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Subject: Re: [OMPI users] my leak or OpenMPI's leak?
From: Ralph Castain (rhc_at_[hidden])
Date: 2010-10-17 19:57:28


There is no OMPI 2.5 - do you mean 1.5?

On Oct 17, 2010, at 4:11 PM, Brian Budge wrote:

> Hi Jody -
>
> I noticed this exact same thing the other day when I used OpenMPI v
> 2.5 built with valgrind support. I actually ran out of memory due to
> this. When I went back to v 2.43, my program worked fine.
>
> Are you also using 2.5?
>
> Brian
>
> On Wed, Oct 6, 2010 at 4:32 AM, jody <jody.xha_at_[hidden]> wrote:
>> Hi
>> I regularly use valgrind to check for leaks, but i ignore the leaks
>> clearly created by OpenMPI,
>> because i think most of them happen because of efficiency (lose no
>> time cleaning up unimportant leaks).
>> But i want to make sure no leaks come from my own apps.
>> In most of the cases, leaks i am responsible for have the name of one
>> of my files at the bottom of the stack printed by valgrind,
>> and no internal OpenMPI-calls above, whereas leaks clearly caused by
>> OpenMPI have something like
>> ompi_mpi_init, mca_pml_base_open, PMPI_Init etc at or very near the bottom.
>>
>> Now i have an application where i am completely unsure where the
>> responsibility for a particular leak lies. valgrind shows (among
>> others) this report
>>
>> ==2756== 9,704 (8,348 direct, 1,356 indirect) bytes in 1 blocks are
>> definitely lost in loss record 2,033 of 2,036
>> ==2756== at 0x4005943: malloc (vg_replace_malloc.c:195)
>> ==2756== by 0x4049387: ompi_free_list_grow (in
>> /opt/openmpi-1.4.2.p/lib/libmpi.so.0.0.2)
>> ==2756== by 0x41CA613: ???
>> ==2756== by 0x41BDD91: ???
>> ==2756== by 0x41B0C3D: ???
>> ==2756== by 0x408AC9C: PMPI_Send (in
>> /opt/openmpi-1.4.2.p/lib/libmpi.so.0.0.2)
>> ==2756== by 0x8123377: ConnectorBase::send(CollectionBase*,
>> std::pair<std::pair<unsigned short, unsigned short>,
>> std::pair<unsigned short, unsigned short> >&) (ConnectorBase.cpp:39)
>> ==2756== by 0x8123CEE: TileConnector::sendTile() (TileConnector.cpp:36)
>> ==2756== by 0x80C6839: TDMaster::init(int, char**) (TDMaster.cpp:226)
>> ==2756== by 0x80C167B: main (TDMain.cpp:24)
>> ==2756==
>>
>> At a first glimpse it looks like an OpenMPI-internal leak,
>> because it happens iinside PMPI_Send,
>> but then i am using the function ConnectorBase::send()
>> several times from other callers than TileConnector,
>> but these don't show up in valgrind's output.
>>
>> Does anybody have an idea what is happening here?
>>
>> Thank You
>> jody
>> _______________________________________________
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>>
>
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