Newsgroups: comp.parallel.mpi
From: "Nathan A. Baker" <nbaker@chemcca10.ucsd.edu>
Subject: Core dump on MPI_Finalize()
Organization: The Avant-Garde of the Now, Ltd.
Date: Thu, 2 Oct 1997 09:01:16 -0700
Mime-Version: 1.0
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Message-ID: <Pine.SGI.3.91.971002085629.9652A-100000@chemcca10.ucsd.edu>

Hello all --

I have a question regarding the calls made inside MPI_Finalize().  I've
been writing a parallel application C++ which was working fine until I wrapped
the cout ostream to stdout to an object that only writes to stdout from PE
0.  This object (and associated operators) work fine, but when
MPI_Finalize() is called at the end of my program I get a core dump.  The
class declaration for my object is below... Does anyone have any ideas why
this might be happening?  Thanks!

    class out : public ostream {        // a class to wrap the cout object
						    // and comtrol console output such 
                                        // that only PE 0  writes to stdout
    public:
        int my_rank;                    // rank of PE with out object
        Setup(int n) {                  // function called by Parallel_List
                                        // constructor.  this gets rank of
                                        // calling PE  as argument
            my_rank = n;
            cout << my_rank << " just called out::Setup()." << endl;
        }
        template <class T> out &operator<<(T o) {
            if (my_rank==0) cout << o;
            return *this;
        }
    } pcout;                            // object


----------------------------------------
Nathan Baker * nbaker@chemcca10.ucsd.edu

A mosquito cried out in pain
"A chemist has poisoned my brain!"
The cause of his sorrow
was para-dichlorodiphenyltrichloroethane
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