topic MPI delayed stdout in Intel® MPI Library

MPI delayed stdout

italo1337 — Mon, 29 Oct 2012 15:11:35 GMT

When I run my MPI code, the printf's are not displayed immediately. They are displayed all at once when the program terminates.

Is there a way to remove this delay and print things immediately?

It italo,

James_T_Intel — Tue, 30 Oct 2012 14:22:55 GMT

It italo, Does your operating system buffer output? Sincerely, James Tullos Technical Consulting Engineer Intel® Cluster Tools

When I run the program

italo1337 — Tue, 30 Oct 2012 14:29:19 GMT

When I run the program without mpiexec, it doesn't buffer. It displays the output immediately. When I use mpiexec, it only shows the result when the program finishes. It happens only on Windows 7. On Linux it's ok.

Hi italo,

James_T_Intel — Tue, 30 Oct 2012 14:35:59 GMT

Hi italo, Got it. I'm seeing the same behavior, let me see if there's a simple fix for this. Sincerely, James Tullos Technical Consulting Engineer Intel® Cluster Tools

Hi italo,

James_T_Intel — Tue, 30 Oct 2012 14:41:16 GMT

Hi italo, Are you flushing stdout after your printf calls? Sincerely, James Tullos Technical Consulting Engineer Intel® Cluster Tools

Thank you. fflush(stdout)

italo1337 — Tue, 30 Oct 2012 15:02:52 GMT

Thank you. fflush(stdout) worked.

Hi italo,

James_T_Intel — Tue, 30 Oct 2012 15:06:56 GMT

Hi italo, Good. Please feel free to contact us again if there are any future concerns. Sincerely, James Tullos Technical Consulting Engineer Intel® Cluster Tools