בס"ד first thank you! your program works with the command: "mpiexec -n 1 ./get_count" but when i put: "mpiexec -n 4 ./get_count" i receive: [image: תמונה מוטבעת 1] what does it means? 2016-03-30 16:56 GMT+03:00 Kenneth Raffenetti <[email protected]>:

Try "mpiexec -n 1 ./get_count".

On 03/30/2016 08:46 AM, יוסף אלון wrote:

...

i don't know why, but the first command works and the second command isnt. i have the following error: תמונה מוטבעת 1

what this means?

2016-03-28 21:15 GMT+03:00 Jeff Hammond <[email protected] <mailto:[email protected]>>:

I created a ticket for this: https://trac.mpich.org/projects/mpich/ticket/2332.

Jeff

On Mon, Mar 28, 2016 at 10:26 AM, Wei-keng Liao <[email protected] <mailto:[email protected]>> wrote:

My test program can be compiled with command "mpicc get_count.c -o get_count" and run "mpiexec -n 4 get_count". For correct (expected) result, nothing will be printed on stdout. Otherwise, error messages will be printed.

My point is MPI_Get_count does not report correct result because MPI collective I/O call fails to initialize the MPI_Status object.

I found that OpenMPI and earlier version of MPICH (2-1.2.1) can run this test code correctly.

The test failed when I ran MPICH 3.1.4 and the current from GIT repo.

Wei-keng

On Mar 26, 2016, at 3:21 PM, יוסף אלון wrote:

> בס"ד > > becuse all the command confusion. > which command should i put to run the above code? > > 2016-03-26 3:31 GMT+03:00 Wei-keng Liao <[email protected] <mailto:[email protected]>>: > > I notice an uninitialized MPI_Status object can make MPI_Get_count return a wrong result, > when the data amount in the MPI operation is zero (although I only checked MPI-IO). > Attached is a test program that uses MPI collective read where only root process has > non-zero length data to read. The expected result from MPI_Get_count is 0 for all > non-root process. To mimic an uninitialized MPI_Status object, I call memset to make > the object non-zero. > > Here is the code fragment. > > if (rank == 0) len = 10; > else len = 0; > > MPI_File_read_all(fh, buf, len, MPI_BYTE, &status); > > MPI_Get_count(&status, MPI_BYTE, &get_size); > > For process rank > 0, get_size may not be 0. > > > Wei-keng > > > _______________________________________________ > discuss mailing list [email protected] <mailto: [email protected]> > To manage subscription options or unsubscribe: > https://lists.mpich.org/mailman/listinfo/discuss > > > > -- > בברכה, יוסף אלון > 050-4916740 > _______________________________________________ > discuss mailing list [email protected] <mailto: [email protected]> > To manage subscription options or unsubscribe: > https://lists.mpich.org/mailman/listinfo/discuss

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-- Jeff Hammond [email protected] <mailto:[email protected]> http://jeffhammond.github.io/

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_______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss

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-- בברכה, יוסף אלון 050-4916740 _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss