RPi4-8GB never uses more that 2GB

Installation
1

I have HA for 3+ years. I use an external SSD driver instead of SD-CARD. I replaced my RPi4-2GB because it was overheating and rebooting. I replaced it with an RPi4-8GB. Working perfectly and a lot cooler… however, I have noticed that HA never exceeds 2 GB… as it gets close to 2GB RAM usage, the CPU utilisation shoots up to 100%. What is going on? Swapping? How can I determine why this is happening. The HA image (from Pi Imager) is recent, from this March 2024, 64bit, Bookworm.

I notice this high utilisation especially during ESPHome firmware updates (I have 34 devices).

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2

Did you do a fresh install, or restored a backup?

3

fresh install :slight_smile:

4

This is normal, as the processor is doing the compiling. While it definitely uses some RAM, it’s primarily a CPU intensive thing.

5

Not buying that per se… I should, at least, see times where an 8GB RPI4 exceeds memory usage of 2GB…

6

I’m just talking about ESPHome compiles, they don’t require much RAM but ALL the CPU cycles.

You may very well have another issue, but during compiling you shouldn’t have much of a jump in RAM usage.

7

understood. thanks.

8

I looking at this and seeing absolutely zero problems except you have more ram than necessary at the moment. The cpu pegged and memory spiked about 33% utilized when you ran the compiles but other than that. Nothing to see here. You have some room to run a few addons.

The machine is going to use the ram it needs - if it doesn’t need more it won’t take it. HA with no addons I would expect that profile.

Also a ram or CPU profile mostly used is not a problem either. It just means you’re getting utility out of your money.

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