[mvapich-discuss] RE: Problems with hostname resolution and MPI_INIT() (Mike Heinz)

[Mike Heinz]

Heh. I'm glad to know we aren't the only ones with this issue - but it gets even weirder. I've conclusively shown that removing the localhost record solves the problem but adding a faulty localhost record doesn't cause the problem in a previously working machine!

So, there must be an additional circumstance that has to occur to trigger the issue.

--
Michael Heinz
Principal Engineer, Qlogic Corporation
King of Prussia, Pennsylvania
From: Terrence.LIAO at total.com [mailto:Terrence.LIAO at total.com]
Sent: Wednesday, January 14, 2009 8:27 AM
To: Mike Heinz; mvapich-discuss at cse.ohio-state.edu
Cc: Terrence.LIAO at total.com
Subject: Re: Problems with hostname resolution and MPI_INIT() (Mike Heinz)


Mike,

We have the same problem before (posted in mvapich-discuss Digest, Vol 37, Issue 1) and just like you, I dug into the mvapich code and modified the get_host_id().  System admin told me, it is a normal practice to put hostname to 127.0.0.1 entry just like yours. Of course this the culprit.  Later on, to resolve a sendmail conflict, system admin removed the hostname from the 127.0.0.1 entry and created the real IP to hostname entry on /etc/hosts. Of course, with this, no more mvapich code change for me.  May be the solution to this is let mvapich install guide to advise or recommend to create entry for hostname in /etc/hosts, and to warn the potential problem if added it into 127.0.0.1. (May be this is already been done and, well, I have to admit that I did not read the entire install guide. )

Thank you very much.

-- Terrence
--------------------------------------------------------
Terrence Liao, Ph.D.
Research Computer Scientist
TOTAL E&P RESEARCH & TECHNOLOGY USA, LLC
1201 Louisiana, Suite 1800, Houston, TX 77002
Tel: 713.647.3498  Fax: 713.647.3638
Email: terrence.liao at total.com
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