ESP32 Forum

I recently get OOM issue,

heap_caps_get_free_size(MALLOC_CAP_DEFAULT) returns 112

heap_caps_get_free_size(MALLOC_CAP_INTERNAL) returns 70284

I want to use the MALLOC_CAP_INTERNAL ,

but ,

heap_caps_malloc(size, MALLOC_CAP_DEFAULT) return 0
malloc(size) return 0
heap_caps_malloc(size, MALLOC_CAP_8BIT) return 0
heap_caps_malloc(size, MALLOC_CAP_INTERNAL|MALLOC_CAP_8BIT) return 0
heap_caps_malloc(size, MALLOC_CAP_DMA) return 0
heap_caps_malloc(size, MALLOC_CAP_INTERNAL|MALLOC_CAP_DMA) return 0

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heap_caps_malloc(size, MALLOC_CAP_INTERNAL) return OK

but the memory caused

Guru Meditation Error: Core 1 panic'ed (LoadStoreError). Exception was unhandled.

----

I don't know why it reserved 70K MALLOC_CAP_INTERNAL ,

Is there any config settings that can reduce the size of MALLOC_CAP_INTERNAL ?


Thanks.

Not all memory is MALLOC_CAP_DMA and MALLOC_CAP_8BIT, so it isn't "reserved" but it can't do those things.

Thanks.

Now I know that's the IRAM and it's not able to work as the DRAM

Regards,
Terry

Just share 2 ideas

1 - set all int32,int64,pointer to IRAM_ATTR

staic IRAM_ATTR int intval=0;
staic IRAM_ATTR void* ptrval=NULL;

2 - use custom allocator for std::vector<int> , etc

ptr=heap_caps_malloc(size, MALLOC_CAP_32BIT);
return ptr!=NULL?ptr:malloc(size);

Regards,
Terry