[petsc-users] Error - Out of memory. This could be due to allocating too large an object or bleeding by not properly ...

[Matthew Knepley]

On Wed, Feb 24, 2016 at 9:16 AM, TAY wee-beng <zonexo at gmail.com> wrote:

>
> On 24/2/2016 9:12 PM, Matthew Knepley wrote:
>
> On Wed, Feb 24, 2016 at 1:54 AM, TAY wee-beng <zonexo at gmail.com> wrote:
>
>>
>> On 24/2/2016 10:28 AM, Matthew Knepley wrote:
>>
>> On Tue, Feb 23, 2016 at 7:50 PM, TAY wee-beng < <zonexo at gmail.com>
>> zonexo at gmail.com> wrote:
>>
>>> Hi,
>>>
>>> I got this error (also attached, full) when running my code. It happens
>>> after a few thousand time steps.
>>>
>>> The strange thing is that for 2 different clusters, it stops at 2
>>> different time steps.
>>>
>>> I wonder if it's related to DM since this happens after I added DM into
>>> my code.
>>>
>>> In this case, how can I find out the error? I'm thinking valgrind may
>>> take very long and gives too many false errors.
>>
>>
>> It is very easy to find leaks. You just run a few steps with -malloc_dump
>> and see what is left over.
>>
>>    Matt
>>
>> Hi Matt,
>>
>> Do you mean running my a.out with the -malloc_dump and stop after a few
>> time steps?
>>
>> What and how should I "see" then?
>>
>
> -malloc_dump outputs all unfreed memory to the screen after
> PetscFinalize(), so you should see the leak.
> I guess it might be possible to keep creating things that you freed all at
> once at the end, but that is less likely.
>
>    Matt
>
>
> Hi,
>
> I got the output. I have zipped it since it's rather big. So it seems to
> be from DM routines but can you help me where the error is from?
>

Its really hard to tell by looking at it. What I do is remove things until
there is no leak, then progressively
put thing back in until I have the culprit. Then you can think about what
is not destroyed.

  Matt


> Thanks.
>
>
>>
>>
>>> --
>>> Thank you
>>>
>>> Yours sincerely,
>>>
>>> TAY wee-beng
>>>
>>>
>>
>>
>> --
>> What most experimenters take for granted before they begin their
>> experiments is infinitely more interesting than any results to which their
>> experiments lead.
>> -- Norbert Wiener
>>
>>
>>
>
>
> --
> What most experimenters take for granted before they begin their
> experiments is infinitely more interesting than any results to which their
> experiments lead.
> -- Norbert Wiener
>
>
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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