בס"ד
first thank you!
your program works with the command: "mpiexec -n 1 ./get_count"
your program works with the command: "mpiexec -n 1 ./get_count"
but when i put: "mpiexec -n 4 ./get_count" i receive:
what does it means?
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 <jeff.science@gmail.com
<mailto:jeff.science@gmail.com>>:
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
<wkliao@eecs.northwestern.edu <mailto:wkliao@eecs.northwestern.edu>>
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
<wkliao@eecs.northwestern.edu
<mailto:wkliao@eecs.northwestern.edu>>:
>
> 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
>
>
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> --
> בברכה, יוסף אלון
> 050-4916740
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--
Jeff Hammond
jeff.science@gmail.com <mailto:jeff.science@gmail.com>
http://jeffhammond.github.io/
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בברכה, יוסף אלון
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