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-----
[mailto:[EMAIL PROTECTED] On Behalf Of Andrew Sullivan
Sent: Friday, October 31, 2003 8:36 AM
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

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