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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: 0.6 insert performance .... Re: [RELEASE] 0.6.1
Date Mon, 19 Apr 2010 21:56:39 GMT
Definitely let us know if you find that changing the GC options helps.
 We have tried to get some of the low-hanging fruit there but nobody
has put serious effort into tuning it.

FWIW, Chris Goffinet tested using ArrayBlockingQueue instead of LBQ in
https://issues.apache.org/jira/browse/CASSANDRA-896 but the higher
contention outweighed the benefits of creating less garbage.

-Jonathan

On Mon, Apr 19, 2010 at 4:46 PM, Masood Mortazavi
<masoodmortazavi@gmail.com> wrote:
> Minimizing GC pauses or minimizing time slots allocated to GC pauses --
> either through configuration or re-implementations of garbage collection
> "bottlenecks" (i.e. object-generation "bottlenecks") -- seem to be the
> immediate approach. (Other approaches appear to be more intrusive.)
> At code level, using the GC logs, one can investigate further. There may be
> places were some object recycling can make some larger difference.
> Trying this first will probably bear more immediate fruit.
>
> - m.
>
> On Mon, Apr 19, 2010 at 9:11 AM, Daniel Kluesing <dk@bluekai.com> wrote:
>
>>  We see this behavior as well with 0.6, heap usage graphs look almost
>> identical. The GC is a noticeable bottleneck, we’ve tried jdku19 and jrockit
>> vm’s. It basically kills any kind of soft real time behavior.
>>
>>
>>
>> *From:* Masood Mortazavi [mailto:masoodmortazavi@gmail.com]
>> *Sent:* Monday, April 19, 2010 4:15 AM
>> *To:* user@cassandra.apache.org; dev@cassandra.apache.org
>> *Subject:* 0.6 insert performance .... Re: [RELEASE] 0.6.1
>>
>>
>>
>> I wonder if anyone can use:
>>
>>  * Add logging of GC activity (CASSANDRA-813)
>> to confirm this:
>>   http://www.slideshare.net/schubertzhang/cassandra-060-insert-throughput
>>
>> - m.
>>
>>  On Sun, Apr 18, 2010 at 6:58 PM, Eric Evans <eevans@rackspace.com> wrote:
>>
>>
>> Hot on the trails of 0.6.0 comes our latest, 0.6.1. This stable point
>> release contains a number of important bugfixes[1] and is a painless
>> upgrade from 0.6.0.
>>
>> Enjoy!
>>
>> [1]: http://bit.ly/9NqwAb (changelog)
>>
>> --
>> Eric Evans
>> eevans@rackspace.com
>>
>>
>>
>

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