Is it possible to limit the number that run at once? on my machine with 32gb ram it runs 11 at a time maxing out the ram, the issue is though that its not even half using my CPU (5950x) which causes a few cores to run really fast and the heat to jump up causing the fans to spin up.
I don't want to stop doing them but limiting to like 4 at any one time would be great.

BOINC is in control of how many tasks are run at a time. You can control it by limiting RAM available to BOINC. I think you can also set the max_concurrent value in one of the files too.

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BOINC is in control of how many tasks are run at a time. You can control it by limiting RAM available to BOINC. I think you can also set the max_concurrent value in one of the files too.

But that is Rosetta overall, not Python specific.

You can switch Python off but, afaik, you cannot say allow a maximum of 2 Python jobs whilst allowing up to 8 Rosetta jobs.

Is it possible to limit the number that run at once? on my machine with 32gb ram it runs 11 at a time maxing out the ram, the issue is though that it's not even half using my CPU (5950x) which causes a few cores to run really fast and the heat to jump up causing the fans to spin up.
I don't want to stop doing them but limiting to like 4 at any one time would be great.

I'm running a 5800X with 32Gb RAM and the maximum number of VBox64 tasks I can run is 11 as well, but not very reliably.
I slightly reduced the amount of RAM allocated to Boinc so that only 10 run at once and a lot more reliably - far from perfect though.

The other more obvious way is to go into Options/Computing Preferences and on the Computing tab set "Use at most xx% of the CPUs" to 12.5% for 4 cores of your 32.
You may want to try 25% first to see if that's acceptable to you and tweak down from there if necessary

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I play around with app_config.xml and have been able to do some fine tuning.

Try and change the 2 to what you would like to limit it. It will not control

<app_config>
<app> <name> rosetta_python_projects </name> <max_concurrent> 2 </max_concurrent> </app>
</app_config>

Another app_config.xml line I use to control number of active project jobs is the max concurrent line. It may download more but only execute the specified amount. I was surprised that if a WU "starts", the slot is set up and the memory is allocated in Linux.

<project_max_concurrent> 4 </project_max_concurrent>

Is it possible to limit the number that run at once? on my machine with 32gb ram it runs 11 at a time maxing out the ram, the issue is though that its not even half using my CPU (5950x) which causes a few cores to run really fast and the heat to jump up causing the fans to spin up.
I don't want to stop doing them but limiting to like 4 at any one time would be great.