[mpich-discuss] uninitialized MPI_Status object

[יוסף אלון]

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 <raffenet at mcs.anl.gov>:

> 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 at gmail.com
>> <mailto:jeff.science at 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 at eecs.northwestern.edu <mailto:wkliao at 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 at eecs.northwestern.edu
>>         <mailto:wkliao at 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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>>          >
>>          > --
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>>
>>
>>     --
>>     Jeff Hammond
>>     jeff.science at gmail.com <mailto:jeff.science at gmail.com>
>>     http://jeffhammond.github.io/
>>
>>     _______________________________________________
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>>
>>
>>
>> --
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>> 050-4916740
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>>
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-- 
בברכה, יוסף אלון
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