| Re: IDL and Linux on dual processor [message #19302] |
Fri, 10 March 2000 00:00 |
pit
Messages: 92
Registered: January 1996
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Member |
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Hi Charles,
> I'm using dual PIII 450's in a SuperMicro P6DBS
> motherboard, with 256 megs of RAM, and 512 megs of swap space.
almost the same here, I just happen to have an ASUS PB2DS.
> The IDL code is very short:
[ snip ]
Just tried it here (started 2 of them, while 2 other IDL-Jobs + one
mprime were running) - no problems whatsoever.
> It doesn't seem to be a memory problem, unless there is
> a memory leak somewhere.
unlikely. You would be able to see that in e.g. top
> I can run compiled jobs, or single IDL jobs using
> large memory requirements that require swapping, with
> no problem.
Hm, maybe a problem with the libraries IDL is linked against!?
Sorry, can't give any more help there...
> Any ideas?
Not really, if it's only IDL that is crashing the computer. That
rules out almost any hardware related problems.
Try to find out the exact library version IDL was compiled with, and
see which version you have.
Good Luck,
Peter
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~
Dr. Peter "Pit" Suetterlin http://www.astro.uu.nl/~suetter
Sterrenkundig Instituut Utrecht
Tel.: +31 (0)30 253 5225 P.Suetterlin@astro.uu.nl
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| Re: IDL and Linux on dual processor [message #19319 is a reply to message #19302] |
Thu, 09 March 2000 00:00  |
charles fowler
Messages: 2
Registered: March 2000
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Junior Member |
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Peter,
I'm using dual PIII 450's in a SuperMicro P6DBS
motherboard, with 256 megs of RAM, and 512 megs of swap space.
The IDL code is very short:
pro idl_test
for i=0l,1000000 do begin
for j=0l,1000000 do begin
;help,/mem
;help,/heap_variables
a=[1]
end
end
end
If I start this twice so that both processors
are running, the machine freezes in less
than a minute or two.
It doesn't seem to be a memory problem, unless there is
a memory leak somewhere.
I've also tried niceing IDL to 5 instead of the default
0 , but that didn't seem to help, except that maybe it might
take a little longer to freeze up, but that could be my
imagination.
I can run compiled jobs, or single IDL jobs using
large memory requirements that require swapping, with
no problem.
Sticking print statements in the above code show that
the problem never happens at the same place.
RSI had me include the 2 help commands, they showed
nothing interesting.
Any ideas?
Thanks,
chuck.
************************************************************
* Charles Fowler cfowler@boulder.colorado.edu *
* Voice (303) 492-0975 FAX (303) 492-2825 *
* Colorado Center for Astrodynamics Research *
* University of Colorado at Boulder *
* Campus Box 431 Boulder, Colorado 80309-0431 *
************************************************************
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| Re: IDL and Linux on dual processor [message #19322 is a reply to message #19319] |
Thu, 09 March 2000 00:00 |
pit
Messages: 92
Registered: January 1996
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Member |
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In article <38C53DC8.4C39C579@colorado.edu>,
charles fowler <cfowler@colorado.edu> writes:
> Hi all,
>
> I'm running IDL on a dual processor
> Linux machine.
What Processors, which Mainboard, how much memory,
and how much memory do the IDL-Jobs require?
> When I run two intensive IDL jobs so
> that both processors are being used,
> the machine freezes,and I have to reboot.
> The machine will freeze with a matter of
> seconds. TOP shows 100% usage at freeze point.
>
> I can run multiple compiled C or FORTRAN
> programs all day just fine.
Do they also use about the same amount of memory as the
IDL-Jobs?
> RSI says that they cannot duplicate the problem.
Me neither, but I'm running SuSE. The System load is
2-4 for 24/7, doing 2-3 IDL Jobs in parallel, no problems
whatsoever.
> Does anyone have any suggestions?
> Is this a problem with IDL, REDHAT, motherboard???
Either MB (e.g. I have lots of Problems with a Gigabyte
Mainboard that freezes with interrupt problems).
Or Memory Problems. Try looking for memtest (look e.g.
at freshmeat) and check it.
Have a look at the Kernel messages (Don't know RedHat,
SuSE has Kernel logging on console 10; switch there
immediately after starting the jobs, or start them with
a delay, and look.)
Peter
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~
Dr. Peter "Pit" Suetterlin http://www.astro.uu.nl/~suetter
Sterrenkundig Instituut Utrecht
Tel.: +31 (0)30 253 5225 P.Suetterlin@astro.uu.nl
____________________________________________________________ ______________
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| Re: IDL and Linux on dual processor [message #19361 is a reply to message #19319] |
Tue, 07 March 2000 00:00 |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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charles fowler <cfowler@colorado.edu> writes:
> Hi all,
>
> I'm running IDL on a dual processor
> Linux machine.
>
> When I run two intensive IDL jobs so
> that both processors are being used,
> the machine freezes,and I have to reboot.
> The machine will freeze with a matter of
> seconds. TOP shows 100% usage at freeze point.
...
>
> The problem also occurred with RH 6.0
> and IDL 5.2.
I have seen two intensive IDL jobs running on IDL 5.2 with Redhat 5.2
with dual processors, with no crashes. Sorry.
Craig
--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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