Re: Poor thread performance on multi-CPU machines

Article View: borland.public.cppbuilder.nativeapi

Article #11892

Back to borland.public.cppbuilder.nativeapi Previous Next

#11892

From: Alan Bellingham
Date: Sat, 10 Jan 2004 01:20

23 lines
1968 bytes

"Vladas" <vladas1@hotmail.com> wrote:

>As far as I know one process can use only one CPU at a time. Even if you
>have several threads that is still one process. Let's say you have 2 CPU
>system. That means your application can have 50% CPU utilization max.

As Gambit points out, your knowledge is insufficient.

A _thread_ can only execute on one CPU (or pseudo-CPU in the case of
Hyperthreading), but the multiple threads of a process are certainly
allowed to invade as many different processors as they like.

Big database applications usually insist on multi-CPU systems exactly so
that their multiple threads can use more power.

(This all assumes you're CPU bound anyway. There are plenty of apps
which are I/O bound.)

Alan Bellingham
-- 
Me <url:mailto:alanb@episys.com> <url:http://www.doughnut.demon.co.uk/>
ACCU - C, C++ and Java programming               <url:http://accu.org/>
The 2004 Discworld Convention                   <url:http://dwcon.org/>

Technical Details

Message-ID: <pgkuvv0l8c4cdh8anfkjlpq7h86nr6fofd@4ax.com>

Path:

arc1-ca.pugleaf.net!archiver1.google.com!news2.google.com!news.maxwell.syr.edu!newsfeed00.sul.t-online.de!newsfeed01.sul.t-online.de!t-online.de!newsgroups.borland.com!not-for-mail

References: <3fff05ce$1@newsgroups.borland.com> <3fff2f6f$1@newsgroups.borland.com>

Show Full Headers

Complete Article Headers

X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 10cc67,6aabc16a59635b8c
X-Google-Attributes: gid10cc67,public
X-Google-ArrivalTime: 2004-01-09 17:39:36 PST
From: Alan Bellingham <alanb@episys.com>
Newsgroups: borland.public.cppbuilder.nativeapi
Subject: Re: Poor thread performance on multi-CPU machines
Date: Sat, 10 Jan 2004 01:20:08 +0000
Reply-To: alanb@episys.com
Message-ID: <pgkuvv0l8c4cdh8anfkjlpq7h86nr6fofd@4ax.com>
References: <3fff05ce$1@newsgroups.borland.com> <3fff2f6f$1@newsgroups.borland.com>
X-Newsreader: Forte Agent 1.93/32.576 English (American)
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
NNTP-Posting-Host: 62.49.31.105
X-Trace: newsgroups.borland.com 1073697606 62.49.31.105 (9 Jan 2004 17:20:06 -0700)
Lines: 23
Path: arc1-ca.pugleaf.net!archiver1.google.com!news2.google.com!news.maxwell.syr.edu!newsfeed00.sul.t-online.de!newsfeed01.sul.t-online.de!t-online.de!newsgroups.borland.com!not-for-mail

Reply to Parent Message