Hi. 

I have several Filr Appliances at customers, pretty much in default config (20GB memory, 9GB Java memory heap), which eventually run out of memory. Further checking reveals, that Java itself is consuming virtually all the VMs memory (18-19GB).

Here's some excerpt from PMAP. Too much to post in full here, but there's no obvious offender, just thousands and thousands of small memory allocations that add up to almost 10G:

1793:   /usr/lib64/jvm/java/bin/java -Djava.util.logging.config.file=/opt/novell/filr/apache-tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.awt.headless=true -Dibmjdkonly.javax.xml.transform.TransformerFactory=org.apache.xalan.processor.TransformerFactoryImpl -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Xms9g -Xmx9g -Xss2m -XX:MaxMetaspaceSize=512m
Address           Kbytes     RSS     PSS   Dirty    Swap Mode  Mapping
00000005c0000000 9458764 9458716 9458716 9458712       0 rw-p-   [ anon ]
0000000801513000  494516       0       0       0       0 ---p-   [ anon ]
0000555fed3b9000       4       0       0       0       0 r-xp- /usr/lib64/jvm/java-11-openjdk-11/bin/java
0000555fed3ba000       4       4       4       4       0 r--p- /usr/lib64/jvm/java-11-openjdk-11/bin/java
0000555fed3bb000       4       0       0       0       4 rw-p- /usr/lib64/jvm/java-11-openjdk-11/bin/java
0000555fee209000  115008  114824  114824  114824      92 rw-p-   [ anon ]
00007f67256ac000      16       0       0       0       0 ---p-   [ anon ]
00007f67256b0000    2036      16      16      16       0 rw-p-   [ anon ]
00007f67290c9000      16       0       0       0       0 ---p-   [ anon ]
00007f67290cd000    2036     116     116     116       0 rw-p-   [ anon ]
00007f67292ca000      16       0       0       0       0 ---p-   [ anon ]
00007f67292ce000    2036     116     116     116       0 rw-p-   [ anon ]
00007f6738d27000      16       0       0       0       0 ---p-   [ anon ]
00007f6738d2b000    2036      32      32      32       0 rw-p-   [ anon ]
00007f6738f28000      16       0       0       0       0 ---p-   [ anon ]