As a start, you could enable native memory tracking in the JVM and see
if that tells you anything.
$ java -XX:NativeMemoryTracking=summary ...
$ jcmd <pid> VM.native_memory
If it doesn't, I would look closer at that native library and how it's used.
cheers,
Per
On 3/27/22 23:18, Stefan Reich wrote:
Oops, correction (sorry for spam) - these options aren't even used in
the process in question. It's -Xmx2g, and nothing else.
On Sun, 27 Mar 2022 at 23:17, Stefan Reich
<stefan.reich.maker.of....@googlemail.com
<mailto:stefan.reich.maker.of....@googlemail.com>> wrote:
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
<mailto: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
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