[Disksim-users] Interfacing disksim synchronously

[Steve Schlosser]

You should be able to use the disksim interface as-is, although it
will preclude you from doing a few things.  Basically your approach
should be to issue a request using disksim_interface_request_arrive()
and then call disksim_interface_internal_event() repeatedly until
disksim calls your completion function.  The time given to the
completion function should be the time that the request finished.

One limitation is that you can only ever have one request
"outstanding" to disksim at a time, meaning that you won't see any
effect from scheduling, overlapping of seek and transfer, etc.  This
may not matter to you.

Also, your simulator's notion of time will be different from disksim's
view of time, since your repeated calls to
disksim_interface_internal_event() will cause disksim's internal time
to advance into the future, relative to your simulator's time.

Good luck.

-steve

On 9/7/07, Diwaker Gupta <diwaker.lists at gmail.com> wrote:
> Hi *,
>
> I'm looking to integrate disksim in a full system simulator. I've read
> through disksim_interface*, the manual etc and everywhere one of the
> requirements listed is that the simulator support asynchronous
> operation -- that is, it should be able to proceed without blocking
> for the disk request to finish, and at some later time disksim would
> deliver the completion notification.
>
> Due to some constraints, I need to interface disksim in a synchronous
> fashion. That is, I'd like to pass in the request to disksim, and I'd
> like disksim to immediately return to me the time it _would_ take to
> finish the request. I can then inject the appropriately delay in the
> external simulator myself.
>
> Can anyone suggest what would be a good way to go about this? Is this
> even doable?
>
> Thanks,
> Diwaker
> --
> http://floatingsun.net/
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