BOINC: How to limit the quantity of tasks downloaded?

Let's say you have an 8 thread CPU, and you want to download only as much work that can be crunched at a time. Simple enough, change the project resource share to zero, and only 8 single-threaded tasks will download. But now let's say I am using an app_config.xml file to force tasks to multi-thread and use all 8 threads, like you can do on primegrid. Even with a resource share of zero, it will download 8 tasks. Then one will crunch using all 8 threads, and 7 will sit there waiting their turn to run. Is there a way to force BOINC to download only 1 task at a time, in this situation? I though there was a option in the cc_config.xml file that would enforce a maximum number of tasks per project, but I can't find it. Maybe I am remembering it wrong. Any ideas?

Have you tried the command

project_max_concurrent
A limit on the number of running jobs for this project.

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Originally Posted by purplecfh

Have you tried the command

project_max_concurrent
A limit on the number of running jobs for this project.

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That controls the number of tasks running at once, but not the number of tasks downloaded, I think.

There is a maxcoc and a project max coc, it's worth a try at least.

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Setup multiple clients, running 1 project per client and set <ncpus> or % processors to use number of threads you want on each client.

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Originally Posted by scole of TSBT

Setup multiple clients, running 1 project per client and set <ncpus> or % processors to use number of threads you want on each client.

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I think that will still result in the same problem. I am already running only one project per client, just PG. And only one task is running, using all 8 threads. But BOINC insists on downloading 8 tasks, with 7 idle. I want only one task running, using all 8 threads, with no idle tasks.

FWIW, the reason for this is to be the first to return tasks instead of the wingman, so you get the credit if a prime is found. So I want no aging tasks in a queue.

I guess you already have your cache set really low, like .01 days/0 additional?

Try <fetch_minimal_work>1</fetch_minimal_work> in the cc_config.xml. I'd restart the client after setting it.

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Originally Posted by scole of TSBT

I guess you already have your cache set really low, like .01 days/0 additional?

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Resource share is zero.

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Originally Posted by scole of TSBT

Try <fetch_minimal_work>1</fetch_minimal_work> in the cc_config.xml. I'd restart the client after setting it.

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The description for that one is kinda vague.

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<fetch_minimal_work>0|1</fetch_minimal_work>
Fetch one job per device (see --fetch_minimal_work).

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And that points to:

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--fetch_minimal_work
Fetch only 1 job per device (CPU, GPU). Used with --exit_when_idle, the client will process one job per device, then exit.

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I'll give it a try. Thanks for the suggestion.

It looks like fetch_minimal_work is not per physical CPU, but rather CPU thread. So it works the same as project resource zero in this scenario. Dang.