Re: [GridSim-developers] Problems with Gridlet cancellation and some questions

[Marcos D. de A. <ma...@cs...>]

Thanks for the prompt reply. I hadn't looked carefully the SpaceShared policy.

Regarding the time zones, the providers having time zones is ok.
However, I still do not understand why all those conversions are
needed since in the end everything is related to the simulation clock.
But never mind that, I will just discard these conversions in my work.

Regards,

Marcos


On 24/09/2007, Anthony Sulistio <an...@cs...> wrote:
>
>
> > It seems that at no point the Gridlet status is changed to CANCELED.
>
> See SpaceShared.java  line 754 or TimeShared.java line 770:
>
> // if a Gridlet is finished upon cancelling, then set it to success
> // instead.
> if (rgl.getRemainingGridletLength() == 0.0) {
>      rgl.setGridletStatus(Gridlet.SUCCESS);
> }
> else {
>      rgl.setGridletStatus(Gridlet.CANCELED);
> }
>
>
> See the output from Example7 of Test Case 8.
> It shows Gridlet #2 has been cancelled.
>
>
> ============= OUTPUT for User_1 ==========
> Gridlet ID    STATUS    Resource ID    Cost
>      2        Canceled        11        435.12199999999984
>      0        Success        7        405.0544
>      1        Success        11        1008.9780000000001
>      3        Success        7        1200.0
>
>
> > why do we need time zones particularly in advance reservations?
> > Therefore, why do we need to convert times
> > between time zones?
>
> the time used by the AR scheduler is the absolute time not relative.
> See ARPolicy.java line 4995:
>
> protected long getCurrentTime() {
>      return initTime_ + (int) (GridSim.clock() * MILLI_SEC);
> }
>
> where initTime_ = Calendar.getInstance().getTimeInMillis()
> when you call GridSim.init() method +/- resource time zone.
>
> See AllocPolicy#init() method line 359:
>
>          // looking at the init simulation time
>          Calendar calendar = GridSim.getSimulationCalendar();
>          long simTime = calendar.getTimeInMillis();
>          int simTimeZone = calendar.getTimeZone().getRawOffset() /
>                            AdvanceReservation.HOUR;
>
>          // then convert into the local resource time
>          initTime_ = AdvanceReservation.convertTimeZone( simTime,
>                             simTimeZone,
>                             resource_.getResourceTimeZone() );
>
>
> When you have entities (resources or users) with different time zones,
> then the time will be different.
>
> regards,
>
> anthony
>


-- 
Marcos Dias de Assuncao
Grid Computing and Distributed Systems (GRIDS) Laboratory
Department of Computer Science and Software Engineering
The University of Melbourne, Australia
Email: ma...@cs...