并行程序设计 中文课件 08 基于消息传递的程序设计技术.pptVIP

*FaultTolerance:PVMVirtualMachineFasthostdeleteorrecoveryfromfault*ConclusionPVMVirtualmachineconceptSimplemessagepassingCommunicationtopologyunspecifiedInteroperateacrosshostarchitectureboundariesPortabilityoverperformanceResourceandprocesscontrolRobustfaulttoleranceMPINosuchabstractionRichmessagesupportSupportlogicalcommunicationtopologiesSomerealizationsdonotinteroperateacrossarchitecturalboundariesPerformanceoverflexibilityPrimarilyconcernedwithmessagingMoresusceptibletofaultsEachAPIhasit’suniquestrengths*ConclusionPVM虚拟机概念简单的信息传递通信拓扑未指定跨主机架构边界互操作可移植性超过性能资源和过程控制强大的容错能力MPI没有这样的抽象丰富的消息支持支持逻辑通信拓扑一些实现在架构边界之间不能互操作性能超过灵活性主要关注消息传递更容易发生故障EachAPIhasit’suniquestrengths*ConclusionPVMisbetterfor:Heterogeneouscluster,resourceandprocesscontrolThesizeofclusterandthetimeofprogram’sexecutionaregreatMPIisbetterfor:Supercomputers(PVMisnotsupported)ApplicationforMPP MaxperformanceApplicationneedsrichmessagesupportEachAPIhasit’suniquestrengths*ConclusionPVMisbetterfor:异构集群，资源和过程控制集群的大小和程序的执行时间很好MPIisbetterfor:超级计算机（不支持PVM）申请MPP最高性能应用需要丰富的消息支持EachAPIhasit’suniquestrengths*谢谢各位！。****WhatdoesMPIgiveustofacilitatewritingparallelprograms.Send/receiveiscooperativeNon-blockingislikeasynchronous.**HowPVMisDesigned*BasicPVMFunctionsEnrollsthecallingprocessintoPVMandgeneratesauniquetaskidentifierifthisprocessisnotalreadyenrolledinPVM.IfthecallingprocessisalreadyenrolledinPVM,thisroutinesimplyreturnstheprocessstid.将调用进程注册到PVM中，并生成唯一的任务标识符，如果此进程尚未注册在PVM中。如果调用进程已经注册在PVM中，这个例程只需返回进程的tid。 tid=pvm_mytid();StartsnewPVMprocesses.Theprogrammercanspecifythemachinearchitectureandmachinenamewhereprocessesaretobespawned.开始新的PVM流程。程序员可以指定要生成进程的机器体系结构和机器名称。numt=pvm_spawn(worker,0,PvmTaskDefault,,1,tids[i]);*BasicPVMFunctio