Key ingredients to achieve effective 1/O asyne l0op nact cachinc Impact of I/O latency Typical I/O pattern Source Destination time latency ac mg 6/57 S.Ponce-CERNKey ingredients to achieve effective I/O 6 / 57 S. Ponce - CERN async IOopt struct caching c/c latency async msgQ Impact of I/O latency Typical I/O pattern send a packet to destination wait for ack go to next block Source Destination time sending time efficiency = sending time sending time + ping time