Hi Jeff, Thanks for the pointers. I tried with both CFLAGS=-g3 and --enable-debug (separately), however, I am still unable to jump into the MPI source. It seems I am missing a small step(s) somewhere.
I compiled my MPI application with the new library built with above flags, ran it and attached gdb to one of the processes. Following are the steps that I performed with gdb: ... ... 0x00110416 in __kernel_vsyscall () Missing separate debuginfos, use: debuginfo-install glibc.i686 (gdb) dir /home/amarathe/mpi/svn_openmpi/ompi-trunk/ompi/mpi/c Source directories searched: /home/amarathe/mpi/svn_openmpi/ompi-trunk/ompi/mpi/c:$cdir:$cwd (gdb) break MPI_Barrier Breakpoint 1 at 0x155596 When gdb hits breakpoint 1, it jumps at the address but cannot find the source file for 'MPI_Barrier' definition. Breakpoint 1, 0x00155596 in PMPI_Barrier () from /home/amarathe/mpi/openmpi/openmpi-1.3.3_install/lib/libmpi.so.0 (gdb) s Single stepping until exit from function PMPI_Barrier, which has no line number information. main (argc=1, argv=0xbf9a1484) at smg2000.c:114 114 P = num_procs; (gdb) Is this the right approach? Thanks, Aniruddha On Mon, Sep 28, 2009 at 8:40 AM, Jeff Squyres <jsquy...@cisco.com> wrote: > You might want to just configure Open MPI with: > > ./configure CFLAGS=-g3 ... > > That will pass "-g3" to every Makefile in Open MPI. > > FWIW: I do variants on this technique and gdb is always able to jump to the > right source location if I "break MPI_Barrier" (for example). We actually > have a "--enable-debug" option to OMPI's configure, but it does turn on a > bunch of other debugging code that will definitely result in performance > degradation at run-time (one of its side effects is to add "-g" to every > Makefile). > > > > On Sep 28, 2009, at 5:57 AM, Aniruddha Marathe wrote: > > Hello, >> >> I am new to OpenMPI library and I am trying to step through common MPI >> communication calls using gdb. I attach gdb to one of the processes >> (using the steps mentioned on the OpenMPI Debugging FAQ page) and set >> a breakpoint on 'MPI_Barrier' and expect gdb to jump into the >> definition of MPI_Barrier function. >> >> I've manually added -g3 compilation flag to the Makefiles in some of >> the directories that I thought relevant ({ROOT}/ompi/mpi/c etc). I >> also specified the source file paths in gdb using the 'dir' command. >> However, gdb is unable to jump into the appropriate source location >> when it hits the breakpoint. >> >> Could anyone please let me know if I am missing something here? >> >> Thanks for looking into my post. >> >> Regards, >> Aniruddha >> _______________________________________________ >> users mailing list >> us...@open-mpi.org >> http://www.open-mpi.org/mailman/listinfo.cgi/users >> >> > > -- > Jeff Squyres > jsquy...@cisco.com > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users >