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The bare-bones `debian` distribution we use for testing doesn't have `ps`. This patch switches to reading `/proc` file system directly on Linux instead of relying on `ps`. Performance measurements for the 20000 active processes on Debian Docker container, tested on my M1 Max Mac: - the `ps -eo pid,ppid,pgid` call + parsing takes 293ms - the manual synchronous `/proc` traversal + parsing takes 326ms So this is ~10% perf penalty. Drive-by: rename `pgid` into `pgrp` so that it stands out from `pid` (process ID) and `ppid` (parent process ID).