[OMPI users] MX/BTL eager_limit/min_send_size

Hi, I am currently working on a parallel app that shows some issues using MX/BTL (not MTL) with the current trunk version of OpenMPI. Basically, for its communication the app needs to do a lot of random <= 8KB MPI_Isend()s which are polled away using MPI_Iprobe() and MPI_Recv(). The async send

[OMPI users] mpi broadcast

Hi, Is there a special way to broadcast a 2D array, or just using the standart MPI_Bcast is enough? When I try to send/broadcast 2D arrays every time operation is terminated, and get a message like: "rank 2 in job 71 X_49783 caused collective abort of all ranks exit status of rank 2: k

Re: [OMPI users] mpi broadcast

Hi Sefa, I presume you are talking about C or C++. If yes, it depends how you allocated 2D array. If it is not continuous data (i.e. 1D array you are accessing in 2D manner) - you have to define special datatype. Hope this helps, Jelena Sefa Arslan wrote: Hi, Is there a special way to broadc

[OMPI users] How to build and use checkpoint/restart fault tolerance in Open MPI.

Hello, I'm Hiep, I'm trying to use checkpoint/restart feature in Open MPI. I had read information about this feature in https://svn.open-mpi.org/trac/ompi/wiki/ProcessFT_CR and Open-MPI-FT-CR-Draft-v1.pdf. I had built Open MPI from "trunk" which gotten by Subversion. But I don't know how to enable

Re: [OMPI users] How to build and use checkpoint/restart fault tolerance in Open MPI.

Hello, There are a few things you need to do to build Open MPI with Checkpoint/Restart support. By default Open MPI is configured without checkpoint/restart support. 1) Make sure you have BLCR successfully installed and loaded on your system(s) 2) configure Open MPI with the "--with-ft=cr"

Re: [OMPI users] How to build and use checkpoint/restart fault tolerance in Open MPI.

I just updated the Users Guide on the wiki. I added the following sections: - Compiling and Building - Example Checkpoint/Restart Use Cases Let me know if you have any trouble with this work. Cheers, Josh On Aug 21, 2007, at 1:46 PM, Josh Hursey wrote: Hello, There are a few things you n

[OMPI users] openmpi realloc() holding onto memory when glibc doesn't

The realloc included with openmpi 1.2.3 is not releasing memory to the OS and is causing apps to go into swap. Attached is a little test program that shows calls to realloc not releasing the memory when compiled using mpicc, but when compiled directly with gcc (or icc) calling realloc() frees any

[OMPI users] building static and shared OpenMPI libraries on MacOSX

According to the OpenMPI FAQ, specifying the config option --enable-static without specifying --disable-shared should build both shared and static versions of the libraries. When I tried these options on MacOSX 10.4.10 with OpenMPI 1.2.3, however, the following lines in the config output seem to im