Just for an additional viewpoint. I'm finishing up a project based on FreeBSD and PostgreSQL. The target server is a Dual 2.4G Intel machine. I have tested the application with hyperthreading enabled and disabled. To all appearances, enabling hyperthreading makes the box act like a quad, with the expected increase in processing capability - _for_this_application_.
I have also heard the claims and seen the tests that show hyperthreading occasionally decreasing performance. I think in the end, you just have to test your particular application to see how it reacts.
Rob Sell wrote:
Not being one to hijack threads, but I haven't heard of this performance hit
when using HT, I have what should all rights be a pretty fast server, dual
2.4 Xeons with HT 205gb raid 5 array, 1 gig of memory. And it is only 50% as
fast as my old server which was a dual AMD MP 1400's with a 45gb raid 5
array and 1gb of ram. I have read everything I could find on Pg performance
tweaked all the variables that were suggested and nothing. Which is why I
subscribed to this list, just been lurking so far but this caught my eye.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Andrew Sullivan Sent: Friday, October 31, 2003 8:36 AM To: [EMAIL PROTECTED] Subject: Re: [PERFORM] Pg+Linux swap use
On Fri, Oct 31, 2003 at 12:03:59PM -0200, alexandre :: aldeia digital wrote:
Scott, Jeff and Shridhar:
1 GB RAM :)
The stock kernels are not the same, HyperThreading enabled. 80
Some people have reported that things actually slow down with HT enabled. Have you tried turning it off?
-- Bill Moran Potential Technologies http://www.potentialtech.com
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