Hello,
In the case of single process the MPI_Ibarrier call fails (seg. fault).
Request object does not initialized in this function (LibNBC is not
called for it).
The following example fails on Open MPI 1.9a1r26779:
$ cat ibarrier_test.c
#include <mpi.h>
int main(int argc, char **argv)
{
MPI_Request req;
MPI_Status status;
MPI_Init(&argc, &argv);
MPI_Ibarrier(MPI_COMM_WORLD, &req);
/* MPI_Wait will crash. */
MPI_Wait(&req, &status);
MPI_Finalize();
return 0;
}
$ mpiexec -n 1 ./ibarrier_test
[mkws:26288] *** Process received signal ***
[mkws:26288] Signal: Segmentation fault (11)
[mkws:26288] Signal code: Address not mapped (1)
[mkws:26288] Failing at address: 0x58
[mkws:26288] [ 0] /lib64/libpthread.so.0() [0x3d6040f500]
[mkws:26288] [ 1]
/home/mkurnosov/opt/openmpi-1.9a1r26779/lib/libmpi.so.0(ompi_request_default_wait+0x17)
[0x7f75d824c707]
[mkws:26288] [ 2]
/home/mkurnosov/opt/openmpi-1.9a1r26779/lib/libmpi.so.0(MPI_Wait+0x5d)
[0x7f75d8276e0d]
[mkws:26288] [ 3] ./ibarrier_test(main+0x46) [0x40089a]
[mkws:26288] [ 4] /lib64/libc.so.6(__libc_start_main+0xed) [0x3d5f82169d]
[mkws:26288] [ 5] ./ibarrier_test() [0x400799]
[mkws:26288] *** End of error message ***
--
Mikhail Kurnosov
Computer Systems Department
Siberian State University of Telecommunications and Information Sciences
Address: 630102, 86 Kirova str., Novosibirsk, Russia
Email: mkurno...@gmail.com
http://cpct.sibsutis.ru/~mkurnosov
