Reducing Overhead of MEM_alloc

David Messersmith

I have an application where there is a need to dynamically allocate memory but not a need to free that memory. Is there a way in DSP/BIOS to eliminate much of the overhead (in RAM usage and execution time) in MEM_alloc in this situation?

This is a C28x application using an older version of the compiler and DSP/BIOS but updating to newer tools is OK.

Thanks,

Dave

over 12 years ago

0 Alan DeMars over 12 years ago

TI__Mastermind 30830 points

David,

Currently there is no configurable option that would trim the DSP/BIOS MEM_alloc() API to reduce its execution time.

The SYS/BIOS product supports various types of Heap managers, some of which (such as HeapBuf or HeapMultiBuf) are generally more efficient in their 'alloc' implementations.

Alan

0 David Messersmith over 12 years ago in reply to Alan DeMars

Prodigy 30 points

Alan,

Thanks, I think "heap min" is the one I am looking for. How do I change the heap manager that DSP/BIOS is using?

Thanks,

Dave

0 Alan DeMars over 12 years ago in reply to David Messersmith

TI__Mastermind 30830 points

Add this to your config file:

var HeapMin = xdc.useModule('xdc.runtime.HeapMin', true);
var heapMinParams = new HeapMin.Params;
heapMinParams.size = xxxx; <----- your heap size here
var heap0 = HeapMin.create(heapMinParams);
Memory.defaultHeapInstance = heap0;

This will create a HeapMin of size xxxx. All BIOS ZZZ_create() calls will use this heap.

Alan