On Wed, 2009-06-24 at 21:38 +0200, Nigel wrote: > It sounds like surely any swapping out of the JVM memory could cause big and > unpredictable performance drops. As I just mentioned in reply to Uwe, our > poor performance times don't always directly correlate with index updates, > but it may be that the damage is done and the effects are only seen sometime > later.
We were hit by GC hell some time ago when we ran JVMs with 5-7GB allocated. It turned out that using Sun's RMI forces a total garbage collection once a minute. At least for the version we used at the time. Some info at http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6200091 > p.s. I haven't tried SSDs yet, or for that matter faster disks of any sort. We've tested MTRON-SSDs from 2007 vs. 10.000 and 15.000 RPM harddisks in RAID 0 and 1 on a dual-core Intel Xeon machine. There was no doubt that the SSDs were substantially faster than the harddisks for searching. Some related observations was that the need for warm-up and disk-cache was greatly reduced. Regards, Toke Eskildsen --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
