test(process): attribute session spawn overhead (#366) - #383
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…:process::Command Attributes #366: a bare session tracks std; kill_when_owner_dies and a best-effort priority each add sub-millisecond-to-millisecond cost because the substrate installs them in pre_exec (fork+exec instead of posix_spawn).
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Adds an ignored measurement (
tests/process/session_spawn_cost.rs, a module of the existing process category) comparing a session spawn tostd::process::Commandper option.Finding: a bare session is within ~0.2 ms of std;
kill_when_owner_diesand best-effort priority each add ~0.4-0.8 ms because the substrate installs them inpre_exec(fork+exec instead of posix_spawn). Admission is free. The fix belongs in running-process: zackees/running-process#1248.Refs #366 (left open until running-process lands the fix and zccache re-measures).