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From "Peter Keegan" <peterlkee...@gmail.com>
Subject Re: Throughput doesn't increase when using more concurrent threads
Date Wed, 22 Feb 2006 19:52:21 GMT
I am doing a performance comparison of Lucene on Linux vs Windows.

I have 2 identically configured servers (8-CPUs (real) x 3GHz Xeon
processors, 64GB RAM). One is running CentOS 4 Linux, the other is running
Windows server 2003 Enterprise Edition x64. Both have 64-bit JVMs from Sun.
The Lucene server is using MMapDirectory. I'm running the jvm with
-Xmx16000M. Peak memory usage of the jvm on Linux is about 6GB and 7.8GB on
windows.

I'm observing query rates of 330 queries/sec on the Wintel server, but only
200 qps on the Linux box. At first, I suspected a network bottleneck, but
when I 'short-circuited' Lucene, the query rates were identical.

I suspect that there are some things to be tuned in Linux, but I'm not sure
what. Any advice would be appreciated.

Peter



On 1/30/06, Peter Keegan <peterlkeegan@gmail.com> wrote:
>
> I cranked up the dial on my query tester and was able to get the rate up
> to 325 qps. Unfortunately, the machine died shortly thereafter (memory
> errors :-( ) Hopefully, it was just a coincidence. I haven't measured 64-bit
> indexing speed, yet.
>
> Peter
>
> On 1/29/06, Daniel Noll <daniel@nuix.com.au> wrote:
> >
> > Peter Keegan wrote:
> > > I tried the AMD64-bit JVM from Sun and with MMapDirectory and I'm now
> > > getting 250 queries/sec and excellent cpu utilization (equal
> > concurrency on
> > > all cpus)!! Yonik, thanks for the pointer to the 64-bit jvm. I wasn't
> > aware
> > > of it.
> > >
> > Wow.  That's fast.
> >
> > Out of interest, does indexing time speed up much on 64-bit hardware?
> > I'm particularly interested in this side of things because for our own
> > application, any query response under half a second is good enough, but
> > the indexing side could always be faster. :-)
> >
> > Daniel
> >
> > --
> > Daniel Noll
> >
> > Nuix Australia Pty Ltd
> > Suite 79, 89 Jones St, Ultimo NSW 2007, Australia
> > Phone: (02) 9280 0699
> > Fax:   (02) 9212 6902
> >
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