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From "Peter Keegan" <peterlkee...@gmail.com>
Subject Re: Throughput doesn't increase when using more concurrent threads
Date Thu, 23 Feb 2006 21:14:24 GMT
Chris,

I tried JRockit a while back on 8-cpu/windows and it was slower than Sun's.
Since I seem to be cpu-bound right now, I'll be trying a 16-cpu system next
(32 with hyperthreading), on LinTel. I may give JRockit another go around
then.

Thanks,
Peter

On 2/23/06, Chris Lamprecht <clamprecht@gmail.com> wrote:
>
> Peter,
> Have you given JRockit JVM a try?  I've seen it help throughput
> compared to Sun's JVM on a dual xeon/linux machine, especially with
> concurrency (up to 6 concurrent searches happening).  I'm curious to
> see if it makes a difference for you.
>
> -chris
>
> On 2/23/06, Peter Keegan <peterlkeegan@gmail.com> wrote:
> > We discovered that the kernel was only using 8 CPUs. After recompiling
> for
> > 16 (8+hyperthreads), it looks like the query rate will settle in around
> > 280-300 qps. Much better, although still quite a bit slower than the
> > opteron.
> >
> > Peter
> >
> >
> >
> >
> > On 2/22/06, Yonik Seeley <yseeley@gmail.com> wrote:
> > >
> > > Hmmm, not sure what that could be.
> > > You could try using the default FSDir instead of MMapDir to see if the
> > > differences are there.
> > >
> > > Some things that could be different:
> > > - thread scheduling (shouldn't make too much of a difference though)
> > > - synchronization workings
> > > - page replacement policy... how to figure out what pages to swap in
> > > and which to swap out, esp of the memory mapped files.
> > >
> > > You could also try a profiler on both platforms to try and see where
> > > the difference is.
> > >
> > > -Yonik
> > >
> > > On 2/22/06, Peter Keegan <peterlkeegan@gmail.com> wrote:
> > > > 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
> 7.8GBon
> > > > 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
> > > > > >
> > > > > > This message is intended only for the named recipient. If you
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> > > > > > distributing or taking any action in reliance on the contents
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