PS: i'm using openmpi 1.2.5.. 2008/12/15 Gabriele Fatigati <g.fatig...@cineca.it>: > 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 >
-- 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
