Sander @ August 25 at 11:49 am

RAM Usage Nerdery

I've been wondering how much RAM I used on my 32GB Ubuntu derivative workstation, mainly used for web development using docker containers and light vm experimentation. Yes when I spotcheck with htop I have enough RAM free, but do I actually need 32GB, when I'm in the market for a new device or an upgrade?

It turns out, yes I do ideally.

The setup

On startup I've been running this script to save the memory stats into a csv file:

#!/usr/bin/env bash
while true
  do free  | grep Mem | tr --squeeze-repeats ' ' ',' | tee --append ~/memory.csv
  sleep 10

Today (after 15 days) I pulled the stats into a database and browsed it:

sqlite-utils insert /tmp/mem.db memory-stats memory.csv --csv
datasette /tmp/mem.db

Sorting by the available column shows that the lowest value I get is 11.9GB available to be freed.

The available column is the sum of the Free column plus the portions of the Buffers and Cache columns (or the Buff/cache column) that can be relinquished immediately. The Available column is an estimate, not an exact figure.

I think it's a reasonable measure. This system does not have zram memory compression enabled, that would help probably.

It has 4GB swap, I did not measure it's usage.

Hopefully this review helps for people who want to measure their own usage.


Related posts

  • June 14 at 1:18 pm energy saving #linux style: $ sudo cronta…
  • March 13 at 12:37 pm Tried 1Password for SSH keys and Git manag…
  • January 10 at 9:07 am I've updated my one stop system update scr…
  • August 25 at 11:49 am RAM Usage Nerdery…
  • April 4, 2023 at 1:55 pm Map Eject to Multitasking View…