avx512counters

avx512counters

AVX-512 hardware counters collector written in Go, based on Go toolchain.

Overview

This program utilized Go 1.11 assembler AVX-512 support, extensive end2end test suite and Linux perf tool to build CSV that records some relevant hardware counter values associated with every available AVX-512 instruction form.

Output format

The output is printed in CSV format.

There are 6 columns:

1. extension is a extension this instruction form belongs to
2. instruction form is a combination of operands applied to specific opcode
3. class is a category this instruction form can reach
4. level0 shows core_power.lvl0_turbo_license hardware counter value
5. level1 shows core_power.lvl1_turbo_license hardware counter value
6. level2 shows core_power.lvl2_turbo_license hardware counter value

Example output line:

"avx512f","KANDNW K, K, K","turbo0","1249200","0","0"

The instruction form can have these argument classes:

• imm for immediate (const) argument
• K for opmask registers (K0-K7)
• X for 128-bit vector registers (X0-X31)
• Y for 256-bit vector registers (Y0-Y31)
• Z for 512-bit vector registers (Z0-Z31)
• mem for memory operands, including VSIB
• reg for scalar register operands like AX and CX

Example of the complete output is provided in avx512_core_i9_7900x.csv file.

Disclaimer: provided example is not a reliable reference. The results may vary between collector runs, execution on different machines may lead to other results as well.

Requirements

• Go 1.11 or above (AVX-512 support)
• Linux perf that recognizes core_power.lvl{0,1,2}_turbo_license events
• Intel CPU with at least avx512f

Hint: pmu-tools contains ocperf.py that can be used on systems with older perf that does not recognize required CPU events even if machine has them.

Usage

go get -u github.com/Quasilyte/avx512counters

The $GOPATH/bin is expected to be included into your system $PATH. If it's not, you may want to move installed binary somewhere where it will be accessible.

avx512counters -help output:

  -extensions string
    	comma-separated list of extensions to be evaluated (default "avx512f,avx512dq,avx512cd,avx512bw")
  -iformSpanSize uint
    	how many instruction lines form a single iform span. Higher values slow down the collection (default 100)
  -loopCount uint
    	how many times to execute every iform span. Higher values slow down the collection (default 1000000)
  -perf string
    	perf tool binary name. ocperf and other drop-in replacements will do (default "perf")
  -perfRounds uint
    	how many times to re-validate perf results. Higher values slow down the collection (default 1)
  -workDir string
    	where to put results and the intermediate files (default "./avx512counters-workdir")

The only thing you might want to adjust is extensions argument.

Suppose you're only interested in avx512f, then you can run avx512counters like this:

avx512counters -extension=avx512f | tee results.csv

The result CSV is printed to stdout. Collection status is printed to stderr.

Supported extensions:

• aes_avx512f
• avx512_4fmaps
• avx512_4vnniw
• avx512_bitalg
• avx512_ifma
• avx512_vbmi
• avx512_vbmi2
• avx512_vnni
• avx512_vpopcntdq
• avx512bw
• avx512cd
• avx512dq
• avx512er
• avx512f
• avx512pf
• gfni_avx512f
• vpclmulqdq_avx512f