perf-runner.md

CI benchmarking machine

The machine that actually executes the benchmarks in CI has the following configuration.

Hardware

• 6-core AMD Ryzen 5 3600 with HyperThreading (12 hardware threads total)

  Output of `lscpu`

  Architecture:        x86_64
  CPU op-mode(s):      32-bit, 64-bit
  Byte Order:          Little Endian
  CPU(s):              12
  On-line CPU(s) list: 0-11
  Thread(s) per core:  2
  Core(s) per socket:  6
  Socket(s):           1
  NUMA node(s):        1
  Vendor ID:           AuthenticAMD
  CPU family:          23
  Model:               113
  Model name:          AMD Ryzen 5 3600 6-Core Processor
  Stepping:            0
  CPU MHz:             3819.020
  CPU max MHz:         3600.0000
  CPU min MHz:         2200.0000
  BogoMIPS:            7186.58
  Virtualization:      AMD-V
  L1d cache:           32K
  L1i cache:           32K
  L2 cache:            512K
  L3 cache:            16384K
  NUMA node0 CPU(s):   0-11
  Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate sme ssbd ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 cqm rdt_a rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local clzero irperf xsaveerptr arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif umip rdpid overflow_recov succor smca
  

• 64 GiB RAM, 32 GiB of swap

Software

• Kernel: 4.15.0-191-generic
• OS: Ubuntu 18.04

Configuration

HyperThreading & Turboboost

As of November 2022, both are disabled.

Prior to October 2022, both were enabled. During October 2022 some experimentation was done which found that disabling both reduced variance significantly.

CPU scaling

Scaling governor set to performance.

ASLR (Address Space Layout Randomization)

Disabled with kernel.randomize_va_space=0 in sysctl.conf.

Note that ASLR is also disabled explicitly when gathering performance metrics.

NMI watchdog

Disabled with kernel.nmi_watchdog=0 in sysctl.conf.

Swap

vm.swappiness set to 60.