[kbolino]

What people want is that, if cgroup limits prevent a container from using more than M/N of CPU time (N the number of cores), then GOMAXPROCS defaults to M. Ditto other managed language runtimes and their equivalent parameters.

However, as far as I can tell, there's no clear way to figure out what M is, in the general case.

[lcof]

Again, I might be wrong as I did not use this directly in a couple years, but saying “the limit is 50% share of 10 cores” is not equivalent to “the limit is 5 cores”. This is still “how much” versus “how many”, and cannot translate into each other without sacrificing flexibility

[kbolino]

GOMAXPROCS sets the number of live system threads used to run goroutines. The distinction between 50% of time on 10 cores and 100% of time on 5 cores doesn't really matter here: the recommendation is to set GOMAXPROCS=5 in both cases.