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From: Christian Kauhaus (ckauhaus_at_[hidden])
Date: 2007-06-01 04:25:34

Kees Verstoep <versto_at_[hidden]>:
>I am currently experimenting with OpenMPI in a multi-cluster setting
>where each cluster has its private Myri-10G/MX network besides TCP.

Very interesting topic. :)

>I see MX rather than tcp-level connections between clusters being
>tried, which across clusters fails in mx_connect/mx_isend (at the
>moment there is no inter-cluster support in MX itself). Besides "mx",
>I do include "tcp" in the network option lists of course.

It seems that the BTL does not realize that the two Myrinets are not
connected. We are currently working on getting the handling of all cases
with different TCP/IP networks right (public IPv4, private IPv4, IPv6),
but to my knowledge nobody has done a detailed evaluation on Open MPI in
multi-domain clusters with mixed networks (TCP+MX, TCP+IB, ...) yet.


Dipl.-Inf. Christian Kauhaus                               <><
Lehrstuhl fuer Rechnerarchitektur und -kommunikation 
Institut fuer Informatik * Ernst-Abbe-Platz 1-2 * D-07743 Jena
Tel: +49 3641 9 46376  *  Fax: +49 3641 9 46372   *  Raum 3217

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