On 11/24/22 05:38, Mateusz Masiarz wrote: > Hello, I'm trying to benchmark pendrives with fio. I'm running: > fio --name=test --ioengine=posixaio --direct=1 --rw=randwrite --bs=4k > --size=4g --numjobs=1 --iodepth=1 --runtime=60 --group_reporting > --time_based Try ioengine=psync and you can drop iodepth=1 as it is useless. That is equivalent to aio with iodepth=1. You can also try ioengine=libaio (with iodepth >= 1) on Linux. > the io file creates normally, but then the job starts. Firstly, the > write speed is not shown. Secondly, after the job runs for one minute, > the completion percentage drops to 50 and the eta shows a few thousand > days and the job doesn't end. After about 5 minutes of running the job > ends, but write speed is supposedly only a few bytes per second, which > (I think) is wrong, because crystaldisk mark shows around a few > megabytes per second with a similar random write test. I'm running > fio-3.33 and I tested this on MacBook M1, raspberry pi, some old > kubuntu system and on Windows, and every result was similar. > By the way, is it normal for "Laying down IO file" to take a while? -- Damien Le Moal Western Digital Research
