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From: Jon Harrop on 31 Jul 2010 02:41
I have an 8-core desktop composed of two quadcore Xeons. Whenever I try to
run parallel Mathematica 7.0.1 code it tries to spawn 8 kernels and then
four of them die, resulting in lots of communication errors. Is this normal?

--
Dr Jon Harrop, Flying Frog Consultancy Ltd.
http://www.ffconsultancy.com


From: Zach Bjornson on 1 Aug 2010 04:57
Do you have a proper license for 8 kernels? The normal home(?) license is only
for four kernels; this may be Mathematica's way of saying you can only use
four. Just a guess.

Quoting Jon Harrop <usenet(a)ffconsultancy.com>:

> I have an 8-core desktop composed of two quadcore Xeons. Whenever I try to
> run parallel Mathematica 7.0.1 code it tries to spawn 8 kernels and then
> four of them die, resulting in lots of communication errors. Is this normal?
>
> --
> Dr Jon Harrop, Flying Frog Consultancy Ltd.
> http://www.ffconsultancy.com
>
>
>



From: Jon Harrop on 2 Aug 2010 07:06
I only have a license for 4 kernels but I'd expect Mathematica to tell me that
rather than spew out pages of errors every time I try to use parallelism. I
just wanted to check that everyone else was seeing the same behaviour.

Cheers,
Jon.

"Zach Bjornson" <bjornson(a)mit.edu> wrote in message
news:i33ctt$85p$1(a)smc.vnet.net...
> Do you have a proper license for 8 kernels? The normal home(?) license is
> only
> for four kernels; this may be Mathematica's way of saying you can only use
> four. Just a guess.
>
> Quoting Jon Harrop <usenet(a)ffconsultancy.com>:
>
>> I have an 8-core desktop composed of two quadcore Xeons. Whenever I try
>> to
>> run parallel Mathematica 7.0.1 code it tries to spawn 8 kernels and then
>> four of them die, resulting in lots of communication errors. Is this
>> normal?
>>
>> --
>> Dr Jon Harrop, Flying Frog Consultancy Ltd.
>> http://www.ffconsultancy.com
>>
>>
>>
>
>
>


From: Peter Pein on 3 Aug 2010 06:38
Am Mon, 2 Aug 2010 11:06:33 +0000 (UTC)
schrieb "Jon Harrop" <usenet(a)ffconsultancy.com>:

> I only have a license for 4 kernels but I'd expect Mathematica to
> tell me that rather than spew out pages of errors every time I try to
> use parallelism. ...

And going via menu "Evaluation" -> "Parallel Kernel Configuration" to
the kernel-conf.-dialog, choosing "Manual" and "4" didn't help?

Then I'd call it a bug.

Peter


From: bbeckage on 3 Aug 2010 06:39
I had a similar problem on an 8 kernel machine (with 8 licenses for Mathematica). I worked with Wolfram support with respect to this problem, but the problem does not appear to have been solved yet...

Best wishes,
Brian


On Jul 31, 2010, at 2:41 AM, Jon Harrop wrote:

> I have an 8-core desktop composed of two quadcore Xeons. Whenever I try to
> run parallel Mathematica 7.0.1 code it tries to spawn 8 kernels and then
> four of them die, resulting in lots of communication errors. Is this normal?
>
> --
> Dr Jon Harrop, Flying Frog Consultancy Ltd.
> http://www.ffconsultancy.com
>

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