If your Nginx is compiled with debug symbols you may see some useful info `perf top`
On Mon, Aug 12, 2024, 6:24 PM Brad Patton <b...@wordkeeper.com> wrote: > Hi all, > > About 2 months ago the CPU usage on 1 of our servers started going crazy. > All of a sudden, Nginx itself started using about 6x the CPU power to serve > requests with no increase in traffic at all. It's a dramatic difference > and it's directly attributed to Nginx, not PHP, Mariadb, or anything else. > I can show you a lot of graphs and data showing the problem if needed so > let me know if you would like to see more. 🙂 > > The only OS updates during the week prior to the issue starting were to > PHP. We're currently running Nginx version 1.27.0 and we were on 1.25.5 > when it started. In addition to those updates, we've run several test > builds where we disabled certain modules just randomly trying to isolate > the issue. > > I was starting to think that the issue had something to do with our > configuration, even though that didn't change at the start of the issue > either, but then I ran a test in a Fedora 40 container and it solved the > problem. Unfortunately, I could only run that test temporarily, but the > results were clear. The same exact build with the same exact configuration > works fine in Fedora 40 but takes about 6x the CPU power to serve the same > requests in Centos Stream 9. > > That makes me think there is either some bug in Centos 9 or a bug in Nginx > that only happens in Centos 9. Does anyone have any thoughts on how to > find out exactly what in Nginx is causing the much higher CPU usage? > > If not, would you like to see more information about the problem? If so, > what? > > Thanks! > Brad > > _______________________________________________ > nginx mailing list > nginx@nginx.org > https://mailman.nginx.org/mailman/listinfo/nginx >
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