It's driving me crazy, i set all the computing preferences on the projects page to only be 1 core, tried editing the default and making new profile (home) doesn't make a difference. I want to run long projects for climate prediction but I don't want it using up all of my cores and there doesn't seem to be a way to do this with config options.. anybody got any suggestions?

Try the 'On multiprocessors, use at most 100% of the processors' setting instead, set to 50% for a dual core, 25% for a quad, 12.5% for a hex core, etc,
the 'On multiprocessors, use at most 4 processor' is only used if the other setting has been set to Zero.

Or use a app_config.xml with the following in it:

<app_config>
<project_max_concurrent>1</project_max_concurrent>
</app_config>

Application configuration

Claggy

As been pointed out else where, the Wiki says you need Boinc 7.5.1, althrough the <project_max_concurrent> option has been added to the Boinc 7.4 head, so will actually be in Boinc 7.4.9 and later.

Claggy

the Wiki says you need Boinc 7.5.1, althrough the <project_max_concurrent> option has been added to the Boinc 7.4 head, so will actually be in Boinc 7.4.9 and later.

Wiki adjusted.

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Thanks for all the help everyone! for some reason setting the options in app_config caused instant failure in climateprediction for me, and was just plain ignored on primegrid.

But anyway, changing multiprocessor to 0% and adjusting the cores to a specific number was the key for me. I use BAM and I was able to set up a few profiles that did the trick.

I later decided to just have one computer do one project and so on, since some just seem to run better on one system than the other, but it was worth the effort.

Antivirus was causing the error in climateprediction. It get's annoyed at the most random projects at the most random times (Bitdefender by the way). Had it ignore the app and were good to go. AVG seems to be the most compatible with BOINC.

Anyway I did get the app config options to work and am having much success maxing out my gpu's as well.. :)