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Subject: [OMPI users] my leak or OpenMPI's leak?
From: jody (jody.xha_at_[hidden])
Date: 2010-10-06 07:32:47


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