The Design and Implementation of Open-MX

Event Sponsor: 
Mathematics and Computer Science Division Seminar
Start Date: 
Dec 10 2008 (All day)
Building 221, Room A216
Argonne National Laboratory
Brice Goglin
Speaker(s) Title: 
Institut National de Recherche en Informatique et en Automatique
Dave Goodell

Open-MX is a message passing stack that offers the Myrinet Express features on top of regular Ethernet hardware. We will see what problems one can encounter when trying to mimic high-speed network capabilities without having advanced hardware support underneath. Several solutions based on I/OAT copy offload, interrupt affinities, and multiqueue support will be discussed. Finally, we will see how working on intra-node communication in Open-MX lead to designing the knem kernel module which aims at improving large message performance in MPICH2/Nemesis.

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