On 09/26/2014 12:30 PM, Alket Memushaj wrote: > Hi, > > I am playing with the dedupe option and while it works well under > synthetic tests, it doesn't seem to work when replaying a trace. > > My test jobs are simple: > > fio --name=replay --ioengine=libaio --direct=1 --iodepth=32 > --read_iolog=/path/to/trace --dedupe_percentage=80 That should work, as far as I can tell, since we do the buffer fill after the iolog retrieval has filled out an IO unit for us. Can you say more about what doesn't appear to work? > I understand that block sizes would be variable during a trace replay, > but is it possible to specify a base block size and calculate dedupe > based on that for blocks that are multiples of the base size? Ah, that might be the key element here. Yes, the dedupe part might not really work well for multiple write sizes. Nothing that inherently prevents that from working, just didn't add that bit yet. Will do that. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
