I have a 1TB disk and try to do a fixed number, say 1000, random 4KB I/O's cross the whole disk. If I use size=4MB, I can only touch the first 4MB range of the disk instead of the whole disk range. If I set size as 1TB, it will do much more than 1000 I/O's and run too long. As for time_based, it is not ideal since I cannot control the I/O number precisely. On Thu, Aug 8, 2013 at 1:54 PM, Jens Axboe <axboe@xxxxxxxxx> wrote: > On 08/07/2013 12:57 PM, Jiahua wrote: >> Sorry to bother you again! Can anyone shed some light here? Or can you >> give a pointer into the code where I should look at to implement the >> feature I want? >> >> Thanks, >> Jiahua >> >> On Tue, Aug 6, 2013 at 4:19 PM, Jiahua <jiahua@xxxxxxxxx> wrote: >>> Hi all, >>> >>> What I want is to touch a file/device randomly but up to a given >>> number of times. I tried the "size=" option but it also limits the >>> file size. Is there a way to do that instead of time_based, which is >>> approximate to my requirement? > > Not sure what you as asking here. size= will generally specify the > region that fio will operate on. If you want to touch it multiple times, > you could do time_based and/or loops. The region will still be governed > by size= (or default to the existing total size of the file/device, if > not given). > > -- > 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
