What are your JVM settings (heap and GC)? wunder Walter Underwood [email protected] http://observer.wunderwood.org/ (my blog)
> On Sep 2, 2021, at 8:28 AM, Dominic Humphries <[email protected]> > wrote: > > We're trying to upgrade from 8.3.1 to 8.8.1 but my pre-release testing has > shown us some performance issues. Examination of the GC log shows that the > possible cause may be here: > > 8.3.1 graphs: https://imgur.com/a/ZM9wdob > 8.8.1 graphs: https://imgur.com/a/UzMinwJ > > The test cycle here is 2 mins with requests; 2 mins no requests; 2 mins > requests. You can see the 8.3 gives what I'd expect - fairly consistent > heap usage, fairly fast & consistent GC durations. > 8.8 however shows steadily increasing heap usage in the first request cycle > and a big spike in one of the GC durations. > > This broad pattern repeats - with sometimes more than one slow GC operation > for 8.8 - reliably each time I test. Is there any setting that might have > been configured badly that could cause this? Or is it a bug? > > Thanks > > Dominic
