On 9/3/2011 1:15 PM, Darius D. wrote:
n828cl wrote:
From: Darius D. [mailto:darius....@gmail.com]
Subject: Re: Performance for many small requests
in my opinion using 64bit JVM with such a small
heap is only needed if performance testing shows
gains versus 32bit JVM.
The main advantage of using a 64-bit JVM is the increased number of
registers available in the x86-64 architecture, which can result in vastly
reduced memory references. Whether or not that's important to overall
performance is highly dependent on the application, of course.
Yeah, but I'd err on 32bit JVM side :) Gains from more registers are very
specific, but penalty from increased cache/TLB misses is big, and if you
start hitting hard page faults ( that would have been avoidable due to lower
heap size with 32bit JVM ) - even one of those will erase all gains :)
Then why shouldn't I just double my heap size? Wouldn't that eliminate
the risk of increased cache misses? I was just using the settings from
my 32-bit installation, but have plenty of RAM to allow me to increase
the memory settings if that would help.
Dave
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