Christopher Schultz wrote:
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Shanti,

On 10/10/12 2:55 PM, Shanti Suresh wrote:
I am also just curious how much active heap you are really using.
From the previous heapdumps the script generated, what size are
these? Was there a reason you needed a huge heap like 25GB?

Yes. In another thread, the OP stated that they store insane amounts
of stuff (like 10MiB+ worth) in sessions and need to support many
simultaneous sessions (the example was 3000).

The worst part about a heap dump like that is that it generates an
enormous file when the JVM crashes.


I know that this has nothing to do directly with the issue at hand, but I must say that ever since I saw that post, I have been wondering about the real need to keep such huge amount of data in memory "for efficiency". I make no judgment in advance, but when I am told something like that by one of our junior programmers, instinctively this triggers a reaction in me to dig further. Intuitively, the overhead of starting 3000 such sessions and just loading that data 3000 times should tend to negate any later efficiency advantage, no ?

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