Work unit order

If it starts another task in High priority mode BOINC "thinks" that this task is in danger of missing the deadline.

It happens if the new downloads have very close deadline ("shorties")
or if you heavy use the computer (e.g. game) - this appears to BOINC as if your computer just become slower.

P.S.
In fact all the decisions and management are done by BOINC client (boinc.exe)
BOINC Manager (boincmgr.exe) is just GUI which you use to monitor and give orders to the BOINC client.
You can also control boinc.exe by boinccmd.exe (Command Line)

You can exit BOINC Manager but keep boinc.exe running and all will be fine -
I do it on my slower computer (on which BOINC Manager uses 5-10% CPU time).
Per 1-2 days I start BOINC Manager (just curious to see the progress) and exit it again.


Look here how to exit BOINC Manager but keep boinc.exe running:
http://setiathome.berkeley.edu/forum_thread.php?id=59781&nowrap=true#992660

Check [v] Stop running science applications when exiting the Manager
to exit boinc.exe

UnCheck [ ] Stop running science applications when exiting the Manager
to keep boinc.exe running


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- ALF - "Find out what you don't do well ..... then don't do it!" :)