Re: RAC 'gc blocks lost' in stress test
- From: Martin Klier <usn@xxxxxxxxx>
- To: yong321@xxxxxxxxx
- Date: Thu, 20 Mar 2008 15:12:52 +0100
Hi,
Yong Huang schrieb:
> We're using Swingbench to stress test an 8-node 10.2.0.3 RAC running on RH
> Linux (2.6.9-55.ELsmp x86_64). The total non-idle active sessions is between
> 200 and 300 (select count(*) from gv$session where status = 'ACTIVE' and
> wait_class != 'Idle'). At this stress level, we start to see 'gc blocks lost'
> statistic going up, sometimes as fast as 10 in 2 hours.
> gv$cr_block_server.fail_results also goes up.
in load times, my 4-node-RAC (10gR2 64bit on Linux) has between 58 and
140 lost gc blocks. I never had any troble with that. But you can
decrease that number by setting the parallel_execution_message_size to a
value as large as your architecture supports it. Target: 65535.
Regards
Martin Klier
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