memory allocation ESP32's

kdschlosser commented 2 months ago

Port, board and/or hardware

ESP32-S3 N16R8

MicroPython version

1.23.0

Reproduction

micropython.mem_info(), gc.mem_alloc() and gc.mem_free() are not returning the expected values. I am not 100% sure what is going on. I see in the documentation something about using a split heap but I am not able to locate anywhere in the MicroPython code any of the multi_heap_* functions of the ESP-IDF being used. malloc and other stdlib memory functions are not going to allocate memory or free memory from an esp multi heap.

I don't know if this is a bug or possibly an issue with my understanding of what is going on.... The numbers are not even close to what they should be for having an MCU that has 8mb of external SPIRAM.

Expected behaviour

For the numbers to match up properly.

Observed behaviour

>>> micropython.mem_info()
stack: 736 out of 15360
GC: total: 127936, used: 126336, free: 1600, max new split: 69632
 No. of 1-blocks: 2167, 2-blocks: 365, max blk sz: 282, max free sz: 86

>>> gc.mem_alloc()
55792

>>> gc.mem_free()
93616

Additional Information

No, I've provided everything above.

Code of Conduct

Yes, I agree

vshymanskyy commented 1 month ago

Could not reproduce on TTGO T7S3, which uses the same module:

all works as expected. what I can suggest:

Check the boot log to see if PSRAM was detected (probably it wasn't in your case)
Try the latest MPY preview version
Try both OCTAL SPI and a reqular build
Try using a different board with the same module

I think you should really start posting such questions to https://github.com/orgs/micropython/discussions, the community will help. And if it turns out to be a bug, the discussion can easily be converted to a bug report. Cheers!

vshymanskyy commented 1 month ago

Same on MicroPython v1.23.0 on 2024-06-02; Generic ESP32S3 module with Octal-SPIRAM.

But, if I use the non-OCTAL version of MPY v1.23.0, the PSRAM is not detected and it gives me:

>>> gc.mem_free()
248000

Maybe, that's yours case as well

kdschlosser commented 1 month ago

I just actually got it sorted out last night. It was a matter of the octal spiram,.

micropython / micropython