[OMPI users] freezing in mpi_allreduce operation

I am seeing mpi_allreduce operations freeze execution of my code on some moderately-sized problems. The freeze does not manifest itself in every problem. In addition, it is in a portion of the code that is repeated many times. In the problem discussed below, the problem appears in the 60th itera

Re: [OMPI users] freezing in mpi_allreduce operation

ust a mistake.) On Thu, Sep 8, 2011 at 4:17 PM, Greg Fischer wrote: > I am seeing mpi_allreduce operations freeze execution of my code on some > moderately-sized problems. The freeze does not manifest itself in every > problem. In addition, it is in a portion of the code that is repeated man

[OMPI users] OMPI error in MPI_Cart_create (in code that works with MPICH2)

I'm receiving the error posted at the bottom of this message with a code compiled with Intel Fortran/C Version 11.1 against OpenMPI version 1.3.2. The same code works correctly when compiled against MPICH2. (We have re-compiled with OpenMPI to take advantage of newly-installed Infiniband hardware

Re: [OMPI users] OMPI error in MPI_Cart_create (in code that works withMPICH2)

are many well-documented problems > because of the design of the MPI-2 Fortran 90 interface (which are currently > being addressed in MPI-3, if you care :-) ). More generally: "use mpi" will > catch *many* compile errors, but not *all* of them. > > But to answer your question succi

[OMPI users] error compiling OpenMPI 1.3.3 with Intel compiler suite 11.1 on Linux

I'm attempting to compile OpenMPI version 1.3.3 with Intel C/C++/Fortran version 11.1.046. Others have reported success using these compilers ( http://software.intel.com/en-us/forums/intel-c-compiler/topic/68111/). The line where compilation fails is included at the end of this message. I have a

Re: [OMPI users] error compiling OpenMPI 1.3.3 with Intel compilersuite 11.1 on Linux

d see how the quoting might get screwed up and end up > passing "Sep" (and following) as individual tokens rather than One Big Token > (including quotes). > > That's just a first guess -- can you check to see if this is happening? > > > > > On Sep 4, 2009, at 5

[OMPI users] best way to ALLREDUCE multi-dimensional arrays in Fortran?

(I apologize in advance for the simplistic/newbie question.) I'm performing an ALLREDUCE operation on a multi-dimensional array. This operation is the biggest bottleneck in the code, and I'm wondering if there's a way to do it more efficiently than what I'm doing now. Here's a representative exa

Re: [OMPI users] best way to ALLREDUCE multi-dimensional arrays in Fortran?

It looks like the buffering operations consume about 15% as much time as the allreduce operations. Not huge, but not trivial, all the same. Is there any way to avoid the buffering step? On Thu, Sep 24, 2009 at 6:03 PM, Eugene Loh wrote: > Greg Fischer wrote: > > (I apologize in ad

[OMPI users] strange performance fluctuations and problems with mpif90-vt

I'm seeing some sporadic strange behavior in one of our MPI codes. Here are selected portions of the output: --- | | |im |jm |km | phi0 | | iter | sync |mcalc || |grp|itn|loc|loc|loc|Max Error| NSR |t(s

[OMPI users] MPI-IO: reading an unformatted binary fortran file

Hello, I'm attempting to wrap my brain around the MPI I/O mechanisms, and I was hoping to find some guidance. I'm trying to read a file that contains a 117-character string, followed by a series records that contain integers and reals. The following code would read it in serial: --- character(l