RAM usage and the maximum RAM reported during compilation

[krzychb]

Hello everybody,

I would like to clarify what I see when compiling WiFiMulti.ino example sketch using Arduino IDE 1.6.12:

1. When compiling WiFiMulti.ino for ESP32 Dev Module with latest git release of this repository, the following is shown:

   Sketch uses 289,903 bytes (27%) of program storage space. Maximum is 1,044,464 bytes.
   Global variables use 88,144 bytes (76%) of dynamic memory, leaving 26,544 bytes for local variables. Maximum is 114,688 bytes.
   Low memory available, stability problems may occur.
   

2. Compilation of equivalent WiFiMulti.ino for Generic ESP8266 Module with 2.3.0 core provides:

   Sketch uses 228,325 bytes (52%) of program storage space. Maximum is 434,160 bytes.
   Global variables use 32,036 bytes (39%) of dynamic memory, leaving 49,884 bytes for local variables. Maximum is 81,920 bytes.
   

• Why RAM usage for ESP32, for seeming identical sketch, is almost 3x bigger than for ESP8266?
• Why only 114kB maximum RAM is reported for ESP32? I was expecting 520 kB.

Thank you for lunching this repository in parallel to esp-idf!
I am sure this requires a lot of effort to maintain extra branch for Arduino for fledgling ESP32.

Krzysztof

[me-no-dev]

have not really gotten down to properly configure reported sizes ;)

[me-no-dev]

this is mostly fixed ot done as much as it can be done currently. RAM should be properly calculated now

[krzychb]

No more terrifying warnings "Low memory available, stability problems may occur." 😉
Thank you @me-no-dev!