On 2020/04/24 12:11, Damien Le Moal wrote: > On 2020/04/23 23:41, Seena Fallah wrote: >> Hi all. >> >> I'm trying to probe my file system with fio. I don't want to benchmark >> my file system. The only thing I want do is to for example write 100K >> file on a file system and then check how much IO does it take to write >> and the bandwidth and the runtime. >> The main thing I want is to just write that file size and don't bench on that. >> Can anyone help me which ioengine or which args should I use to do this probe? >> >> Thanks. >> > > dd if=/dev/zero of=/path/to/your/file/to/write bs=100K count=i conv=fsync > Oops... Should be: dd if=/dev/zero of=/path/to/your/file/to/write bs=100K count=1 conv=fsync obviously for 100K :) You will get the write bandwidth with this. For knowing how many IOs this take, you will need to trace the kernel IO stack (blktrace). No way to know this exactly from user space, that is, if by "IO" you mean "storage device commands". If by "IO" you mean "system calls", then with the above command, it will be exactly 1 "write()" call (use strace to see it). -- Damien Le Moal Western Digital Research
