[mpich-discuss] File I/O causing collective abort of all ranks

[William Gropp]

Is this the *exact* code?  If so, the problem is that both the do loop  
and the implied loop in the write statement refer to the same variable  
- i (as in EYE), instead of one being a loop over j (JAY) and one over  
i (EYE).  j (JAY) may not be set, or set out-of-range.

If this is just a typo in the example, then ignore this note :) .  But  
in that case, it would help to see the exact code.

Bill

On Sep 23, 2008, at 12:13 PM, Brian Harker wrote:

> Hello list-
>
> I have a problem with process 0 being able to open a file for writing
> and subsequently write to it.  The pertinent section of code looks as
> follows:
>
> ========================================
> if ( proc_id == 0 ) then
>
>  open( unit = 1, file = "fubar.dat", status="new" )
>  do i = 1, ny
>    write(1,*) ( array(i,j), i = 1, nx )
>  end do
>  close(1)
>
> end if
> ========================================
>
> When this part of the code is reached, the program seems to hang for a
> long time while trying to open the file, then spits out the following
> error message:
>
> rank 0 in job 11  $HOSTNAME_#####  caused collective abort of all  
> ranks
>   exit status of rank 0: killed by signal 9
>
> I am confused about this error, because it is seemingly isolated to
> this particular write-to-file by process 0.  During execution, my
> slave processes write out other files using this exact same syntax.
> Has anyone run across this?  I can't seem to find any useful
> information on the interweb.  I have run into this problem with both
> MPICH2-1.0.6p1 and MPICH2-1.0.7.  I am using the Intel fortran
> compiler, ifort 10.1.012.
>
> Thanks in advance for any input!
>
>
>
> --
> Cheers,
> Brian
> brian.harker at gmail.com
>
>
> "In science, there is only physics; all the rest is stamp-collecting."
> -Ernest Rutherford
>

William Gropp
Paul and Cynthia Saylor Professor of Computer Science
University of Illinois Urbana-Champaign