It is contending with sql.rows.awaitDone(). My guess is that when you close rows it has to wait for db acknowledgement - that this is a false positive based on wall time and not cpu time - that the mutex is waiting for the cleanup operation to complete.
> On Dec 13, 2023, at 1:25 PM, Joshua Garnett <josh.garn...@gmail.com> wrote: > > Hi All, > > Has anyone else observed significant mutex contention in sql.Close() at > scale? I haven't had much success working around it beyond spinning up > additional nodes. > > App details > Go 1.21.4 > debian:bookworm container > App is running on an instance with 18 physical cores (36 vCPU) and 72GB of > memory (only main process running) > Connecting to PostgreSQL 15.3 AWS Aurora > MaxOpenConns set to 125 > Here is a screenshot of the pprof: > > <Screenshot 2023-12-13 at 2.08.47 PM.png> > > Thanks in advance! > > --Josh > > > > -- > 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 > <mailto:golang-nuts+unsubscr...@googlegroups.com>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/CAJAXYdi2A-rJ9YhbJJB0a1TE_MbrHL2rMOSKP1Rb%3DxHc9dOveQ%40mail.gmail.com > > <https://groups.google.com/d/msgid/golang-nuts/CAJAXYdi2A-rJ9YhbJJB0a1TE_MbrHL2rMOSKP1Rb%3DxHc9dOveQ%40mail.gmail.com?utm_medium=email&utm_source=footer>. -- 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/0A3D8BF0-0062-40D7-B84E-E9397F935EB2%40ix.netcom.com.
