[batch] Use earlyoom to terminate a process using too much memory
#1402
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Linux's built-in system to manage out-of-memory (OOM) errors is unreliable and non-informative, even if it kicks in (and if often it does too late, when the machine is already unresponsive) there's no easy way to tell that a process on a remote machine was terminated because it was using too much memory. With `earlyoom` we bypass Linux's OOM management and have better control over what's printed to screen in case of error.
giordano
commented
Mar 11, 2025
| # Terminate the `earlyoom` process | ||
| kill "${{{{EARLYOOM_PID}}}}" | ||
| # Print line(s) in the log file referencing terminated processes, if any. | ||
| grep "^sending SIGTERM to process" "${{{{EARLYOOM_LOG}}}}" |
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This catches also SIGKILL:
Suggested change
| grep "^sending SIGTERM to process" "${{{{EARLYOOM_LOG}}}}" | |
| grep "^sending \w+ to process" "${{{{EARLYOOM_LOG}}}}" |
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| # Start the `earlyoom` daemon. | ||
| nohup earlyoom -m 95 -s 100 &> "${{{{EARLYOOM_LOG}}}}" & |
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I got the argument -m 5 backward, the argument is the amount of memory available, not used:
Suggested change
| # Start the `earlyoom` daemon. | |
| nohup earlyoom -m 95 -s 100 &> "${{{{EARLYOOM_LOG}}}}" & | |
| # Start the `earlyoom` daemon. Ignore swap usage, terminate process if less than 5% of main memory available. | |
| nohup earlyoom -m 5 -s 100 &> "${{{{EARLYOOM_LOG}}}}" & |
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Linux's built-in system to manage out-of-memory (OOM) errors is unreliable and non-informative, even if it kicks in (and if often it does too late, when the machine is already unresponsive) there's no easy way to tell that a process on a remote machine was terminated because it was using too much memory. With
earlyoomwe bypass Linux's OOM management and have better control over what's printed to screen in case of error.Ref: #1333 (comment).
Note: opening as draft because I haven't tested this in production yet.