Andrey, > You might want to specify iosize or use a time-based run. Could you explain the difference between bs and iosize? My understanding is bs option specifies the iosize. Do you mean I need to add "--size=32M"? time-based won't help in my case because I want to see the runtime of 32MB writes consumed. - Akira On 9/24/14 6:10 PM, Andrey Kuzmin wrote: > You might want to specify iosize or use a time-based run. > > Regards, > Andrey > > On Sep 24, 2014 12:35 PM, "Akira Hayakawa" <ruby.wktk@xxxxxxxxx <mailto:ruby.wktk@xxxxxxxxx>> wrote: >> >> Thanks Andrey, >> >> However, I don't think I still have a problem. >> >> I modified the command >> >> From: >> >> fio --name=test --filename=#{dev.path} --rw=write --ioengine=libaio --direct=1 --io_limit=32M --size=100% --ba=4k --bs=512 >> To: >> fio --name=test --filename=#{dev.path} --rw=write:4k --ioengine=libaio --direct=1 --io_limit=32M --bs=512 >> >> The result is the runtime is too short. >> I guess fio stops as soon as it reaches the end of the device. >> However, I want it to repeat over and over again until io_limit is fully consumed. >> >> Note that the device is smaller than 32M (it is only 508B). >> So, it should repeat more than 60 times. >> >> How can I repeat the workload? >> >> Or, >> >> Building hand-made random map would suffice, I guess. >> >> - Akira >> >> >> On 9/23/14 11:05 PM, Andrey Kuzmin wrote: >> > Offset modifier under rw= should do the trick, consult >> > https://github.com/axboe/fio/blob/master/HOWTO for details. >> > >> > Best regards, >> > Andrey >> > Regards, >> > Andrey >> > >> > >> > On Tue, Sep 23, 2014 at 5:47 PM, Akira Hayakawa <ruby.wktk@xxxxxxxxx <mailto:ruby.wktk@xxxxxxxxx>> wrote: >> >> Hi, >> >> >> >> I want to perform stride write access to a block device but >> >> I don't have a clue how I can do that. >> >> >> >> What I want to do is to perform a stride access that >> >> each write size is 1 sector and 7 sectors are apart between each writes. >> >> (i.e. Only the first sector of each 4KB block) >> >> >> >> For example, >> >> 0, 8, 16, 24, 32, ... >> >> >> >> And, it repeat over the device until certain amount of writes are accomplished. >> >> In my case, amount of 32MB to 508KB device. >> >> >> >> I consider the command below works like as I want but it doesn't actually. >> >> Instead, it looks performing ordinary 512KB seq write. >> >> fio --name=test --filename=#{dev.path} --rw=write --ioengine=libaio --direct=1 --io_limit=32M --size=100% --ba=4k --bs=512 >> >> >> >> My questions are: >> >> 1) How to perform stride write access in fio? >> >> 2) If fio is not a appropriate tool for this purpose, easy to fix? >> >> Or do you recommend other tool? >> >> >> >> - Akira >> >> -- >> >> To unsubscribe from this list: send the line "unsubscribe fio" in >> >> the body of a message to majordomo@xxxxxxxxxxxxxxx <mailto:majordomo@xxxxxxxxxxxxxxx> >> >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > -- 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
