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Subject: Re: [OMPI users] Unable to connect to a server using MX MTL with TCP
From: Scott Atchley (atchley_at_[hidden])
Date: 2010-06-05 07:52:40

On Jun 4, 2010, at 7:18 PM, Audet, Martin wrote:

> Hi OpenMPI_Users and OpenMPI_Developers,
> I'm unable to connect a client application using MPI_Comm_connect() to a server job (the server job calls MPI_Open_port() before calling by MPI_Comm_accept()) when the server job uses MX MTL (although it works without problems when the server uses MX BTL). The server job runs on a cluster connected to a Myrinet 10G network (MX 1.2.11) in addition to an ordinary Ethernet network. The client runs on a different machine, not connected to the Myrinet network but accessible via the Ethernet network.

Hi Martin,

I do not think this is a supported scenario. George or Jeff can correct me, but when you use the MX MTL you are using the pml cm and not the pml ob1. The BTLs are part of ob1. When using the MX MTL, it cannot use the TCP BTL.

You only solution would be to use the MX BTL.