tips.txt 2.0 KB

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  1. For a higher level overview, try: perf report --sort comm,dso
  2. Sample related events with: perf record -e '{cycles,instructions}:S'
  3. Compare performance results with: perf diff [<old file> <new file>]
  4. Boolean options have negative forms, e.g.: perf report --no-children
  5. Customize output of perf script with: perf script -F event,ip,sym
  6. Generate a script for your data: perf script -g <lang>
  7. Save output of perf stat using: perf stat record <target workload>
  8. Create an archive with symtabs to analyse on other machine: perf archive
  9. Search options using a keyword: perf report -h <keyword>
  10. Use parent filter to see specific call path: perf report -p <regex>
  11. List events using substring match: perf list <keyword>
  12. To see list of saved events and attributes: perf evlist -v
  13. Use --symfs <dir> if your symbol files are in non-standard locations
  14. To see callchains in a more compact form: perf report -g folded
  15. Show individual samples with: perf script
  16. Limit to show entries above 5% only: perf report --percent-limit 5
  17. Profiling branch (mis)predictions with: perf record -b / perf report
  18. Treat branches as callchains: perf report --branch-history
  19. To count events in every 1000 msec: perf stat -I 1000
  20. Print event counts in CSV format with: perf stat -x,
  21. If you have debuginfo enabled, try: perf report -s sym,srcline
  22. For memory address profiling, try: perf mem record / perf mem report
  23. For tracepoint events, try: perf report -s trace_fields
  24. To record callchains for each sample: perf record -g
  25. To record every process run by an user: perf record -u <user>
  26. Skip collecing build-id when recording: perf record -B
  27. To change sampling frequency to 100 Hz: perf record -F 100
  28. See assembly instructions with percentage: perf annotate <symbol>
  29. If you prefer Intel style assembly, try: perf annotate -M intel
  30. For hierarchical output, try: perf report --hierarchy
  31. Order by the overhead of source file name and line number: perf report -s srcline
  32. System-wide collection from all CPUs: perf record -a
  33. Show current config key-value pairs: perf config --list
  34. Show user configuration overrides: perf config --user --list