Cluster Computing Motivation - SERC

¡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