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From Otis Gospodnetic <otis_gospodne...@yahoo.com>
Subject Re: how to improve concurrent request performance and stress testing
Date Wed, 06 Feb 2008 21:10:42 GMT
Sorry for the awful word wrapping in original email.

The main thing is to warm those caches up (sure, by autowarming for example) before exposing
the searcher.  In other words, don't hit the completely cold searcher with a bunch of requests
at once.

Otis
--
Sematext -- http://sematext.com/ -- Lucene - Solr - Nutch

----- Original Message ----
> From: Ziqi Zhang <ziqi.zhang@hotmail.com>
> To: solr-user@lucene.apache.org
> Sent: Wednesday, February 6, 2008 7:56:46 PM
> Subject: Re: how to improve concurrent request performance and stress testing
> 
> Thanks!
> 
> >
> 
Also
> 
make
> 
sure
> 
that
> 
common
> 
filters,
> 
sort
> 
fields,
> 
and
> 
facets
> 
have
> 
been 
> >
> 
warmed.
> 
> I
> 
assume
> 
these
> 
are
> 
achieved
> 
by
> 
setting
> 
large
> 
cache
> 
size
> 
and
> 
large 
> autowarmcount
> 
number
> 
in
> 
solr
> 
configuration?
> 
specifically
> 
> filterCache
> queryResultCache
> documentCache
> 
> Thanks!
> 
> 
> --------------------------------------------------
> From:
> 
"Yonik
> 
Seeley"
> 

> Sent:
> 
Wednesday,
> 
February
> 
06,
> 
2008
> 
7:50
> 
AM
> To:
> 

> Subject:
> 
Re:
> 
how
> 
to
> 
improve
> 
concurrent
> 
request
> 
performance
> 
and
> 
stress 
> testing
> 
> >
> 
On
> 
Feb
> 
6,
> 
2008
> 
6:37
> 
PM,
> 
Ziqi
> 
Zhang
> 

> 
wrote:
> >>
> 
I
> 
still
> 
do
> 
not
> 
understand
> 
why
> 
sending
> 
100
> 
request
> 
(of
> 
same
> 
query)
> 
from 
> >>
> 
100
> >>
> 
threads
> 
throws
> 
solr
> 
server
> 
to
> 
silence
> 
-
> 
is
> 
it
> 
because
> 
of
> 
the 
> >>
> 
computational
> >>
> 
cost
> 
to
> 
deal
> 
with
> 
same
> 
query
> 
in
> 
100
> 
separate
> 
threads?
> >
> >
> 
Yes...
> 
sending
> 
a
> 
large
> 
number
> 
of
> 
requests
> 
at
> 
once
> 
can
> 
cause
> 
one
> 
to
> >
> 
start
> 
hitting
> 
synchronization
> 
bottlenecks.
> 
> >
> >
> 
-Yonik
> > 
> 



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