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From: Jonathan Ellis <jbellis@gmail.com>
Date: Wed, 9 Mar 2011 11:36:36 -0600
Message-ID: <AANLkTik9Earzo2mGkKsqckxxoQdOY=iu299u+G=5=9D2@mail.gmail.com>
Subject: Re: Reducing memory footprint
To: user@cassandra.apache.org
Cc: Casey Deccio <casey@deccio.net>
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I edited Peter Schuller's reply last time this came up into a FAQ:
http://wiki.apache.org/cassandra/FAQ#mmap

On Wed, Mar 9, 2011 at 11:10 AM, Casey Deccio <casey@deccio.net> wrote:
> On Sat, Mar 5, 2011 at 7:37 PM, aaron morton <aaron@thelastpickle.com>
> wrote:
>>
>> There is some additional memory usage in the JVM beyond that Heap size, =
in
>> the permanent generation. 900mb sounds like too much for that, but you c=
an
>> check by connecting with JConsole and looking at the memory tab. You can
>> also check the heap size there to see that it's under the value you've s=
et.
>
> Thanks for the tip!
>
> From JConsole:
> Heap memory usage: Current 46M; Max 902M
> Non-Heap memory usage: Current 34M; Max 200MB
>
> Both of these seem reasonable and don't reach the (current) 2.1 GB reside=
nt
> usage I am seeing.
>
>> Check you are using standard disk access (in conf/cassandra.yaml) rather
>> than memory mapped access. However the memory mapped memory is reported =
as
>> virtual memory, not resident. So I'm just mentioning it to be complete.
>
> At the moment, it's set to "auto", but it's a 64-bit machine, so I believ=
e
> it's using memory mapped.=A0 The virtual memory usage says that it is 54.=
6 GB.
>
>> If you think you've configured things correctly and the JVM is not
>> behaving (which is unlikely) please include some information on the JVM =
and
>> OS versions and some hard numbers about what the process is using.
>
> Debian 6.0 using openjdk-6-jre-lib-6b18-1.8.3-2+squeeze1
>
> Thanks for your help.
>
> Casey
>


--=20
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com