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Subject: Re: [OMPI users] Bug report [?] on spawn processes - blocking when morethan one Send/Recv
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2009-03-27 22:04:28

It does not hang for me...

But I do notice one odd thing in your extended program: you send 3
characters of the string "hi2" -- that will not include the trailing \0.

You might want to send 4 characters to ensure to include the trailing

On Mar 25, 2009, at 9:52 AM, Lionel Gamet wrote:

> Dear openmpi users and developers,
> I encounter dead-lock problems with spawn processes in openmpi, as
> soon as more than one Send/Recv operation is done.
> The test case I used has been extracted from the MPICH2 examples. It
> is
> a simple parent/child program. The original version (see attached file
> parent+child_from_MPICH2.tar.gz) works well under openmpi.
> I use commands in run.cmd to compile and execute this example.
> I have tried to add one more communication by duplicating the send/
> recv
> calls of the original MPICH2 source (see modified files in attached
> tar
> archive parent+child_with_more_send_recv.tar.gz) and get dead-lock
> problems when executing this modified version ...
> Can anybody reproduce this ? I am using openmpi version 1.3 on a
> Linux CentOS 5.2 (i386), with all updates of the distribution done.
> See also attached file ompi_info.txt.gz (result of the command
> ompi_info
> --all).
> Thanks in advance for any hints,
> Best regards
> Lionel
> <parent+child_from_MPICH2.tar.gz><parent
> +
> child_with_more_send_recv
> .tar.gz><ompi_info.txt.gz><Lionel_Gamet.vcf><ATT7299515.txt>

Jeff Squyres
Cisco Systems