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From Jeff Sturm <jeff.st...@eprize.com>
Subject RE: Performance for many small requests
Date Sat, 03 Sep 2011 20:55:54 GMT
> -----Original Message-----
> From: Darius D. [mailto:darius.ski@gmail.com]
> Sent: Saturday, September 03, 2011 1:36 PM
> 
> As a side note - (CPU)cache/TLB misses have nothing to do with heap size.
> Too big heap size can be as bad as too low ( by stealing memory from OS that could
> have been used for file caches and other apps and increasing GC pauses ).

The Linux JVM has a nice option -XX:+UseLargePages to help avoid TLB misses on heap accesses.
 It's good for modest gains, and has the side effect of locking the heap into memory.  I tend
to use it on systems with large heaps.

Not much you can do about cache misses though, besides getting processors with more cache.

-Jeff



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