topic Hi Georg, in Software Archive

IDB in parallel application

Lyndon_L_ — Fri, 28 Sep 2012 06:18:52 GMT

Hi,

I am running a parallel application over 128 cores and it always crashed in the core#48. Is there a way to use IDB in core#48 only? The IDB may be not a good debugger for parallel application.

Cheers,

Lyndon.

Hello Lyndon,

Georg_Z_Intel — Fri, 28 Sep 2012 09:01:13 GMT

Hello Lyndon, which version of IDB are you using and is your parallel application using shared memory (OpenMP, Intel(R) TBB, ...) or distributed memory (MPI) technology? Thank you & best regards, Georg Zitzlsberger

Hi Georg,

Lyndon_L_ — Sun, 30 Sep 2012 21:10:35 GMT

Hi Georg, The parallel application (Fortran) is using MPI and is compile with openmpi 1.4.3. I assume that the gdb is included in the distribution of Intel compiler. The version of Intel compiler is 11.1.046. Cheers, Lyndon.

Hello Lyndon,

Georg_Z_Intel — Mon, 01 Oct 2012 10:00:48 GMT

Hello Lyndon, IDB is not validated against Open MPI (started via mpiexec/mpirun); it only supports Intel(R) MPI. In addition, 11.1.046 is quite old and IDB has seen lots of stability improvements over the last versions, also regarding Intel(R) MPI with the last update: Intel(R) Composer XE 2011 Update 12. However, debugging of individual processes should work. If you want to do that (e.g. for just one process on a node) you can do the following: - Start the MPI processes - Log into the host which runs the process you like to debug (rank/host 48 in your example) - Start IDB and attach to the running process In that case you also need to make sure that the process does not run away before you attach, e.g. via a busy wait in the code. GDB is not part of our suites/products. You need to download it separately. Thank you & best regards, Georg Zitzlsberger