++ options: -O3 -march=znver1 -rdynamic

SciMark

Computational Test: Monte Carlo

x86-64znver1OpenBenchmarking.orgMflops, More Is BetterSciMark 2.0Computational Test: Monte CarloClang 6.0GCC 8.0120240360480600SE +/- 0.05, N = 4SE +/- 0.04, N = 4SE +/- 0.05, N = 4SE +/- 0.01, N = 4531.38561.03552.19555.761. (CC) gcc options: -O3 -march=znver1 -lm

Bullet Physics Engine

Test: Raytests

x86-64znver1OpenBenchmarking.orgSeconds, Fewer Is BetterBullet Physics Engine 2.81Test: RaytestsClang 6.0GCC 8.00.72451.4492.17352.8983.6225SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.01, N = 33.223.123.183.061. (CXX) g++ options: -O3 -march=znver1 -rdynamic

TSCP

AI Chess Performance

x86-64znver1OpenBenchmarking.orgNodes Per Second, More Is BetterTSCP 1.81AI Chess PerformanceClang 6.0GCC 8.0200K400K600K800K1000KSE +/- 572.37, N = 5SE +/- 438.77, N = 5SE +/- 306.40, N = 5SE +/- 556.88, N = 59176588742519182698750851. (CC) gcc options: -O3 -march=znver1 -march=native

Bullet Physics Engine

Test: 3000 Fall

x86-64znver1OpenBenchmarking.orgSeconds, Fewer Is BetterBullet Physics Engine 2.81Test: 3000 FallClang 6.0GCC 8.01.2332.4663.6994.9326.165SE +/- 0.01, N = 3SE +/- 0.01, N = 3SE +/- 0.01, N = 3SE +/- 0.01, N = 35.485.345.345.271. (CXX) g++ options: -O3 -march=znver1 -rdynamic

SciMark

Computational Test: Sparse Matrix Multiply

x86-64znver1OpenBenchmarking.orgMflops, More Is BetterSciMark 2.0Computational Test: Sparse Matrix MultiplyClang 6.0GCC 8.05001000150020002500SE +/- 11.89, N = 4SE +/- 6.72, N = 4SE +/- 29.07, N = 4SE +/- 9.55, N = 42190.102263.872258.642259.951. (CC) gcc options: -O3 -march=znver1 -lm

Apache Benchmark

Static Web Page Serving

x86-64znver1OpenBenchmarking.orgRequests Per Second, More Is BetterApache Benchmark 2.4.7Static Web Page ServingClang 6.0GCC 8.02K4K6K8K10KSE +/- 161.49, N = 3SE +/- 22.88, N = 3SE +/- 121.20, N = 3SE +/- 35.54, N = 39531.439841.309663.939791.231. (CC) gcc options: -shared -fPIC -pthread -O3 -march=znver1

Bullet Physics Engine

Test: Convex Trimesh

x86-64znver1OpenBenchmarking.orgSeconds, Fewer Is BetterBullet Physics Engine 2.81Test: Convex TrimeshClang 6.0GCC 8.00.30150.6030.90451.2061.5075SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 31.331.341.321.301. (CXX) g++ options: -O3 -march=znver1 -rdynamic

Bullet Physics Engine

Test: 1000 Convex

x86-64znver1OpenBenchmarking.orgSeconds, Fewer Is BetterBullet Physics Engine 2.81Test: 1000 ConvexClang 6.0GCC 8.01.2242.4483.6724.8966.12SE +/- 0.01, N = 3SE +/- 0.00, N = 3SE +/- 0.01, N = 3SE +/- 0.01, N = 35.435.445.315.281. (CXX) g++ options: -O3 -march=znver1 -rdynamic

Bullet Physics Engine

Test: 136 Ragdolls

x86-64znver1OpenBenchmarking.orgSeconds, Fewer Is BetterBullet Physics Engine 2.81Test: 136 RagdollsClang 6.0GCC 8.00.7381.4762.2142.9523.69SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.01, N = 33.283.263.233.191. (CXX) g++ options: -O3 -march=znver1 -rdynamic

Bullet Physics Engine

Test: Prim Trimesh

x86-64znver1OpenBenchmarking.orgSeconds, Fewer Is BetterBullet Physics Engine 2.81Test: Prim TrimeshClang 6.0GCC 8.00.24750.4950.74250.991.2375SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 3SE +/- 0.00, N = 31.101.101.091.101. (CXX) g++ options: -O3 -march=znver1 -rdynamic

SciMark

Computational Test: Jacobi Successive Over-Relaxation

x86-64znver1OpenBenchmarking.orgMflops, More Is BetterSciMark 2.0Computational Test: Jacobi Successive Over-RelaxationClang 6.0GCC 8.0400800120016002000SE +/- 310.16, N = 4SE +/- 0.28, N = 4SE +/- 0.49, N = 4SE +/- 0.77, N = 41110.651423.141424.211676.621. (CC) gcc options: -O3 -march=znver1 -lm

SciMark

Computational Test: Dense LU Matrix Factorization

x86-64znver1OpenBenchmarking.orgMflops, More Is BetterSciMark 2.0Computational Test: Dense LU Matrix FactorizationClang 6.0GCC 8.09001800270036004500SE +/- 17.92, N = 4SE +/- 177.13, N = 4SE +/- 135.63, N = 4SE +/- 110.38, N = 43190.433513.114034.893678.861. (CC) gcc options: -O3 -march=znver1 -lm

SciMark

Computational Test: Fast Fourier Transform

x86-64znver1OpenBenchmarking.orgMflops, More Is BetterSciMark 2.0Computational Test: Fast Fourier TransformClang 6.0GCC 8.050100150200250SE +/- 45.12, N = 4SE +/- 0.35, N = 4SE +/- 0.38, N = 4SE +/- 0.14, N = 4179.29233.89226.68231.091. (CC) gcc options: -O3 -march=znver1 -lm

SciMark

Computational Test: Composite

x86-64znver1OpenBenchmarking.orgMflops, More Is BetterSciMark 2.0Computational Test: CompositeClang 6.0GCC 8.0400800120016002000SE +/- 36.18, N = 8SE +/- 20.51, N = 7SE +/- 25.95, N = 4SE +/- 20.36, N = 41479.531579.481699.321680.451. (CC) gcc options: -O3 -march=znver1 -lm

Timed HMMer Search

Pfam Database Search

x86-64znver1OpenBenchmarking.orgSeconds, Fewer Is BetterTimed HMMer Search 2.3.2Pfam Database SearchClang 6.0GCC 8.048121620SE +/- 1.28, N = 6SE +/- 1.74, N = 6SE +/- 0.12, N = 3SE +/- 0.04, N = 312.8513.6511.0912.401. (CC) gcc options: -O3 -march=znver1 -pthread -lhmmer -lsquid -lm

Phoronix Test Suite v10.8.4