GCC -O2 Regression

Intel Xeon Silver 4216 testing with a TYAN S7100AG2NR (V4.02 BIOS) and ASPEED on Debian 10 via the Phoronix Test Suite.

HTML result view exported from: https://openbenchmarking.org/result/2007271-NE-GCCO2REGR41.

GCC -O2 RegressionProcessorMotherboardChipsetMemoryDiskGraphicsAudioNetworkOSKernelDesktopDisplay ServerCompilerFile-SystemScreen ResolutionGCC 11.0.0 20200727GCC 10.2.0GCC 9.3.0Intel Xeon Silver 4216 @ 3.20GHz (16 Cores / 32 Threads)TYAN S7100AG2NR (V4.02 BIOS)Intel Sky Lake-E DMI3 Registers24GB240GB Corsair Force MP500ASPEEDRealtek ALC8922 x Intel I350Debian 104.19.0-9-amd64 (x86_64)GNOME Shell 3.30.2X ServerGCC 11.0.0 20200727ext41024x768GCC 10.2.0GCC 9.3.0OpenBenchmarking.orgEnvironment Details- CXXFLAGS=-O2 CFLAGS=-O2Compiler Details- --disable-multilib --enable-checking=releaseProcessor Details- Scaling Governor: intel_pstate powersave - CPU Microcode: 0x500002cSecurity Details- 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 usercopy/swapgs barriers and __user pointer sanitization + spectre_v2: Mitigation of Enhanced IBRS IBPB: conditional RSB filling + srbds: Not affected + tsx_async_abort: Mitigation of TSX disabled

GCC -O2 Regressionscimark2: Compositescimark2: Sparse Matrix Multiplyscimark2: Dense LU Matrix Factorizationcoremark: CoreMark Size 666 - Iterations Per SecondGCC 11.0.0 20200727GCC 10.2.0GCC 9.3.01467.192278.142985.83413969.5486971404.911977.322981.53440038.2007381585.122607.123251.71445965.550606OpenBenchmarking.org

SciMark

Computational Test: Composite

OpenBenchmarking.orgMflops, More Is BetterSciMark 2.0Computational Test: CompositeGCC 11.0.0 20200727GCC 10.2.0GCC 9.3.030060090012001500SE +/- 0.76, N = 3SE +/- 0.23, N = 3SE +/- 3.10, N = 31467.191404.911585.121. (CC) gcc options: -O2 -lm

SciMark

Computational Test: Sparse Matrix Multiply

OpenBenchmarking.orgMflops, More Is BetterSciMark 2.0Computational Test: Sparse Matrix MultiplyGCC 11.0.0 20200727GCC 10.2.0GCC 9.3.06001200180024003000SE +/- 0.22, N = 3SE +/- 0.70, N = 3SE +/- 3.22, N = 32278.141977.322607.121. (CC) gcc options: -O2 -lm

SciMark

Computational Test: Dense LU Matrix Factorization

OpenBenchmarking.orgMflops, More Is BetterSciMark 2.0Computational Test: Dense LU Matrix FactorizationGCC 11.0.0 20200727GCC 10.2.0GCC 9.3.07001400210028003500SE +/- 3.25, N = 3SE +/- 0.12, N = 3SE +/- 6.37, N = 32985.832981.533251.711. (CC) gcc options: -O2 -lm

Coremark

CoreMark Size 666 - Iterations Per Second

OpenBenchmarking.orgIterations/Sec, More Is BetterCoremark 1.0CoreMark Size 666 - Iterations Per SecondGCC 11.0.0 20200727GCC 10.2.0GCC 9.3.0100K200K300K400K500KSE +/- 2874.84, N = 3SE +/- 3482.62, N = 3SE +/- 179.10, N = 3413969.55440038.20445965.551. (CC) gcc options: -O2 -lrt" -lrt

Phoronix Test Suite v10.8.4