Open MPI logo

Open MPI User's Mailing List Archives

  |   Home   |   Support   |   FAQ   |   all Open MPI User's mailing list

Subject: Re: [OMPI users] Valgrind writev() errors with 1.3.2.
From: Ashley Pittman (ashley_at_[hidden])
Date: 2009-06-09 05:31:16


On Mon, 2009-06-08 at 23:41 -0600, tom fogal wrote:
> George Bosilca <bosilca_at_[hidden]> writes:
> > There is a whole page on valgrind web page about this topic. Please
> > read http://valgrind.org/docs/manual/manual-core.html#manual-core.suppress
> > for more information.
>
> Even better, Ralph (et al.) is if we could just make valgrind think
> this is defined memory. One can do this with client requests:
>
> http://valgrind.org/docs/manual/mc-manual.html#mc-manual.clientreqs

Using the Valgrind client requests unnecessarily is a very bad idea,
they are intended for where applications use their own memory allocator
(i.e. replace malloc/free) or are using custom kernel modules or
hardware which Valgrind doesn't know about.

The correct solution is either to not send un-initialised memory or to
suppress the error using a suppression file as George said. As the
error is from MPI_Init() you can safely ignore it from a end-user
perspective.

Ashley.

-- 
Ashley Pittman
Padb - A parallel job viewer for cluster computing
http://padb.pittman.org.uk