ref: bedac6438461449392694dd8c4a7028ccdc46019
dir: docs.9front.org/prof.md
# prof(1) Prof(1) is a profiling tool. The man page was a little ambiguous to me, so here's some examples of how to use it. First, in your mkfile, add `LDFLAGS=-p` after the inclusion of mkone, as per `/sys/doc/mkfiles.ps`. Compile. Run, and your program will spit out a `prof.pid` file. If your program complains about a prof error, increase the profsize variable as per the man page, or else the prof file will be incorrect. Then, run `prof 6.out prof.pid`, substituting whatever your program or prof file are named. This should spit out call frequencies. `prof -dr 6.out prof.pid` will spit out a HUGE call tree. Get only the important parts (the ones that take >1ms) with regex char classes: `prof -dr 6.out prof.pid | grep '[a-z]:[1-9]'` Happy profiling :)