05-25-2011
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.
That as a start.
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