On 03/15/2012 02:42 PM, Jens Axboe wrote: > On 03/15/2012 12:19 AM, Dan Ehrenberg wrote: >> This patch adds a new option to fio job files. It is described >> in the HOWTO as follows: >> >> offset_increment=int If this is provided, then the real offset becomes >> the offset + offset_increment * thread_number, where the >> thread number is a counter that starts at 0 and is incremented >> for each job. This option is useful if there are several jobs >> which are intended to operate on a file in parallel in disjoint >> segments, with even spacing between the starting points. > > This looks good. "Fixing" the math situation would be a bit more > involved, though cool if we had support for doing arbitrary math. > > I have applied this, thanks Daniel! OK, thinking about this, td->thread_number starts at _1_ and is incremented for each job. So it doesn't _quite_ do what you describe there, then you'd have to do: + f->file_offset = td->o.start_offset + + (td->thread_number - 1) * td->o.offset_increment; instead. I think that's the more logical setup, and it is also what you described. I'll fix the patch up. -- Jens Axboe -- 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
