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From "Cristian" ...@nightwish.eu.org>
Subject heap size problems (speed)
Date Mon, 28 Nov 2005 09:52:08 GMT
Hello,

 I have an instance of tomcat with APR support which is set to allocate
more heap memory than default (by passing -Xmx512M option to JAVA_OPTS
in catalina.sh).

 Under this instance runs a test application which gets data from a
database and makes a cache with the fetched data (around 350M). When the
app is accessed it is supposed to return data from the cache (which is
in a form of a hashmap) faster than getting it from the database.

After the caching is done the application responds extremely slow and
above this many images aren't loaded or they are loaded partially in the
browser (I haven't checked to see if the images are the only ones that
are not loaded).

The system:
= Kernel: Linux server2 2.6.14-1.1637_FC4 #1 Wed Nov 9 18:19:37 EST 2005
i686 athlon i386 GNU/Linux

= Processor: AMD Duron 1000MHz

= Tomcat: 5.5.12 with APR 1.2.2 (compiled apart from apr-0.9.6-3.1 which
is in the distrib)

= RAM: 1G


The system has all updates.

I am not the one who wants the test so don't blame me for any stupidity
that you might found in this scenario :).

I get the same results on a different machine which is much faster and
has twice as much memory than this one from the test.

Thanks,
Cristian




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