Which preferences are used by Boinc? I see a set of computing preferences here on the website and also "Boinc Manager Preferences" within the manager. My issue seems no matter how far I ramp down CPU usage SETI application still keeps spiking CPU to 100% as viewed in the task manager.

Thanks In Advance!
Arnold R.

the reason you see that spike is that you are not using those CPU cycles. BOINC/seti backs off when other programs are running. So seeing 100% CPU usage from Seti is common when your CPU is idle

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In a rich man's house there is no place to spit but his face.
Diogenes Of Sinope

Which preferences are used by Boinc? I see a set of computing preferences here on the website and also "Boinc Manager Preferences" within the manager. My issue seems no matter how far I ramp down CPU usage SETI application still keeps spiking CPU to 100% as viewed in the task manager.

Thanks In Advance!
Arnold R.

The Boinc preferences override the web settings.

Boinc is designed to work across several OS so it can't do a smooth throttling of the CPU. This feature is design to reduce heat not to directly reduce the load of BOINC on the CPU.
example: At 90% it uses the CPU free cycles for 9 sec and turn off for 1 sec.

Your account is hidden so I can't tell what OS your using. One program I've seen mentioned on the board is TThrottle. It may be better for what you are trying to do.

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Boinc V7.2.42
Win7 i5 3.33G 4GB, GTX470

I'm running Windows XP Pro in this case on a Dell Dimension 2500 (fairly old machine). If for example I limit CPU usage to 50% I will still see spikes to 100% in the task manager? Its not really a big deal more curiosity then anything else as the machine is only running SETI & my weather program (WUHU), occasionally my son will use it to play a game.

Thanks Again
Arnold R.

I'm running Windows XP Pro in this case on a Dell Dimension 2500 (fairly old machine). If for example I limit CPU usage to 50% I will still see spikes to 100% in the task manager? Its not really a big deal more curiosity then anything else as the machine is only running SETI & my weather program (WUHU), occasionally my son will use it to play a game.

Thanks Again
Arnold R.

At 50%, it will run 100% for 1 second and 0% for 1 second. This helps dramatically with laptop cooling (even 75% CPU usage which would be 3 on and 1 off).

The BOINC polling loop runs once per second, and it is during that polling loop that the decision is made whether to run the computations the following second or not.

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BOINC WIKI

Makes sense, Thank for all the input:-)

Arnold R.