Hi Eric, There isn’t a way of doing that at the moment with MPICH (I’m not sure if any particular OFI providers have support for this through environment variables or something else). It will open whichever one OFI gives you first (assuming all other capability bits are the same). Thanks, Wesley

On Feb 18, 2019, at 1:40 PM, eric--- via discuss <[email protected]> wrote:

Hi there,

I'm using MPICH with ch4:ofi, and I'm wondering how to select which fabric/domain MPICH will open. I can select the provider with MPIR_CVAR_OFI_USE_PROVIDER, but suppose that the provider has two disjoint fabrics with equivalent capabilities. E.g., suppose I have two ethernet NICs connected to private networks:

provider: sockets fabric: 192.168.1.0/24 domain: eth0 version: 2.0 type: FI_EP_RDM protocol: FI_PROTO_SOCK_TCP provider: sockets fabric: 10.0.1.0/24 domain: eth1 version: 2.0 type: FI_EP_RDM protocol: FI_PROTO_SOCK_TCP

Is there a tunable to pick which will be used?

Thanks, Eric _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss