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Subject: Re: [OMPI users] Open MPI, Segmentation fault
From: amjad ali (amjad11_at_[hidden])
Date: 2010-06-30 16:13:09


Based on my experiences, I would FULLY endorse (100% agree with) David
Zhang.
It is usually a coding or typo mistake.

At first, Ensure that array sizes and dimension are correct.

I experience that if openmpi is compiled with gnu compilers (not with Intel)
then it also point outs the subroutine exactly in which the fault occur.
have a try.

best,
AA

On Wed, Jun 30, 2010 at 12:43 PM, David Zhang <solarbikedz_at_[hidden]> wrote:

> When I got segmentation faults, it has always been my coding mistakes.
> Perhaps your code is not robust against number of processes not divisible by
> 2?
>
> On Wed, Jun 30, 2010 at 8:47 AM, Jack Bryan <dtustudy68_at_[hidden]>wrote:
>
>> Dear All,
>>
>> I am using Open MPI, I got the error:
>>
>> n337:37664] *** Process received signal ***
>> [n337:37664] Signal: Segmentation fault (11)
>> [n337:37664] Signal code: Address not mapped (1)
>> [n337:37664] Failing at address: 0x7fffcfe90000
>> [n337:37664] [ 0] /lib64/libpthread.so.0 [0x3c50e0e4c0]
>> [n337:37664] [ 1]
>> /lustre/home/rhascheduler/RhaScheduler-0.4.1.1/mytest/nmn2 [0x414ed7]
>> [n337:37664] [ 2] /lib64/libc.so.6(__libc_start_main+0xf4) [0x3c5021d974]
>> [n337:37664] [ 3]
>> /lustre/home/rhascheduler/RhaScheduler-0.4.1.1/mytest/nmn2(__gxx_personality_v0+0x1f1)
>> [0x412139]
>> [n337:37664] *** End of error message ***
>>
>> After searching answers, it seems that some functions fail.
>>
>> My program can run well for 1,2,10 processors, but fail when the number of
>> tasks cannot
>> be divided evenly by number of processes.
>>
>> Any help is appreciated.
>>
>> thanks
>>
>> Jack
>>
>> June 30 2010
>>
>>
>> ------------------------------
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>>
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>>
>
>
>
> --
> David Zhang
> University of California, San Diego
>
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