my jira(jira instance A) crashes,and the following appears in the
2012-7-20 10:54:48 org.apache.catalina.core.ApplicationDispatcher invoke
Serious: Servlet.service() for servlet jsp threw exception
java.lang.OutOfMemoryError: Java heap space
1 increase JvmMs to 512 , JvmMx to 1024
2 service.bat remove
3 service.bat install
4 then resart jira
jira started but after few seconds,it down.i can no longer start jira
so i have to reset jvm parameters to its default value,JvmMs to 128,JvmMx to 512.
i find the following lines in setenv.bat file.
can't i increase the jvm values in serveice.bat lager than the values in setenv.bat file?
but in another jira instance B,i only set --JvmMs 256 --JvmMx 800 in service.bat,and it can successfully started.
jira A and jira B are all installed on the same server,and there are still 7433 MB physical memory available in this server.
jira A and jira B are of the same version,jira standalone 4.4.1.
i run three jira service on the same server before.and now only one jira is in using,i mean the other two are still running,but no one is using them.
and the using jira is now running normally,i.e. not often crash once a month,and should restart.
so i guess
Setting the -Xmx above the available amount on the server runs the risk of OutOfMemoryErrors due to lack of physical memory. If that occurs the system will use swap space, which greatly decreases performance.(https://confluence.atlassian.com/display/CONFKB/How+to+Fix+Out+of+Memory+Errors+by+Increasing+Available+Memory#HowtoFixOutofMemoryErrorsbyIncreasingAvailableMemory-guidance
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