Memory allocation speed is slow by memory fragmentation on long-run test.

[Sebastian Huber]

On 29/03/2019 08:19, JunBeom Kim wrote:
>
> Dear Sir,
>
> I am still working with my customer using RTEMS based Qt Framework in 
> long time.
>
> My customer are using memory allocation(malloc, realloc, free) with 
> frequency about small size(64, 128, 256, 512, 1024 byte, etc).
>
> When RTEMS application is run in long time(for example: 6 hours), 
> malloc() or realloc() speed is slower due to memory fragmentation.
>
> When I used other RTOS(eg: Nucleus, uC/OS, iTRON, etc) before, there 
> was almost same issue.
>

A first-fit allocator (which is used by RTEMS) is completely useless for 
dynamic memory workloads. It is all right if you only allocate and never 
free.

> I used partition memory management for resolving this.
>
> Is it correct method ?
>

We used TLSF in such situations:

https://github.com/mattconte/tlsf

-- 
Sebastian Huber, embedded brains GmbH

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