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XP/VW 7.4: Which CPU-core?

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John Treble

XP/VW 7.4: Which CPU-core?

Is there any way for my VW application to determine which CPU-core it's
running on? I know I can set this manually (at least initially) with XP's
"Processor Affinity" tool but I would like to know if and when this changes.

John Treble
Ottawa, Canada

Reinout Heeck-2

Re: XP/VW 7.4: Which CPU-core?

Hi John,

I know we have a call to set the processor affinity mask, see here.
to read the current affinity mask see here
If you have windows 2003 or Vista you can use the following call
to get the processor number is was running on.

All calls related to threads and processes can be found here.
I hope this helps,

Cham

John Treble wrote:

Is there any way for my VW application to determine which CPU-core it's
running on?  I know I can set this manually (at least initially) with XP's
"Processor Affinity" tool but I would like to know if and when this changes.



John Treble
Ottawa, Canada

Runar Jordahl

Re: XP/VW 7.4: Which CPU-core?

In reply to this post by John Treble

What I found was that many running VisualWorks images are properly
scheduled by Windows XP. For example, if you have three images and any
two are running, both cores seems to always be used:
http://www.cincomsmalltalk.com/userblogs/runarj/blogView?showComments=true&entry=3334319381

So I guess you can ignore the whole issue of determining which core an
image runs on.

John Treble

RE: XP/VW 7.4: Which CPU-core?

In reply to this post by Reinout Heeck-2

Snip...
> I know we have a call to set the processor affinity mask, see here.
Snip...

Cham,

Thanks for the info: Set/GetProcessAffinityMask looks like it will work.

John Treble

John Treble

RE: XP/VW 7.4: Which CPU-core?

In reply to this post by Runar Jordahl

> What I found was that many running VisualWorks images are properly
> scheduled by Windows XP. For example, if you have three images and any
> two are running, both cores seems to always be used:
> http://www.cincomsmalltalk.com/userblogs/runarj/blogView?showComments=
> true
> &entry=3334319381
>
> So I guess you can ignore the whole issue of determining which core an
> image runs on.

Runar,

Interesting info. At this point I'm just taking an existing application and
trying to make it cluster/DST aware. I'm not sure I will be using the
CPU-core information in the end.

John Treble

Reinout Heeck-2

Re: XP/VW 7.4: Which CPU-core?

John Treble wrote:

>
>> What I found was that many running VisualWorks images are properly
>> scheduled by Windows XP. For example, if you have three images and any
>> two are running, both cores seems to always be used:
>> http://www.cincomsmalltalk.com/userblogs/runarj/blogView?showComments=
>> true
>> &entry=3334319381
>>
>> So I guess you can ignore the whole issue of determining which core an
>> image runs on.
>
>
> Runar,
>
> Interesting info. At this point I'm just taking an existing application and
> trying to make it cluster/DST aware. I'm not sure I will be using the
> CPU-core information in the end.
>

We found it helpful to 'attach' different images in our system to a CPU
for debugging purposes, the graphics in the task manager then nicely
shows you which images are active at a given time.

In deployment it is probably best to let the system assign CPUs to tasks.

R
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