CODEWITHSUNDEEP
fortranmpi
Richard Taylor
Richard Taylor

Reputation: 2752

Correct way to STOP with MPI

I'm using MPI, and at some points want to use STOP (or another method), to exit the program with an error message.

Right now, I'm doing something like this:

STOP 'Error'

But I have a feeling I'm doing something wrong. Do I need to call MPI_FINALIZE first? Is there something else to be doing?

Upvotes: 8

Views: 7210

Answers (3)

Youjun Hu
Youjun Hu

Reputation: 1334

Testing this on NERSC supercomupters, I found that

call MPI_FINALIZE(ierr)
stop

can not stop the whole program. The following works:

 call MPI_Abort(MPI_COMM_WORLD, errcode, ierr)
 stop

Upvotes: 2

Jonathan Dursi
Jonathan Dursi

Reputation: 50937

In a catastrophic error condition, the usual way to exit is call MPI_Abort(MPI_COMM_WORLD, errcode, ierr). In most implementations, this will kill all tasks. In less drastic situations you could make sure all the tasks know of the condition and then have them all excit more gracefully with an MPI_Finalize.

Upvotes: 12

suszterpatt
suszterpatt

Reputation: 8273

Take a look at MPI_Abort:

The behavior of MPI_ABORT (comm, errorcode),for comm other then MPI_COMM_WORLD, is implementation-dependent. One the other hand, a call to MPI_ABORT(MPI_COMM_WORLD, errorcode) should always cause all processes in the group of MPI_COMM_WORLD to abort.

Upvotes: 6

Related Questions