I am a software developer, and in order to track the start and end of processes, I have my computer set to play different click sounds when the processes start and end. I just started running CPDN and S@H with equal amounts of resources allocated, and for a while, the processes were preempting one another every second or so until both ended up running at the same time on my P4 HT machine. While the preempting occurred, I couldn't make out the start or end of other processes for all the clicking going on.

When I get P@H running on BOINC 4.x as well, this problem will only get worse, as it seems likely that the three executables will be swapping constantly so that two are always running.

I would like to be able to set the time between preemption myself, up to an hour or so between switching.

Preemption only happens at 1 hour intervals. This is the shortest it was deemed usable by the dev team.

It is also normal to have two WUs running on a hyperthreaded machine. If you don't wish this to happen, go to your accounts page and set your preferences to use at most 1 CPU, then update the project(s).

> Preemption only happens at 1 hour intervals. This is the shortest it was
> deemed usable by the dev team.
>
> It is also normal to have two WUs running on a hyperthreaded machine. If you
> don't wish this to happen, go to your accounts page and set your preferences
> to use at most 1 CPU, then update the project(s).
>
When BOINC 4.x is first installed for a few minutes, the WUs seem to swap once every few seconds. After that, they seem to settle down to about an hour.