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From "Jaeger, Jay - DOT" <Jay.Jae...@dot.wi.gov>
Subject RE: strange performance issue with many shards on one server
Date Wed, 28 Sep 2011 21:01:05 GMT
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
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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