Why does "Elapsed Time" change after a reboot?

[JStateson]

In debugging a problem with the GPUGRID project, I rebooted a boinc 24/7 system and the elapsed time decreased by 1/2 as shown.

before rebooting as suggested from this thread.



after the reboot ---



It seems I had a stuck task and attempted to reboot to clear it.  Why did the elapsed time go from 2d6h to only 12h.  I am using boinc 7.03, maybe that is the problem?

[fred]

It seems I had a stuck task and attempted to reboot to clear it.  Why did the elapsed time go from 2d6h to only 12h.  I am using boinc 7.03, maybe that is the problem?

Probably the Duration Correction Factor.
Look at Project (tab) -> Properties (right mouse).

It's normally around 1.0

And 7.03 may help as well.

[Pepo]

In debugging a problem with the GPUGRID project, I rebooted a boinc 24/7 system and the elapsed time decreased by 1/2 as shown.
[...]
It seems I had a stuck task and attempted to reboot to clear it.  Why did the elapsed time go from 2d6h to only 12h.  I am using boinc 7.03, maybe that is the problem?

In such cases (when you suspect a task got stuck) you should also take a look at the Tasks' checkpoint column. It is possible, that the tasks did not checkpoint for the most of the missing time and it just reverted to the last known stored checkpoint data after rebooting.