Nitu -- We actually try hard not to do students' homework for them on this list. We are more than willing to *help*, but please don't just send your program to us and say "fix it for me." Remember that we are volunteers on this list; people are inspired to help others when it is obvious that they have first tried to help themselves.
For example: a good bug report provides all kinds of information, such as: - what are you trying to do / what is the program supposed to do? - what exactly is going wrong? - be as specific as possible - what error messages do you see? - what parts are you confident *are* working correctly? - ...etc. - what environment are you working in? - what kind of machine(s) are you using? - what operating system are you using? - what network are you using? - how many machines are you using? - what version of Open MPI are you using? - ...etc. In short: without more information, we cannot help you. > On Nov 17, 2017, at 7:51 PM, Gilles Gouaillardet > <gilles.gouaillar...@gmail.com> wrote: > > The easiest way to debug a code is to use a parallel debugger such as > DDT or TotalView. > Note your vendor might provide its own parallel debugger. > > You only need to compile your application with the '-g -O0' flag, run > it under the debugger, and wait for the crash. > > > An other option is to do post mortem debugging. > Most sites have a default core size equal to zero, so you need to > ulimit -c unlimited > and then run your application > then you can > gdb <binary name> <core file name> > the 'bt' command can be used to visualize the stack and understand > where the crash occurred. > > > I do not know how many MPI tasks you plan to use, but so far it does > not crash with 2 MPI taks. > With other task counts (i tested 1, 3 and 4), there are several > crashes/errors that are caused by your application > (e.g. the root cause is not Open MPI) > > > > Cheers, > > Gilles > > On Fri, Nov 17, 2017 at 4:31 PM, Nitu > <yalamanchi.nit...@students.iiit.ac.in> wrote: >> >> >> >> -------- Forwarded Message -------- >> Subject: <sub.> Request to debug the code >> Date: Sat, 18 Nov 2017 04:50:42 +0530 >> From: Nitu <yalamanchi.nit...@students.iiit.ac.in> >> To: users@lists.open-mpi.org >> >> I've been trying to find the reason for the error,but unable to do so.It is >> showing Signal: segmentation fault and Signal code: Address not >> mapped.Please help me debug the code. >> >> Thanks, >> >> _______________________________________________ >> users mailing list >> users@lists.open-mpi.org >> https://lists.open-mpi.org/mailman/listinfo/users > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/users -- Jeff Squyres jsquy...@cisco.com _______________________________________________ users mailing list users@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/users
