Quick follow-up: The only GC-related command line options I use are -XX:MaxHeapFreeRatio=20 -XX:MinHeapFreeRatio=10 -XX:+UseStringDeduplication
On Sun, 27 Mar 2022 at 23:14, Stefan Reich < stefan.reich.maker.of....@googlemail.com> wrote: > Hi, I am currently running OpenJDK 16 on my server (will upgrade to 17 > when I'm sure none of my code is dependent on illegal accesses). OS is > Ubuntu 18. > > I am noticing that a long running server process eventually (after a few > days) grows enormously in its resident size. Right now it is at 7 GB. > Performing a GC doesn't get it any lower. > > The weird part is that the process is run with -Xmx2g, and currently used > heap according to java.lang.Runtime is only 400 MB after GC, going up to at > most 1 GB in operation. > > How do these numbers fit together? > > I've seen the resident size even higher (13+ GB), and at that point I > noticed the process getting significantly slower too (web pages taking 1-2 > seconds to load instead of near instant). > > At a typical moment in time, no Java threads are running (I monitor this > every second). > > An obvious suspect is of course any native library loaded. The only native > library in use is, I think, the OSHI library. > > Any ideas why this might be happening? > > Many greetings, > Stefan > > -- > == Gaz.AI == > -- == Gaz.AI ==
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