I know there's an option to exclude GPU computing for defined executables, as well as excluding specific GPUs from specific projects, but how about telling BOINC to suspend a specific GPU when a specific program is running (leaving the other active)? I have two GPUs and would like to have the better/main one stop crunching when I'm gaming, but leave the weaker one active.

Is there some config file magic that accomplishes this?

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https://boinc.berkeley.edu/wiki/Client_configuration

<exclude_gpu>
Don't use the given GPU for the given project. If <device_num> is not specified, exclude all GPUs of the given type. <type> is required if your computer has more than one type of GPU; otherwise it can be omitted. <app> specifies the short name of an application (i.e. the <name> element within the <app> element in client_state.xml). If specified, only tasks for that app are excluded. You may include multiple <exclude_gpu> elements. If you change GPU exclusions, you must restart the BOINC client for these changes to take effect. If you want to exclude the GPU use for all projects, look at the <ignore_ati_dev>, <ignore_nvidia_dev> and <ignore_intel_dev> options further down. Requires a client restart.

<exclude_gpu>
   <url>project_URL</url>
   [<device_num>N</device_num>]
   [<type>NVIDIA|ATI|intel_gpu</type>]
   [<app>appname</app>]
</exclude_gpu>

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Well, isn't that referring to a project application, not a program? Unless I'm confusing something here...

What I would like to have BOINC do is this:

there's GPU 0 and GPU 1, both running by default for all projects
I run program_A.exe
GPU 0 is suspended, GPU 1 keeps working, for all projects

I want to be able to be selective about GPUs when it comes to exclusive programs, in a nutshell.

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There's no option for that, other than to switch between two cc_config.xml files where you exclude one GPU before gaming and exit & restart the client.
It's been requested in Github as ticket #1459 but unless a volunteer developer picks this up, it won't be added anytime soon.

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Gotcha.

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