Any Additional Steps After Adding New RAM To Sever?
Hi All,
We have a server at a client site running AIX 5.3, which we just up the RAM to 32GB, from initially 16GB (if I'm not mistaken).
This server is our Application server running J2EE applications on top of Oracle Internet Application Server. Recently we encountered one of the batch jobs hitting out of memory error.
From NMON I see that on average, there's 5GB of free memory available. %MAXPERM is set to '15' and %MINPERM is '5'. lru_file_repage is '0'. %comp is around '70' and %numperm is '15'.
I would like to ask
a) after adding real memory to the server, is there any additional changes we need to do to the VMO?
b) is the %MAXPERM too low?
a)
Usually not - many parameters regarding memory are percentage based. Others have fixed values. When doubling the memory it should usually run smoother than before if there was a memory shortage or no tuning.
b)
Not easy to say this way. When using lru_file_repage=0, it is recommended to have maxperm% back to 80 which is default and depending on memory usage, some do even set 85 or 90.
A box running out of memory will usually start to page out, before anything crashes, and sowith become very slow. I heared once that Java dislikes to be paged out - not sure if this is true or still a problem though. It could also be that you can increase memory usage inside your application server (I am not very familiar with java but heapsize stuff etc. come to my mind), especially after having added real memory.
Post a vmstat -vs and a svmon -G. It could also be, that the ulimits for the user where this application is running, has too tight limits. A ulimit -a issued from that user will show the current limits.
This looks like a Java memory error. Maybe check with your application server if you can set parameters for memory pools/heapsize (whatever there is and they are called) etc. to a higher value. This does not look like a problem with the OS.
Hmm... Is there a reason why memory usage for the application is limited?
Looking at the other data it seems to be quite ok, but the tuning parameters would be interesting to know to effectively assess the situation. Please post the output of "vmo -a", "ioo -a" and "schedo -a".
The numbers in the "vmstat -vs" output are collected since last reboot. What was the uptime of the system when you issued the command? Would it be possible to reboot the system to start over these statistics?
Good point - I should sometimes read what my eyes see If possible and nothing else running on this box, set this for the user to -1 (unlimited) and logoff/logon and restart the application with the new limits. That could be the problem indeed.
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