Replacing a $3000/mo Heroku bill with a $55/mo server

Re:Replacing a $3000/mo Heroku bill with a $55/mo server by webstrand on Tuesday October 21, 2025 @11:14PM (#45664550)

I've experimented with no-swap and find the same thing happens. I think the issue is that linux can also evict executable pages (since it can just reload them from disk).

I've had good experience with linux's multi-generation LRU feature, specifically the /sys/kernel/mm/lru_gen/min_ttl_ms feature that triggers OOM-killer when the "working set of the last N ms doesn't fit in memory".

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Re:Replacing a $3000/mo Heroku bill with a $55/mo server by ValdikSS on Wednesday October 22, 2025 @09:06AM (#45668497)

    Enables Multi-Gen LRU (improved page reclaim and caching policy).
    Prevents thrashing, improves loading speeds under low ram conditions.
    Requires kernel 6.1+.
    Has dramatic effect especially on slower HDDs.
    For slower HDDs, consider 1000 instead of 300 for min_ttl_ms.

    sudo tee /etc/tmpfiles.d/mglru.conf <<EOF
    w-      /sys/kernel/mm/lru_gen/enabled          -       -       -       -       y
    w-      /sys/kernel/mm/lru_gen/min_ttl_ms       -       -       -       -       300
    EOF

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