Add Concurrent.usable_processor_count that is cgroups aware #1038
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eregon
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Arf: I'll fix 2.3 compat. |
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Closes: ruby-concurrency#1035 A running gag since the introduction of containerization is software that starts one process per logical or physical core while running inside a container with a restricted CPU quota and totally blowing up memory usage in containerized environments. The proper question to ask is how many CPU cores are usable, not how many the machine has. To do that we have to read the cgroup info from `/sys`. There is two way of doing it depending on the version of cgroups used. Co-Authored-By: usiegl00 <50933431+usiegl00@users.noreply.github.com>
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Closes: #1035
A running gag since the introduction of containerization is software that starts one process per logical or physical core while running inside a container with a restricted CPU quota and totally blowing up memory usage in containerized environments.
The proper question to ask is how many CPU cores are usable, not how many the machine has. To do that we have to read the cgroup info from
/sys. There is two way of doing it depending on the version of cgroups used.Co-Authored-By: @usiegl00