Whoops; that was a reply to the wrong message. :-)
You'll need to recompile both libiverbs and libmthca with the valgrind
flag, and use the enhanced memchecker support in v1.3.
I have not personally verified that all the warnings disappear in this
configuration (I was hoping to verify this somewhere during the v1.3
series).
On Dec 15, 2008, at 6:37 AM, Gabriele Fatigati wrote:
Hi Jeff,
i recompiled libmthca with --with-valgrind flag, and modified
enviroment variables, but warnings doesnt' disappears..
2008/12/14 Jeff Squyres <jsquy...@cisco.com>:
On Dec 14, 2008, at 8:21 AM, Gabriele Fatigati wrote:
i have a strage problems with OpenMPI 1.2.5 Intel Compiled when i
debug my code under Valgrind 3.3. In a very simple ping-pong MPI
application, i retrieve strange warnings about MPI Communications,
like MPI_Send,MPI_Recv. Valgrind tells me that there are
uninitialized
values in send/recv buffers, but there are initialized, i'm
absolutely
sure!
There warnings are detected when my application runs over
Infiniband
net,
This is because IB uses memory that does not come from the memory
allocator
that Valgrind is aware of (e.g., it may be memory that was
allocated by the
kernel itself). Hence, since Valgrind is unaware of the memory,
it thinks
that its contents are undefined. As such, it's quite likely that
you're
seeing false positives.
The memchecker support in the upcoming v1.3 series made quite a few
advancements in the area of valgrind memory checking, and recent
versions of
libibverbs allow you to compile in valgrind extensions that tell
valgrind
"this memory is ok" (which prevents these false positives). I'm
pretty sure
that the OFED install does not enable these libibverbs valgrind
extensions;
you will likely need your own installation of libibverbs and your
verbs
plugin (libmthca for you, I think...?) that explicitly has the
valgrind
extensions enabled.
--
Jeff Squyres
Cisco Systems
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Ing. Gabriele Fatigati
Parallel programmer
CINECA Systems & Tecnologies Department
Supercomputing Group
Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy
www.cineca.it Tel: +39 051 6171722
g.fatig...@cineca.it
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Jeff Squyres
Cisco Systems
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Jeff Squyres
Cisco Systems
