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Re: Dual core

From: Stefan Küng <tortoisesvn_at_gmail.com>
Date: 2006-03-07 17:25:36 CET

Oblio wrote:
>
>> There is absolutely *no* way a program in userspace can do that. Only
>> drivers can lock a system that hard.
>
> I'm not so sure - I've had occasions where software has done that. So
> much CPU is consumed that the OS never gets around to redrawing the
> screen. There are brief windows where other programs can execution, or
> at least be added to the queue. Particularly painful on a server.

A normal user program can't do that. A service can do it under some
special circumstances, but never a normal user program. The system will
always provide enough CPU resources to every user program equally. Even
if a program uses 100% CPU (the task manager showing that), other
programs still get their share of CPU time.
If not even the task manager can be shown, something must be seriously
wrong, something a normal user program simply can't do.
Of course, if a user program triggers a bug in a driver (we had some
time ago an issue where also TSVN seemed to be the reason for a serious
system block - but it turned out to be a buggy video driver).

Stefan

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Received on Tue Mar 7 17:26:19 2006

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