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From Mark Greene <green...@gmail.com>
Subject Re: is there any suggestion for tuning cassandra for the best performance?
Date Wed, 07 Apr 2010 12:05:45 GMT
This question is probably better served for the users list, not the dev
list.

JVM tuning is mainly based on the application profile. For example, if you
have a lot of columns that have a decent amount of data in them, the node
will require more memory to do compactions. But if you give it to much
memory, say 6Gigs, GC's could take a to long and slow down your throughput
considerably. It's really about finding the sweet spot for your particular
application. Start with 1G max and work you way up if you need to. Some
people prefer more nodes with smaller heaps rather than fewer nodes with
larger heaps.

-Mark

2010/4/7 Bingbing Liu <rucbing@gmail.com>

> such as :
> the XMX for jvm ? -the default XMX is 1G
> the RpcTimeoutInMills?
> ConcurrentReads´╝č
> ConcurrentWrites´╝č
>
> is there any rules ? such as "when the xmx is set to *% of the size of  the
> physical memory , the performance is the best"
>
>
>
>
> 2010-04-07
>
>
>
> Bingbing Liu
>

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