104

PSA: If your Jellyfin is having high memory usage, add MALLOC_TRIM_THRESHOLD_=100000 to environment (lemm.ee)

submitted 1 year ago* (last edited 1 year ago) by American_Jesus@lemm.ee to c/selfhosted@lemmy.world

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Many users reported high memory/RAM usage, some 8GB+.

In my case gone from 1.5GB+ to 400MB or less on Raspberry Pi 4.

Adding MALLOC_TRIM_THRESHOLD_=100000can make a big difference.

With Docker:
Add to your docker-compose.yml and docker compose down && docker compose up -d

...
environment:
  - MALLOC_TRIM_THRESHOLD_=100000
...

With systemd:
Edit /etc/default/jellyfin change the value of MALLOC_TRIM_THRESHOLD_ and restart the service

# Disable glibc dynamic heap adjustment
MALLOC_TRIM_THRESHOLD_=100000

Source: https://github.com/jellyfin/jellyfin/issues/6306#issuecomment-1774093928

Official docker,Debian,Fedora packages already contain MALLOC_TRIM_THRESHOLD_.
Not present on some docker images like linuxserver/jellyfin

Check is container (already) have the variable
docker exec -it jellyfin printenv | grep MALLOC_TRIM_THRESHO LD_

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[-] enemenemu@lemm.ee 17 points 1 year ago

What does it do?

[-] American_Jesus@lemm.ee 23 points 1 year ago

The value of this tunable is the minimum size (in bytes) of the top-most, releasable chunk in an arena that will trigger a system call in order to return memory to the system from that arena.

https://www.gnu.org/software/libc/manual/html_node/Memory-Allocation-Tunables.html

MALLOC_MMAP_THRESHOLD_ is an environment variable that sets the size threshold for using the mmap system call to allocate memory instead of using the heap.

Default: 128 KiB
Behavior:
- If a memory request is ≥ 128 KiB, mmap is used.
- If < 128 KiB, the heap is used.
Purpose:
- Helps manage large memory allocations more efficiently.
- Can be adjusted to optimize performance for specific applications.

this post was submitted on 31 Mar 2025

104 points (92.6% liked)

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