Re: [OMPI users] UC EXTERNAL: Re: How to set up state-less node /tmpfor OpenMPI usage

Indeed, my terminology is inexact. I believe you are correct; our diskless nodes use tmpfs, not ramdisk. Thanks for the clarification! On 11/4/11 11:00 AM, Rushton Martin wrote: There appears to be some confusion about ramdisks and tmpfs. A ramdisk sets aside a fixed amount of memory for its

Re: [OMPI users] MPI on MacOS Lion help

I just checked my laptop (also running Lion) and I do have gcc at /usr/bin and it is linked to /usr/bin/gcc-4.2. I just checked again on my Mac Pro and there is no gcc in /usr/bin although there is a /usr/bin/gcc-3.3, probably left over from an earlier OS or Xcode. I downloaded and installed

Re: [OMPI users] EXTERNAL: Re: How to set up state-less node /tmp for OpenMPI usage

Thanks, Ralph, > Having a local /tmp is typically required by Linux for proper operation as > the OS itself needs to ensure its usage is protected, as was > previously > stated and is reiterated in numerous books on managing Linux systems. There is a /tmp, but it's not local. I don't know

Re: [OMPI users] MPI on MacOS Lion help

I think you have something wrong with your Xcode install; on my Lion machine, gcc is installed in /usr/bin as always. Also, on OS X, you should never have to set LD_LIBRARY_PATH. Brian On 11/4/11 3:36 PM, "Ralph Castain" wrote: >Just glancing at the output, it appears to be

Re: [OMPI users] MPI on MacOS Lion help

Just glancing at the output, it appears to be finding a different gcc that isn't Lion compatible. I know people have been forgetting to clear out all their old installed software, and so you can pick old things up. Try setting your path and ld_library_path variables to point at the Xcode gcc.

[OMPI users] MPI on MacOS Lion help

I had downloaded and installed OpenMPI on my Mac OS-X 10.6 machine a few months ago. I ran the configure and install commands from the FAQ with no problems. I recently upgraded to Max OS-X 10.7 (Lion) and now when I run mpicc it cannot find the standard C library headers (stdio.h, std lib.h…)

Re: [OMPI users] UC EXTERNAL: Re: How to set up state-less node /tmpfor OpenMPI usage

There appears to be some confusion about ramdisks and tmpfs. A ramdisk sets aside a fixed amount of memory for its exclusive use, so that a file being written to ramdisk goes first to the cache, then to ramdisk, and may exist in both for some time. tmpfs however opens up the cache to programs so

Re: [OMPI users] EXTERNAL: Re: How to set up state-less node /tmp for OpenMPI usage

I should have been more careful. When we first started using OpenMPI, version 1.4.1, there was a bug that caused session directories to be left behind. This was fixed in subsequent releases (and via a patch for 1.4.1). Our batch epilogue still removes everything in /tmp that belongs to the

Re: [OMPI users] EXTERNAL: Re: How to set up state-less node /tmp for OpenMPI usage

On Nov 4, 2011, at 10:19 AM, Blosch, Edwin L wrote: > OK, I wouldn't have guessed that the space for /tmp isn't actually in RAM > until it's needed. That's the key piece of knowledge I was missing; I really > appreciate it. So you can allow /tmp to be reasonably sized, but if you > aren't

Re: [OMPI users] EXTERNAL: Re: How to set up state-less node /tmp for OpenMPI usage

OK, I wouldn't have guessed that the space for /tmp isn't actually in RAM until it's needed. That's the key piece of knowledge I was missing; I really appreciate it. So you can allow /tmp to be reasonably sized, but if you aren't actually using it, then it doesn't take up 11 GB of RAM. And

Re: [OMPI users] EXTERNAL: Re: How to set up state-less node /tmp for OpenMPI usage

That isn't the situation, Terry. We had problems with early OMPI releases, particularly the 1.2 series. In response, the labs wrote an epilogue to ensure that the session directories were removed. Executing the epilogue is now standard operating procedure, even though our more recent releases

Re: [OMPI users] Troubles using MPI_Isend/MPI_Irecv/MPI_Waitany and MPI_Allreduce

Sorry for the delay in replying. I think you need to use MPI_INIT_THREAD with a level of MPI_THREAD_MULTIPLE instead of MPI_INIT. This sets up internal locking in Open MPI to protect against multiple threads inside the progress engine, etc. Be aware that only some of Open MPI's transports are

Re: [OMPI users] Technical details of various MPI APIs

Sorry for the delay in replying. We don't have any formal documentation written up on this stuff, in part because we keep optimizing and changing the exact makeup of wire protocols, etc. If you have any specific questions, we can try to answer them for you. On Oct 21, 2011, at 2:45 PM, ramu

Re: [OMPI users] Problem-Bug with MPI_Intercomm_create()

After some discussion on the devel list, I opened https://svn.open-mpi.org/trac/ompi/ticket/2904 to track the issue. On Oct 25, 2011, at 12:08 PM, Ralph Castain wrote: > FWIW: I have tracked this problem down. The fix is a little more complicated > then I'd like, so I'm going to have to ping

Re: [OMPI users] problem with mpirun

We really need more information in order to help you. Please see: http://www.open-mpi.org/community/help/ On Nov 3, 2011, at 7:37 PM, amine mrabet wrote: > i instaled last version of openmpi now i have this error > I > t seems that [at least] one of the processes that was started with >

Re: [OMPI users] EXTERNAL: Re: How to set up state-less node /tmp for OpenMPI usage

David, are you saying your jobs consistently leave behind session files after the job exits? It really shouldn't even in the case when a job aborts, I thought, mpirun took great pains to cleanup after itself. Can you tell us what version of OMPI you are running with? I think I could see

Re: [OMPI users] EXTERNAL: Re: How to set up state-less node /tmp for OpenMPI usage

% df /tmp Filesystem 1K-blocks Used Available Use% Mounted on - 12330084822848 11507236 7% / % df / Filesystem 1K-blocks Used Available Use% Mounted on - 12330084822848 11507236 7% / That works out to 11GB.

Re: [OMPI users] EXTERNAL: Re: How to set up state-less node /tmp for OpenMPI usage

Thanks very much, exactly what I wanted to hear. How big is /tmp? -Original Message- From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On Behalf Of David Turner Sent: Thursday, November 03, 2011 6:36 PM To: us...@open-mpi.org Subject: Re: [OMPI users] EXTERNAL: Re: How