Jira / JVM memory usage

Question

Hi,

i installed JIRA on Ubuntu 10.04 64 bit. It works fine.

I set 256m for JVM_MINIMUM_MEMORY, JVM_MAXIMUM_MEMORY and JIRA_MAX_PERM_SIZE.

256 + 256 = 512. Why takes a plain jira installation with this settings so much memory (like below)?

PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
17665 jira      25   0 1127m 830m  15m S  0.0 40.5   1:49.33 java

Radek Karaffa · Answer

YES! Why JIRA core occupy 800+MB of ram and System->System info lie about 248MB ?!??!

I really not need for my small one project with ~300 issues this hungry app... Where rest of RAM is lost?!?!? For good heap size, app eat about 1,2GB RAM .. from my 4G mini-server with many other small daemons...

Hey, Atlassian, stop to "make bussines" and do some reaction on this!

Thanks...

PS: more than 4 years and not any reaction from Atlassian ... too bad ...

Norman Abramovitz · Answer

Java is very heavy on memory usage.  It has been my experience whatever memory you give the Java's JVM it will use it up.   It all depends on when the jvm does its garbage colection and if the java code is written correctly to allow memory to be released.

You want to watch the working set size since that is closer to the actual memory being used.

If you can, I would assume 1.5G to 2G of memory will be normal for most Jira installations.

Richard Klawon · Answer

I've got a similar problem.

I refer to http://confluence.atlassian.com/display/JIRA/JIRA+Requirements.

During evaluation, JIRA will run well on any reasonably fast workstation computer (e.g. 1.5+ Ghz processor). Memory requirements depend on how many projects and issues you will store, but 300MB – 1GB (of Java heap size) is enough for most evaluation purposes.

[...] If you are planning to have a small number of projects (10-20) with 1,000 to 5,000 issues in total and about 100-200 users, a recent server (2.0+ GHz quad core CPU) with 1-2 GB of available RAM should cater for your needs.

[...] We have reports that allocating 1GB of RAM to JIRA is sufficient for 100,000 issues

[...] For reference, our http://jira.atlassian.com site has over 125,000 issues and over 70,000 user accounts. The system runs on a server with a 64-bit quad core processor and 32 GB of memory, of which only 1.5 GB is allocated to JIRA.

I dont know how this should work. A fresh installation (max memory 512 + 256 perm) on a out-of-the-box ubuntu (minimal) takes up to 1.2gb ten minutes after start (with browsing through jira, but no created projects, etc.)...