# facebookincubator/oomd

A userspace out-of-memory killer

Repository: https://github.com/facebookincubator/oomd
Canonical: https://ross.abutalabs.com/products/oomd
Language: C++
License: GPL-2.0
License Family: copyleft
Last push: 2026-08-24T15:50:50+00:00

## Health v2 (maintenance only)
Score: 67/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 8, longevity 100
- inputs: {"age_days": 2988, "days_push": 9, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2045, forks 163 (observed 2026-08-28T04:06:08.856737+00:00)

## What it is
oomd is a userspace out-of-memory (OOM) killer for Linux systems that leverages PSI and cgroupv2 to monitor memory pressure holistically. It takes corrective action, such as killing offending processes, before a kernel-space OOM occurs, with flexible per-workload policy via a plugin system.

## Use cases
- prevent linux hosts from locking up under memory pressure
- kill processes before the kernel OOM killer triggers
- configure custom memory protection rules per workload
- monitor memory pressure using PSI and cgroupv2
- replace kernel OOM handling with userspace policy

## When to choose
- you run memory-overcommitted Linux servers and suffer long lockups from kernel OOM handling
- you need flexible, per-workload OOM policies in userspace
- your kernel is 4.20+ with PSI and cgroupv2 available

## When to avoid
- you run kernels older than 4.20 without PSI support
- you need an OOM solution for non-Linux platforms
- you want a zero-configuration daemon without policy tuning

## Facets
- artifact type: application
- maturity: stable
- function: monitoring, plugin-system
- domain: operating-systems, monitoring, performance
- platform: cli, self-hosted
- tags: oom-killer, psi, cgroupv2, memory-management, system-daemon, linux

## Member repositories
- facebookincubator/oomd (main) score 67

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:08.856737+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:58:01.404048+00:00, confidence not recorded.
  - readme: https://github.com/facebookincubator/oomd (fetched 2026-08-28T04:06:08.856737+00:00, sha 936d6c29d4da)
- Data as of 2026-08-30T08:39:29.467469+00:00.