[DUG] XP, hyperthreading and speed

[Kyley Harris]

http://news.zdnet.co.uk/hardware/0,1000000091,39237341,00.htm

That article is from 2005..

not sure now.. it was a while back that I did my own testing which related
to doing something along the lines of the following..

and Indy TCP Server, multi threaded with 5 connections, each connection
Doing the same task repetitively.. with 5 connecting exes all hammering the
query away as fast as possible.. The test was to measure how many requests
per second the server could handle.. it was doing about 20 a second (which
was slow) and after forcing the server application to make use of only 1 CPU
(can be done in code) it jumped to 120 processes a second.. the issue I
gather is internal locking on the threads..  WIKIpedia quotes the issue as a
P4 architecture issue.

On 11/5/07, Leigh Wanstead <leighw at softtech.co.nz> wrote:
>
>  Any article related to what you said?
>
> TIA
>
> Regards
> Leigh
>
> -----Original Message-----
> *From:* delphi-bounces at delphi.org.nz [mailto:delphi-bounces at delphi.org.nz]
> *On Behalf Of *Kyley Harris
> *Sent:* Monday, November 05, 2007 4:24 PM
> *To:* NZ Borland Developers Group - Delphi List
> *Subject:* Re: [DUG] XP, hyperthreading and speed
>
> Its been proven long ago that Hyperthreading slows down a delphi multi
> threaded app.. Any Server app I have on a hyperthreaded machine can go 10
> times faster if I force it to use only 1 cpu from the task manager.
> something to do with Context switching in the app.. I don't know how this
> would be under the new dual cores.. that was P4 architecture.
>
>
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-- 
Kyley Harris
Harris Software
+64-21-671-821
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