Re: Running fio with offset Increment option

[Jens Axboe <axboe@kernel.dk>]

On 04/28/2012 09:09 PM, Suresh Dhanarajan wrote:
> Hi Jens,
> 
> I verified the offsets by using the write_io_log switch.
> when i use offset increment without patch the offset are incremented
> and not reset to zero after stone wall.
> when i use with patch the offset resets to zero after stone wall.
> I hope you are testing with the patch.
> If it is so this what the behavior iam  also seeing.

I'm puzzled. Did a full test here now, with the patch. Simple job:

[global]
ioengine=null
bs=1k
size=10m
offset_increment=1m
numjobs=2
write_iolog=log

[job1]
rw=read

[job2]
stonewall
rw=read

using both the write_iolog and --debug=io, I verified that job1 has two
files, one starts at 0M the next at 1M. job2 has two files, one starts
at 0M the next at 1M. If I remove the stonewall, job1 has 0M/1M and job
has 2M/3M.

That certainly looks like it's working to me. I think you need to check
and double check that you are indeed using a patched version. And note
that write_iolog will _append_ to an existing log file. Perhaps you are
looking at an earlier entry set?

-- 
Jens Axboe