ESP32 memory allocation

PeterR
Posts: 149
Joined: Mon Jun 04, 2018 2:47 pm

ESP32 memory allocation

Postby PeterR » Mon Aug 12, 2019 10:12 am

I have add memory diagnostocs to my application so that I may check for leaks/fragmentation.

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heap_caps_get_info()
and requesting capabilities:

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MALLOC_CAP_8BIT,   MALLOC_CAP_EXEC,   MALLOC_CAP_SPIRAM
I am suprised to see that I have MALLOC_CAP_EXEC 214,660 bytes free.
make -j8 size-components reports that the flash code size is >> 500,000.

What exactly is MALLOC_CAP_EXEC & how is it allocated to my program ?
I guess that MALLOC_CAP_EXEC is SRAM0 (192K), SRAM1(128K) but after cache I would have 256K maximum.
Why then do I have 214K MALLOC_CAP_EXEC free when my program is much larger?

WiFive
Posts: 2546
Joined: Tue Dec 01, 2015 7:35 am

Re: ESP32 memory allocation

Postby WiFive » Mon Aug 12, 2019 9:27 pm

Most of the code is not persistently loaded to IRAM, it executes "in place" through an on-demand cache

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