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From Daning <>
Subject Re: Lots of GC in log
Date Thu, 22 Sep 2011 22:39:06 GMT
Thanks Peter. I saw cpu was shooting much higher. I am not sure if 
frequent GCs are caused by improperly sized generations. I'd like to get 
some tunning tips, or good document about Cassandra tuning.


On 09/22/2011 12:23 PM, Peter Schuller wrote:
>> We are testing Cassandra with pretty big load, I saw frequent GCs in the
>> log, Do you have suggestion about how to reduce them?
> Do you have any actual problem that you are observing?
> Frequent young-generation GC:s (ParNew) are expected. If you want to
> cut down on the length of them you may want to change the JVM settings
> in to use a smaller young-gen, but that will probably
> cause overall GC cost to go up as more data is promoted into old gen.

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