Hi Jeff, i recompiled libibverbs and libmthca with valgrind flas, but for strage reasons, only warning over MPI_Send are disappears, but warnings over MPI_Recv remains!
2008/12/15 Jeff Squyres <jsquy...@cisco.com>: > 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 >>>> >>>> _______________________________________________ >>>> users mailing list >>>> us...@open-mpi.org >>>> http://www.open-mpi.org/mailman/listinfo.cgi/users >>>> >>>> >>> >>> >>> >>> -- >>> 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 >>> _______________________________________________ >>> users mailing list >>> us...@open-mpi.org >>> http://www.open-mpi.org/mailman/listinfo.cgi/users >> >> >> -- >> Jeff Squyres >> Cisco Systems >> >> _______________________________________________ >> users mailing list >> us...@open-mpi.org >> http://www.open-mpi.org/mailman/listinfo.cgi/users > > > -- > Jeff Squyres > Cisco Systems > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users > > -- 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
