[Pw_forum] segmentation fault

[Axel Kohlmeyer]

On Fri, Aug 14, 2015 at 1:20 PM, Vishal Gupta <vishal.gupta at iitrpr.ac.in> wrote:
> Sorry, I should've mentioned.
> I asked them but they said there might be something wrong with the QE input
> file. If that was the case, the file shouldn't have been running fine with 7
> processors but it is. Could there really be something wrong with the input
> file ?

sysadmins often say this, so they don't have to check it out, or when
they don't know what they are doing. if they *know* that there is
something wrong with the input, then they should at the very least
tell you what it is.

but i agree that if it works with less processors, it should work with
more. unless you are using some very unusual settings when launching
the job. more likely is that you are running out of memory on the
machine or are hitting a stack size limit or something similar. your
system manager(s) should be able to figure this out and/or advise you
how to run that you are using less memory, or with a hybrid MPI plus
OpenMP parallelization or whatever else is possible on the specific
machine.

in any case, it doesn't really sound like a QE problem.

axel.


> Sorry if I am asking stupid doubts but I am little new at this.
> Vishal Gupta
> B.Tech. 3rd year Mechanical
> Indian Institute of Technology Ropar
> Rupnagar (140001), Punjab, India.
> Email :- vishal.gupta at iitrpr.ac.in
>
> On Fri, Aug 14, 2015 at 10:32 PM, Axel Kohlmeyer <akohlmey at gmail.com> wrote:
>>
>> On Fri, Aug 14, 2015 at 12:58 PM, Vishal Gupta
>> <vishal.gupta at iitrpr.ac.in> wrote:
>> > I've been running an SCF calculation for a fee Ni system on High
>> > performance
>> > cluster. The job runs fine with processors 7 or less but it always leads
>> > to
>> > segmentation fault if the no of processors exceeds 7.
>> > The job takes 4-5 days for the run.
>> > Is there any way to increase the no of processors so that it doesn't
>> > lead to
>> > the error ?
>> > mpirun noticed that process rank 0 with PID 6353 on node c7c exited on
>> > signal 11 (Segmentation fault).
>> > or excessive memory leakage.
>>
>> that is really a question your should ask the system manager(s) or
>> user support people of the machine that you are running on.
>>
>> axel.
>>
>>
>> >
>> > Thank You
>> > Vishal Gupta
>> > B.Tech. 3rd year Mechanical
>> > Indian Institute of Technology Ropar
>> > Rupnagar (140001), Punjab, India.
>> > Email :- vishal.gupta at iitrpr.ac.in
>> >
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>>
>>
>>
>> --
>> Dr. Axel Kohlmeyer  akohlmey at gmail.com  http://goo.gl/1wk0
>> College of Science & Technology, Temple University, Philadelphia PA, USA
>> International Centre for Theoretical Physics, Trieste. Italy.
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>
>
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-- 
Dr. Axel Kohlmeyer  akohlmey at gmail.com  http://goo.gl/1wk0
College of Science & Technology, Temple University, Philadelphia PA, USA
International Centre for Theoretical Physics, Trieste. Italy.