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R is single-threaded.
For example, if I have two R opened running projects. I would expect that there are 2 threads running R with some % of CPU for each thread. Then I open another R. How to use the third R to check the number of threads (2 in this case) and percentage of CPU being used by R?
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Your best bet is to use task manager (windows) or something like top or htop (linux) to see what each core is doing, remembering that R is single-threaded by default. There are math libraries that R might use that take advantage of multiple threads, but R doesn't report on that, only the OS does.
Press Ctrl + Shift + Esc to open Task Manager. Select the Performance tab to see how many cores and logical processors your PC has.
As mentioned in the previous section, R only uses one core at the time, even if there are more available.
The operating system will indeed always assign a different core to each new R instance.
If you open multiple R windows, each window will be running on a different core up to the maximum number of cores that you have. This is automatically implemented on windows and mac computers. If you want to know how many cores you have, you can run:
library(parallel)
detectCores()
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