Thank you, Ian. From the function names, I suspected that the 70% chain was the garbage collector. But in this run, garbage collection was turned off with GOGC=off, and that was verified with GODEBUG=gctrace=1. So I thought perhaps they must be something else.
I will proceed with heap profiling as you suggest. (And of course I've reviewed pprof blog post many times.) Regards, Steve On Wed, Jan 12, 2022 at 2:58 PM Ian Lance Taylor <i...@golang.org> wrote: > On Wed, Jan 12, 2022 at 1:54 PM Steve Roth <st...@rothskeller.net> wrote: > > > > I am attempting to profile my code, and I'm unable to interpret the > results. So first, the meta-question is, what's the best forum to use to > request help with such things? > > This is a good place. See also https://golang.org/wiki/Questions. > > > > The chain that is taking 70% of the time is > > > > gcBgMarkWorker > > > > systemstack > > > > gcBgMarkWorker.func2 > > > > gcDrain > > > > markroot > > > > markroot.func1 > > > > suspendG > > This is the concurrent garbage collector. > > > > The chain that is taking 17% of the time is > > > > mcall > > > > park_m > > > > schedule > > > > findrunnable > > > > stopm > > > > mPark > > > > notesleep > > > > futexsleep > > > > futex > > > > Again I have no clue what this is doing. Any guidance is welcome, > including pointers to other forums better suited for such questions. > > This is the goroutine scheduler. > > If your program is CPU bound (as it should be based on your > description) then 70% in the garbage collector is a lot. The next > step is to collect a heap profile to see where the memory is being > allocated. You may want to look at https://go.dev/blog/pprof, old but > still valid. > > Ian > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CAAnpqKGzr4MNfnC4Tqam2NoOt9AJ4NKP_Hiarv5usaYQYG1iNw%40mail.gmail.com.
