Subject: [Boost-bugs] [Boost C++ Libraries] #10065: wait_any return with -1
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-05-21 13:20:42
#10065: wait_any return with -1
--------------------------------------------+---------------------
Reporter: florian <boost_error_wait88@â¦> | Owner: troyer
Type: Bugs | Status: new
Milestone: To Be Determined | Component: mpi
Version: Boost 1.55.0 | Severity: Problem
Keywords: |
--------------------------------------------+---------------------
I have a small example, where every process send his rank to rank 0. The
process with rank 0, should receive with ''irecv'' every message and wait
for it with ''wait_any''. But the ''wait_any'' function returns with -1. I
have seen two other tickets, which are marked as fixed/ solved. I think
they are not solved. If they are solve the documentation should be
changed, because if I make the same example with MPI_Waitany, the result
is completely different.
{{{
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <boost/mpi.hpp>
#include <iostream>
#include <string>
#include <boost/serialization/string.hpp>
#define MAXPROC 16 /* Max number of procsses */
int main(int argc, char* argv[]) {
int i, np, me, index;
const int tag = 42; /* Tag value for communication */
const int root = 0; /* Root process in broadcast */
boost::mpi::status status; /* Status object for non-blocing
receive */
boost::mpi::request recv_req[MAXPROC]; /* Request objects for non-
blocking receive */
int myname[5]; /* Local host name string */
int hostname[5]; /* Received host names */
int namelen;
boost::mpi::environment env; /* Initialize MPI */
boost::mpi::communicator world; /* Initialize MPI */
np = world.size(); /* Get nr of processes */
me = world.rank(); /* Get own identifier */
if (me == 0) { /* Process 0 does this */
std::cout <<"Process " << me << " broadcasting to all
processes\n";
boost::mpi::broadcast(world, me, 0);
std::cout <<"Process " << me<< " receiving from all other
processes\n";
for (i=1; i<np; i++) {
recv_req[i] = world.irecv(i,i,hostname[i]);
}
for (i=1; i<np; i++) {
status = wait_any(recv_req,recv_req +5 ).first;
std::cout<<"Received a message from process "<<
status.source() << " tag " << status.tag() << std::endl;
}
std::cout <<"Ready\n";
}
else {
int y;
boost::mpi::broadcast(world, y, 0);
sleep(me%3+1);
MPI_Send (myname, namelen, MPI_CHAR, 0, tag, world);
}
world.barrier();
~world;
return 0;
}
}}}
-- Ticket URL: <https://svn.boost.org/trac/boost/ticket/10065> Boost C++ Libraries <http://www.boost.org/> Boost provides free peer-reviewed portable C++ source libraries.
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