Why so little memory on board with ESP32

[espruino-discuss3]

Posted at 2023-07-06 by Nicktonious

Hello everyone. I'm using ESP32 Wroom 32 devkit. It is advertised as having

• Flash-memory: 448 Кb
• SRAM-memory: 520 Kb
  BUT as I use process.memory(), I get quite confusing answer:
  Total of 2351 block * 14 bytes (blocksize) results in ~33Kbytes what is extremly low.
  Even if I made a mistake in calculations, I have seen with my own eyes how quickly I lose 2/3 of memory total memory after just a few requires(btw all files are minified) and launching a ws server with 2-3 connections.
  How do u think, can it be a problem with the firmware or Wifi + BLE modules take soo much memory?

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[espruino-discuss3]

Posted at 2023-07-07 by JumJum

Based on my experience, ESP32 eats memory, RAM and Flash, like crazy.
This became more and more with each new version of ESP-IDF
If you need to have WIFI and BLE, I would recommend ESP32 with additional memory

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Posted at 2023-07-07 by Nicktonious

Am I correct that exatly support of BLE & Wifi eats most of the memory?

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Posted at 2023-07-13 by Nicktonious

@jumjum, hello again. I continued to search for answers, even have found ur 5 year old thread on esp32, where you state that:

• ESP32.enableBLE(false/true) , adds about 1900 additional JsVars
• ESP32.enableWifi/false/true) , adds about 3800 additional JsVars

And I see that lots of people are talking about switching BLE off to get more free memory. But even 2500 jsVars is only ~35Kbytes, meanwhile my board advertises to have around more than 500 KBytes of ram. That's just nonsense!

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Posted at 2023-07-19 by JumJum

I agree, ESP32 with ESP-IDF eats memory like crazy.