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
