On 03/10/2014 03:12 PM, Elliott, Robert (Server Storage) wrote:
> Since number_ios is checked in io_u.c account_io_completion() rather than a submission function, fio actually runs the requested number of I/Os plus iodepth - 1.
>
> Example: for a job specifying:
> number_ios=5000
> iodepth=128
>
> the results are:
>    read : io=20000KB, bw=222222KB/s, iops=56966, runt=    90msec
>    IO depths    : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.2%, 16=0.3%, 32=0.6%, >=64=98.8%
>       issued    : total=r=5127/w=0/d=0, short=r=0/w=0/d=0
>
> Should that just be documented as such, or should this logic be moved to submission?
> static void account_io_completion(struct thread_data *td, struct io_u *io_u,
> ...
>          if (td->o.number_ios && !--td->o.number_ios)
>                  td->done = 1;

Can you try the attached patch and see if that makes it behave more like 
expected?

-- 
Jens Axboe