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HBase, mail # user - GC and High CPU


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Re: GC and High CPU
Jack Levin 2011-05-17, 03:30
I think in our case we have a deadlock of not cleaning garbage in large
enough  chunks;  being stuck in high cpu is as good as being dead

Jack
On May 16, 2011 4:41 PM, "Andrew Purtell" <[EMAIL PROTECTED]> wrote:
> This is interesting because our "conventional wisdom" is those settings
should increase the chance of stop-the-world GC and should be avoided.
>
> - Andy
> (who always gets nervous when we start talking about GC black magic)
>
>> From: Jack Levin <[EMAIL PROTECTED]>
>> Subject: Re: GC and High CPU
>> To: [EMAIL PROTECTED]
>> Date: Monday, May 16, 2011, 5:06 PM
>>
>> Those are the lines I added:
>>
>> -XX:+CMSIncrementalMode \  <--------
>> -XX:+CMSIncrementalPacing \ <-------
>> -XX:-TraceClassUnloading <------
>>
>> -Jack
>> (used CMS before)
>>
>> On Mon, May 16, 2011 at 4:19 PM, Stack <[EMAIL PROTECTED]>
>> wrote:
>> > So, the change is that you started using CMS?  You
>> > were using the default GC previous?
>> >
>> > ParNew is much bigger now.
>