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dynamic vs static allocation

Posted by bachadamin on March 31, 2017

Hello guys I just wanna ask you what is better using a dymanic memory allocation or a static one with freertos ?

dynamic vs static allocation

Posted by rtel on March 31, 2017

That completely depends on your application and preference.

Dynamic is much easier to use, minimises the amount of RAM required as memory is only allocated while it is actually required, but also means the maximum required amount of RAM is harder to predict and adds a little (if you are using a FreeRTOS heap implementation) non-determinism and fragmentation risk. In most applications these risks don't exist in practice.

Static requires more coding on the part of the application writer (you have to allocated the objects by declaring variables), is a little more complex as there are additional function parameters, normally creates a higher maximum RAM usage as everything is always allocated whether it is used or not, but is deterministic and the you know if you have enough RAM a link time rather than run time. These last two points being why static is normally preferred in safety critical applications.


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