简介:TheMOSIXextensionstotheLinuxOperatingSystemallowthecreationofhigh-performanceLinuxFarmsandanexcellentintegrationoftheseveralCPUsoftheFarm,whosecomputationalpowercanbefurtherlyinereasedandmademoreeffectivebynetorkingthemwithintheGRIDenvironment.Followingthisstrategy,westartedtoperformcomputationaltestsusingtwoindependentfarrmswithintheGRIDenvironment.Inparticular,weperformedapreliminaryevaluationofthedistributedcomputingefficiencywithaMOSIXLinuxfarminthesimulationofgravitationalwavesdataanalysisfromcoalescingbinaries.Tothistask,twodifferenttechniqueswerecompared.theclassicalmatchedfilterstechniqueandoneofitspossibleevolutions,basedonaglobaloptimisationtechnique.
简介:Aneverincreasingnumberofcomputersystems-mainlyPCs-requireelaboratedmanagementstrategiesandtools.InthecontributiontoCHEP'01wewillpresentanddiscussnewconceptsanddevelopmentsconcerningdirectoryservicesandassetmanagement,Wewillinparticularreportonfirstexperienceswithsystemscurrentlybeingimplemented.
简介:CongestioncontrolforpacketssentonanetworkisimportantforDAQsystemsthatcontainaneventbuilderusingswitchingnetworktechnologies.QualityofService(QoS)isatechniqueforcongestioncontrol.RecentLinuxreleasesprovideQoSinthekerneltomanagenetworktraffic.Wehaveanalyzedthepacket-lossandpacketdistributionfortheeventbuilderprototypeoftheAtlasTDAQsystem.WeusedPC/LinuxwithGigabitEthernetnetworkasthetestbed.TheresultshowedthatQoSusingCBQandTBFeliminatedpacketlossonUDP/IPtransferwhiletheUDP/IPtransferinbesteffortmadelotsofpacketloss.TheresultalsoshowedthattheQoSoverheadwassmall.WeconcludedthatQoSonLinuxperformedefficientlyinTCP/IPandUDP/IPandwillhaveanimportantroleoftheAtlasTDAQsystem.
简介:TheZEUSexperimenthasmigrateditsreconstructionandanalysisfarmstoaPC-basedenvironment.Morethanoneyearofexperiencehasbeenacquiredwithsuccessfuloperationofananalysisfarmdesignedforseveralhundredusers.Speciallydesignedsoftwarehasbeenusedtoproveidefastandreliableaccesstolargeamountsofdata(30TBintotal),AftertheongoingupgradeoftheHERAluminosity,higherrequirementswillariseintermsofdatastoragecapacityandthroughputrate,Thenecessityofabiggerdiskcachehasledtoconsiderationofsolutionsbasedoncommoditytechnology,PC-basedfileserversarebeingtestedasacost-effectivestoragesystem,Inthisarticlewepresentthehardwareandsoftwaresolutionsdeplogyedanddiscusstheirperformance.scalabilityandmaintenanceissues.
简介:TheDAQhardwareoftheISTRA+experimentconsistsoftheVMEsystemcratethatcontainstwoPCI-VMEbridgesinterfacingtwoPC'swithVME,externalinterruptsreceiver,thereadoutcontrollerfordedicatedfront-endelectronics,theread-outcontrollerbuffermemorymodule,theVME-CAMACinterface,andadditionalcontrolmodules,TheDAQcomputingconsistof6PC'srunningtheLinuxoperatingsystemandlinkedintoLAN.ThefirstPCservestheexternalinterruptsandacquiresthedatafromfront-endelectronics,Thesecondoneistheslowcontrolcomputer.TheremainingPC'shostthemonitoringanddataanalysissoftware.TheLinuxbasedDAQsoftwareprovidestheexternalinterruptsprocssing,thedataacquisition,recording,anddistributionbetweenmonitoringanddataanalysistasksrunningatDAQPC's.Themonitoringprogramsarebasedontwopackagesfordatavisualization:home-writtenonandtheROOTsystem.MySQlisusedasaDAQdatabase.
简介:AnaffordablesolutiontoTier-3RegionalCenter(RC)ispresentedinthistalk,asimpleprototypehasbeensetupforevaluationofthesystemperformance,thisprototypecanbeeasilyscaledtobiggerone.Asetofmeasurementshavebeenconductedinbothcomputerandnetworksystembehavioursinmultipleconcurrentlyrunningjobscontexts.Inthetalkthesemeasuredresultsaretalkedanddiscussed,includingsystemandnetworkeffectiveutilizationsandlimitations,andtheidentifiedbottlenecksindifferentnetworklayouts,andthecomparisonswithsimulation.
简介:Thedolly+isaLinuxapplicationprogramtoclonefilesanddiskpartitionimagefromaPCtomanyothers.Byusingseveraltechniquessuchaslogicalringconnection,multithreadingandpipelining,itcouldachievehighperformanceandscalability.Forexample,intypicalcondition,installationstoahundredPCstakesalmostequivalenttimefortwoPCs.TogetherwiththeIntelPXEandtheRedHatkickstart,automaticandveryfastsysteminstallationandupgradingcouldbeperformed.
简介:●目标检测因式分解(A)一、填空题(1)提公因式法、公式法、分组分解法、十字相乘法;(2)4;(3)-4x;(4)m2-2m+4;(5)x+1、x-1;(6)ax-6;(7)a-3;(8)y、5y;(9)25;(10)原式=25(5022-4982)=25(502+498)(502-498)=25×1000×4=100000.二、选择题(1)D;(2)x4-81=(x2+9)(x+3)(x-3),x3-27=(x-3)(x2+3x+9),x2-6x+9=(x-3)2,所以公因式是x-3,选B;(3)A;(4)D;(5)B;(6)C;(7)C;(8)D.三、把下列各式分解因式(1)8a2-2b2
简介:针对基础物理实验教学长期以来存在的许多弊端,分别从课程体系、课程内容、教学方法、教学手段等方面提出改进意见,旨在更好的达到基础物理实验教学的效果。