AFAIK there is no way to change the execution order unless you manually micro-manage tasks by suspending and resuming each and every work unit.

Wow it took only ten minutes to get two answers to my question. You both are very fast :)

I thought in that way because I could not find any option in my BOINC client.

Actually I do not have any problems receiving tasks with shorter return time, but it would be good to have some savety time by executing the task with the shortest return time first.

I guess this is a boinc topic and I should raise this topic in their forum ?

Gents,

principally there is no need whatsoever to manually intervene in the normal FIFO processing order. Rather often than not it causes more issues than it resolves. Only when you know that a task will take longer than to the deadline i.e. TTC is completely underestimated should such stop start suspend action be undertaken. The adage is though a smallish cache like 1 day, then a long DDDT2 A-Type task gets always started within 24 hours and gets completed within the next 7 days, that is unless the device is really really slow. Generally if WCG notices a device is slow it will even automatically increase the deadline up to 2x normal, but as said unless these are known monster jobs that have wrong completion time predictions, there's no need to MM.

cheers