Richard V. wrote: > > Hi XWiki users, > > I have encountered a problem where after running XWiki on my tomcat server > for a week, i get an java.lang.OutOfMemoryError: PermGen space error. It > appears that xwiki consumed all the java heap space. I believe the problem > may be related to unreleased DB connections because, I noticed that everytime > I try to shutdown tomcat, it hangs with xwiki deployed, also by running "ps > aux" i see the postgresql connection processes belonging to xwiki still > running. I tried deploying another application that uses hibernate + > postgresql on the same tomcat running xwiki, and upon shutting down the > server, all db connection processes from the other application gracefully > terminate but not the ones from xwiki. > > My question is does anyone ever had this problem before? If so what is the > solution? > Solutions that I have tried but did NOT work: > 1- Increase java heap with -Xmx512m > 2- Reduce the maximum and minimum idle DB connections > > My system specs: > > OS: Linux ubuntu kernel 2.6.20 > Java: 1.6.0_05-13 > Xwiki: 1.4 (binary distribution) > Posgresql: 8.2.6 > Total RAM: 1Gb >
AFAIK, there isn't a leak, but a somewhat "normal" behavior caused by the cache settings. The cache is configured to be a fixed size LRU cache, so if you store large entries in the cache, they will be kept there. The OOM error appears mostly when there are large attachments in the database. You should either reduce the size of the attachment cache or increase the memory. The shutdown problem is a different thing, it doesn't have anything to do with the database connections. I think it is because of some threads we're spawning that don't receive the shutdown message (the quartz scheduler for example). A memory leak regarding DB connections would mean there are thousands of open connections to the database, but I am pretty sure that's not the case, right? So, the main question is: Are there many & pretty large attachments in the wiki? -- Sergiu Dumitriu http://purl.org/net/sergiu/ _______________________________________________ users mailing list users@xwiki.org http://lists.xwiki.org/mailman/listinfo/users
