Summary:
Also update error handling in NSandbox initialization to avoid node
exiting when sandbox can't be created.
Info on oom_score and choom: https://man7.org/linux/man-pages/man1/choom.1.html
Empirically, in docker and under fargate, oom_score (visible in
/proc/PID/oom_score) seems to be calculated approximately as
((ProcessRSS / TotalMemory * 1000 + 999 + oom_score_adj) * 2/3)
though this doesn't correspond to any documentation I could find.
In addition, under docker / fargate it does not work to set oom_score_adj (with choom or via /proc/PID/oom_score_adj) to a negative value to give priority to a node process. That's why this diff adjust the score up for sandbox processes instead.
Test Plan:
Checked that grist-omnibus built with this change respects the
variable, and sandbox processes end up with higher oom_score values.
Reviewers: paulfitz
Reviewed By: paulfitz
Subscribers: paulfitz
Differential Revision: https://phab.getgrist.com/D4112
2eec48b685