> On Jan 5, 2024, at 16:21, Brian Braun <java08275...@gmail.com> wrote:
>>
>> Tracking native memory usage can be tricky depending upon your
>> environment. I would only look into that if there were somethng very odd
>> going on, like your process memory space seems to be more than 50% taken
>> by non-java-heap memory.
>>
> Well, actually that is my case. The heap memory (the 3 G1s) and non-heap
> memory (3 CodeHeaps + compressed class space + metaspace) together use just
> a few hundred MBs. I can see that using Tomcat Manager as well as the other
> monitoring tools. And the rest of the memory (about 1GB) is being used by
> the JVM but I don't know why or how, and that started 2 months ago. In your
> case you have just 20-25% extra memory used in a way that you don't
> understand, in my case it is about 200%.
The virtual map provided earlier doesn’t show any anomalies, but I really
should have asked you to run the pmap utility on the active Tomcat process
instead. The JVM heap that was active when you captured the data is this line:
c1800000-dda00000 rw-p 00000000 00:00 0
which works out to 115,200 pages or almost 472 Mb. However, we don’t know how
much of that virtual space was actually allocated in real memory. The pmap
utility would have shown that, as seen below for Tomcat running with a 512M
heap on my small Linux box. Having pmap output from your system, both before
and after the high-memory event occurs, might provide some insight on what’s
using up the real memory.
Are you using the Tomcat manager app to show memory information? This is a
quick way to display both maximum and used amounts of the various JVM memory
pools.
Below is the sample pmap output for my test system; the Kbytes and RSS columns
are of primary interest, notably the 527232 and 55092 for the JVM heap at
address 00000000e0000000. Finding the actual offender won’t be easy, but having
both before and after views may help.
- Chuck
26608: /usr/lib64/jvm/java-11-openjdk-11/bin/java
-Djava.util.logging.config.file=/home/chuck/Downloads/apache-tomcat-9.0.84/conf/logging.properties
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
-Djdk.tls.ephemeralDHKeySize=2048
-Djava.protocol.handler.pkgs=org.apache.catalina.webresources
-Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Xms512M -Xmx512M
-Dignore.endorsed.dirs= -classpath
/home/chuck/Downloads/apache-tomcat-9.0.84/bin/bootstrap.jar:/home/chuck/Downloads/apache-tomca
Address Kbytes RSS PSS Dirty Swap Mode Mapping
00000000e0000000 527232 55092 55092 55092 0 rw-p- [ anon ]
00000001002e0000 1045632 0 0 0 0 ---p- [ anon ]
0000561efff1e000 4 4 0 0 0 r--p-
/usr/lib64/jvm/java-11-openjdk-11/bin/java
0000561efff1f000 4 4 0 0 0 r-xp-
/usr/lib64/jvm/java-11-openjdk-11/bin/java
0000561efff20000 4 4 0 0 0 r--p-
/usr/lib64/jvm/java-11-openjdk-11/bin/java
0000561efff21000 4 4 4 4 0 r--p-
/usr/lib64/jvm/java-11-openjdk-11/bin/java
0000561efff22000 4 4 4 4 0 rw-p-
/usr/lib64/jvm/java-11-openjdk-11/bin/java
0000561f0095c000 264 68 68 68 0 rw-p- [ anon ]
00007f45d0000000 132 36 36 36 0 rw-p- [ anon ]
00007f45d0021000 65404 0 0 0 0 ---p- [ anon ]
00007f45d4000000 132 16 16 16 0 rw-p- [ anon ]
00007f45d4021000 65404 0 0 0 0 ---p- [ anon ]
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00007f45d8021000 65404 0 0 0 0 ---p- [ anon ]
00007f45dc000000 132 84 84 84 0 rw-p- [ anon ]
00007f45dc021000 65404 0 0 0 0 ---p- [ anon ]
00007f45e0000000 132 16 16 16 0 rw-p- [ anon ]
00007f45e0021000 65404 0 0 0 0 ---p- [ anon ]
00007f45e4000000 132 16 16 16 0 rw-p- [ anon ]
00007f45e4021000 65404 0 0 0 0 ---p- [ anon ]
00007f45e8000000 1340 1276 1276 1276 0 rw-p- [ anon ]
00007f45e814f000 64196 0 0 0 0 ---p- [ anon ]
00007f45ec000000 132 32 32 32 0 rw-p- [ anon ]
00007f45ec021000 65404 0 0 0 0 ---p- [ anon ]
00007f45f0000000 132 44 44 44 0 rw-p- [ anon ]
00007f45f0021000 65404 0 0 0 0 ---p- [ anon ]
00007f45f4000000 132 52 52 52 0 rw-p- [ anon ]
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00007f4600000000 132 88 88 88 0 rw-p- [ anon ]
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00007f4604000000 132 32 32 32 0 rw-p- [ anon ]
00007f4604021000 65404 0 0 0 0 ---p- [ anon ]
00007f4608000000 132 4 4 4 0 rw-p- [ anon ]
00007f4608021000 65404 0 0 0 0 ---p- [ anon ]
00007f460c000000 1080 1024 1024 1024 0 rw-p- [ anon ]
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00007f4610000000 132 4 4 4 0 rw-p- [ anon ]
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/run/nscd/dbYMrubY (deleted)
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---------------- ------- ------- ------- ------- -------
total kB 4145136 164976 301201 140936 152
