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 <[EMAIL PROTECTED]> 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 7.8GB 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 <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]> 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 are not > > > the intended recipient you are notified that disclosing, copying, > > > distributing or taking any action in reliance on the contents of this > > > message or attachment is strictly prohibited. > > > > > > > > > --------------------------------------------------------------------- > > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > > > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
