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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: JVM Options for Production
Date Wed, 16 Jun 2010 02:56:56 GMT
The main change you'd commonly make is decreasing the max new gen size
on large heaps (say to 2GB) from the default of 1/3 of the heap.

IMO keeping heap dump on OOM around is a good idea in production; it
doesn't cost much (you're already screwed at the point where it starts
writing a dump, so why not) and it can be useful.

On Mon, Jun 14, 2010 at 6:01 PM, Anthony Molinaro
<anthonym@alumni.caltech.edu> wrote:
> Hi,
>
>  I was updating to a newer 0.6.3 and happened to remember that I noticed
> back in 0.6.2 there's this change in CHANGES.txt
>
>  * improve default JVM GC options (CASSANDRA-1014)
>
> Looking at that ticket, I don't actually see the options listed or a
> reason for why they changed.  Also, I'm not certain which options are
> now recommended for a production system versus what's in the distribution.
>
> The distribution (well svn) for 0.6.x currently has
>
> JVM_OPTS=" \
>        -ea \
>        -Xms256M \
>        -Xmx1G \
>        -XX:+UseParNewGC \
>        -XX:+UseConcMarkSweepGC \
>        -XX:+CMSParallelRemarkEnabled \
>        -XX:SurvivorRatio=8 \
>        -XX:MaxTenuringThreshold=1 \
>        -XX:+HeapDumpOnOutOfMemoryError \
>        -Dcom.sun.management.jmxremote.port=8080 \
>        -Dcom.sun.management.jmxremote.ssl=false \
>        -Dcom.sun.management.jmxremote.authenticate=false"
>
> Now I would assume that for 'production' you want to remove
>   -ea
> and
>   -XX:+HeapDumpOnOutOfMemoryError
>
> as well as adjust -Xms and Xmx accordingly, but are there any others
> which should be tweaked?  Is there actually a recommended production
> set of values or does it very greatly from installation to installation?
>
> Thanks,
>
> -Anthony
>
> --
> ------------------------------------------------------------------------
> Anthony Molinaro                           <anthonym@alumni.caltech.edu>
>



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com

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