Is there a way to make cc_config.xml understand a more complex time schedule than to work within a single time frame? For example:

Work CPU between 23:01 and 25:59;
Work CPU+GPU between 01:01 and 06:59

Depending on your operating system you'd have to use cron (Linux) or the Windows Task Scheduler to turn these modes on and off using the BOINC command line tool

I presume the Mac would have something similar to cron for scheduling tasks.

As mentioned above you are saying run CPU all the time and between 00:01 and 06:59 allow the GPU. So you'd need a BOINCCMD --set_gpu_mode to toggle between always and never. According to the documentation it also has a duration so you might even be able to simply enable it for a duration of ~ 25200 seconds.

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MarkJ

I'll be using linux, so I'll look into cron.

The two different time slots are based on my cheap electricity schedule. I want to avoid GPU in the first slot, because I'll probably be using the computer at that time. The second slot is where BOINC can use everything.

From 01:01 to 06:59 (second slot) the cost goes back to cheap rate again, and the one minute difference is there to make sure there is no accidental overlap into expensive time.