Characterizing Parallel File-access Patterns on a

High-perforniutice pat allal file systewis are needed to surish tretnrndouc I/c) requiremetits c,f parallol scientijic upplicatioti, The dP\igti of such high-petforniatice pcitalIC i file rjsterns iiqwtid\ oii U < oniprelrerizive understandrrig of the expec.ted ivorklaad but TO fur tlirse how been wti fc IL usage \tude, of multiprocessr~r file Jysteriu Ihis piraer is part of thP CHARlSMA prorcct, M hrth ititetid, to fill thi\ i oid 01 nicasiiritig seal fil,. nsteni it*orklo4 )ti pcirdlel muc.hineF. in particular; /I( we pscwtir reciilts Jrorii the C'h4- 5 ut the NLitiorial C L titer for Si(l'ctLOtIIi)UI1tIg Applic otcori 7. Our tewlts ut utiiqiie becuuse vie ollvct infosniatron about niurh ei ,,n individual I/O rtsqurxt from the wx of lobs runnitig 011 the machitie. Atidysi F o( the tnicec leads to I at iiu ri I oinnieiidutiorir for pariillel file-ssctr tu de.ngti

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