15 January 2007
Lampson: Lazy and Speculative Execution
12
Lazy: Write
Buffers
nIn
memory and file systems
oBe lazy about updating the main store
▬Writeback caching is a variation
nThe
bet: Data is overwritten before it’s flushed
nAlso
win from reduced latency of store
nAlso
win from load balancing of store bandwidth
nRep:
State = main store + write buffer
oSame idea as redo logging, but simpler