Is it possible to run a singular task on all of your CPU's cores and threads? I want to try this mostly for fun. Also does anyone know how the Rosetta computation works, I would love to know.

You might find some information about how Rosetta works at RosettaCommons.

I don’t know of any way to change tasks’ threading or scheduling behaviour. Rosetta’s (and/or BOINC’s) load distribution scheme may well be fundamentally based on running multiple instances of single-threaded applications.

Is it possible to run a singular task on all of your CPU's cores and threads?

No, and there would be no performance benefit in doing so compared to running multiple different Tasks on each core/thread.
However that is how applications that run on GPUs work, and make them so fast compared to CPUs for work that is able to be processed that way.

eg- In Seti at home a high end CPU with a heavily optimised AVX application would take 45min to process a particular Work Unit. On a high end GPU with a very highly optimised application it would take 30 seconds to process the same task. That's roughly 90 times faster.

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Grant
Darwin NT