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py/gc: Support multiple heaps.#3533

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py/gc: Support multiple heaps.#3533
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@aykevl aykevl commented Jan 2, 2018

Enable the addition of heap space at runtime. Advantages:

  • The ESP32 has a fragmented heap so to use all of it the heap must be split.
  • Support a dynamic heap while running on an OS, adding more heap when necessary.

With this code, I managed to extend the MicroPython heap to ~200kB on the ESP32:

MicroPython v1.9.3-239-gd16caf776-dirty on 2018-01-02; ESP32 module with ESP32
Type "help()" for more information.
>>> import micropython
>>> micropython.mem_info(True)
stack: 752 out of 15360
GC: total: 206976, used: 5200, free: 201776
 No. of 1-blocks: 30, 2-blocks: 7, max blk sz: 264, max free sz: 6936
GC area #0 (size 96000), from 3ffb30a0:
00000: h=AhhBMh=DhhhDBBBBAhh===h===Ahh==h==============================
00400: ================================================================
00800: ================================================================
00c00: ================================================================
01000: =========================================h==Bh=ShShhThAh=h=Bh==B
01400: ..h.h=......h=..................................................
       (87 lines all free)
17400: ................................................
GC area #1 (size 110976), from 3ffe4de0:
       (108 lines all free)
1b000: ........................
>>> import gc
>>> gc.mem_free()
201616
>>>

There appears no way to have one large heap on the ESP32, as the ESP-IDF itself fragments the heap:

I (344) heap_init: Initializing. RAM available for dynamic allocation:
I (347) heap_init: At 3FFAE6E0 len 00001920 (6 KiB): DRAM
I (353) heap_init: At 3FFDCE50 len 000031B0 (12 KiB): DRAM
I (360) heap_init: At 3FFE0440 len 00003BC0 (14 KiB): D/IRAM
I (366) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM
I (372) heap_init: At 4008FC7C len 00010384 (64 KiB): IRAM

I haven't included the code for the ESP32 yet, but it is very simple.

I have tested these changes using #3532 and haven't seen a regression.

stinos
stinos reviewed Jan 2, 2018
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@stinos stinos Jan 2, 2018

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There's one semicolon too much

@aykevl
py/gc: Support multiple heaps.
f7376ab 
Enable the addition of heap space at runtime. Advantages:
  - The ESP32 has a fragmented heap so to use all of it the heap must be
    split.
  - Support a dynamic heap while running on an OS, adding more heap when
    necessary.
@aykevl aykevl mentioned this pull request Jan 24, 2018
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aykevl commented Jan 24, 2018

Replaced by a better PR that supports disabling of multiheap support: #3580.

@aykevl aykevl closed this Jan 24, 2018
@dpgeorge dpgeorge added the py-core Relates to py/ directory in source label Jul 22, 2022
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