BEGIN:VCALENDAR PRODID:-//Microsoft Corporation//Outlook MIMEDIR//EN VERSION:1.0 BEGIN:VEVENT DTSTART:20111116T011500Z DTEND:20111116T030000Z LOCATION:WSCC North Galleria 2nd/3rd Floors DESCRIPTION;ENCODING=QUOTED-PRINTABLE:ABSTRACT: The economy of scale offers cloud computing unlimited cost effective processing potentials. Theoretically, prices under fair market conditions should reflect the most reasonable costs of computations. The fairness is in theory ensured by the market forces. While there is no lack of incentives for the cloud provider to offer auction-based computing platform, using these volatile platform for practical computing is a challenge. This paper reports a methodology and a toolkit designed to tame the challenges for MPI applications.=0AWe introduce a formal model, then a HPC application toolkit, named SpotMPI, to facilitate the practical execution of real MPI applications on volatile auction-based cloud platforms. Our models capture the intrinsic dependencies between critical time consuming elements by leveraging instrumented performance parameters and publically available resource bidding histories. We study algorithms with different computing v.s. communication complexities. Our results show non-trivial insights into the optimal bidding and application scaling strategies. SUMMARY:SpotMPI: Auction-based HPC on the Amazon Cloud PRIORITY:3 END:VEVENT END:VCALENDAR