On Wed, Apr 26, 2006 at 10:17:58AM -0500, Scott Marlowe wrote: > On Tue, 2006-04-25 at 18:55, Jim C. Nasby wrote: > > On Tue, Apr 25, 2006 at 01:33:38PM -0500, Scott Marlowe wrote: > > > On Tue, 2006-04-25 at 13:14, Bill Moran wrote: > > > > I've been given the task of making some hardware recommendations for > > > > the next round of server purchases. The machines to be purchased > > > > will be running FreeBSD & PostgreSQL. > > > > > > > > Where I'm stuck is in deciding whether we want to go with dual-core > > > > pentiums with 2M cache, or with HT pentiums with 8M cache. > > > > > > Given a choice between those two processors, I'd choose the AMD 64 x 2 > > > CPU. It's a significantly better processor than either of the Intel > > > choices. And if you get the HT processor, you might as well turn of HT > > > on a PostgreSQL machine. I've yet to see it make postgresql run faster, > > > but I've certainly seen HT make it run slower. > > > > Actually, believe it or not, a coworker just saw HT double the > > performance of pgbench on his desktop machine. Granted, not really a > > representative test case, but it still blew my mind. This was with a > > database that fit in his 1G of memory, and running windows XP. Both > > cases were newly minted pgbench databases with a scale of 40. Testing > > was 40 connections and 100 transactions. With HT he saw 47.6 TPS, > > without it was 21.1. > > > > I actually had IT build put w2k3 server on a HT box specifically so I > > could do more testing. > > Just to clarify, this is PostgreSQL on Windows, right? > > I wonder if the latest Linux kernel can do that well... I'm guessing > that the kernel scheduler in Windows has had a lot of work to make it > good at scheduling on a HT architecture than the linux kernel has. Yes, this is on Windows XP. Larry might also have a HT box with some other OS on it we can check with (though I suspect that maybe that's been beaten to death...) -- Jim C. Nasby, Sr. Engineering Consultant jnasby@xxxxxxxxxxxxx Pervasive Software http://pervasive.com work: 512-231-6117 vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
