Cluster Computing Motivation - SERC

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¡System¡Buffer¡MemoryOverheads in comm s/wcall overhead¡InterruptsmanagementcopyCPUMEMUserKernelApplLibMsg layerDevice DrvApplBuffKernelBuffH/WOne -CopyZero-CopyNICU-Net (User-level n/w)¡Objectives– Achieve Latency and Bandwidth close to thatprovided by h/w (link level)– Support parallel jobs (with protection)– Flexible enough for upper layer protocols¡How?Eg.: synchronous v/s asynchronous– Avoid kernel from the critical path of send/recv– Use virtual memory hardware for protection– Provide a simple and efficient interface forapplications for network access4
¡Sending¡Receiving¡WaitU-Net (Idea and Design)U-Net (send/recv)Message– Assemble message in the comm segment– Place a queue entry (descriptor) on to send queueMessage– Get the descriptor form the recv queue– Consume message from comm segment– Place the descriptor into free queueMessage– Poll recv queue (select() or signal() )5
Page 1 and 2: ¡Parallel¡Parallel¡CostCluster C
Page 3: ¡Communication¡Communication¡Bet
Page 7 and 8: U-Net (Implementaion)NIC with proce
Page 9 and 10: Cluster based web server (LARD)Clus
Page 11: ReferenceS.L.Scott. Syncronization

Cluster Computing Motivation - SERC

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