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PRODID:-//Microsoft Corporation//Outlook MIMEDIR//EN
VERSION:1.0
BEGIN:VEVENT
DTSTART:20111118T000000Z
DTEND:20111118T003000Z
LOCATION:TCC 305
DESCRIPTION;ENCODING=QUOTED-PRINTABLE:ABSTRACT: A low-diameter, fast interconnection network is going to be a pre-requisite for=0Abuilding exascale machines. A two-level direct network has been proposed by=0Aseveral groups as a scalable design for future machines. The presence of multiple levels in this design leads to hot-spots on a few links for applications where grouping processes together is optimal for minimizing total communication volume. This is especially true for communication graphs with a small number of=0Aneighbors per task. In this paper, we explore intelligent topology aware mappings=0Afor different communication patterns on the physical topology to identify cases =0Athat minimize link utilization. We also analyze the trade-offs between using direct=0Aand indirect routing with different mappings. We use simulations to study=0Acommunication and overall performance of applications on two-level direct=0Anetworks since there are no installations of such networks yet. This study=0Araises interesting issues regarding choice of job scheduling, routing and=0Amapping.
SUMMARY:Avoiding hot-spots on two-level direct networks
PRIORITY:3
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