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Subject: Re: [OMPI users] Trapping fortran I/O errorsleavingzombiempiprocesses
From: Laurence Marks (L-marks_at_[hidden])
Date: 2010-02-06 22:24:49


The following code reproduces the problem for mpif90/ifort
11.1/openmpi-1.4.1. With an empty test.input (touch test.input) some
not reproducible number of zombies processes are created.

        include "mpif.h"
        call MPI_INIT(ierr)
        call MPI_COMM_RANK(MPI_COMM_WORLD, irank, ierr)
        open (unit=10,file='test.input')
        if(irank.lt.3)then
                read(10,1,err=20)ii
        else
                read(10,1)ii
        endif
20 write(6,*)irank,ii
1 format(i4)
        call MPI_FINALIZE(ierr)
        end

N.B., if I deliberately create a format error for the read no zombies remain.

-- 
Laurence Marks
Department of Materials Science and Engineering
MSE Rm 2036 Cook Hall
2220 N Campus Drive
Northwestern University
Evanston, IL 60208, USA
Tel: (847) 491-3996 Fax: (847) 491-7820
email: L-marks at northwestern dot edu
Web: www.numis.northwestern.edu
Chair, Commission on Electron Crystallography of IUCR
www.numis.northwestern.edu/
Electron crystallography is the branch of science that uses electron
scattering and imaging to study the structure of matter.