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From Frederik Kraus <frederik.kr...@gmail.com>
Subject Re: strange performance issue with many shards on one server
Date Wed, 28 Sep 2011 21:16:43 GMT
 Yep, I'm not getting more than 50-60% CPU during those load tests. 


Am Mittwoch, 28. September 2011 um 23:01 schrieb Jaeger, Jay - DOT:

> Yes, that thread waits (in the sense that nothing useful gets done), but during that
time, from the perspective of the applications and OS, that CPU is busy: it is not "waiting"
in such a way that you can dispatch a different process.
> 
> The point is, that if this was actually the problem, it would show up in a higher CPU
utilization than the correspondent reported.
> 
> -----Original Message-----
> From: Federico Fissore [mailto:federico@fissore.org] 
> Sent: Wednesday, September 28, 2011 2:04 PM
> To: solr-user@lucene.apache.org (mailto:solr-user@lucene.apache.org)
> Subject: Re: strange performance issue with many shards on one server
> 
> Jaeger, Jay - DOT, il 28/09/2011 18:40, ha scritto:
> > That would still show up as the CPU being busy.
> 
> i don't know how the program (top, htop, whatever) displays the value 
> but when the cpu has a cache miss definitely that thread sits and waits 
> for a number of clock cycles
> with 130GB of ram (per server?) I suspect caches miss as a rule
> 
> just a suspicion however, nothing I'll bet on



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