python and ARM memory types
dieter
dieter at handshake.de
Mon Oct 5 03:01:50 EDT 2015
voxner.dev at gmail.com writes:
> ...
> But how do I specify (streaming,write-combining,write-back) memory types in python ? Is there a library that I can use ? I am thinking of programming some fixed memory space (say 0x1000_000 - 0x2000_000) as "WC or WT or streaming" using the OS and then try to use the mmap facility in python.
Python is quite a high level programming language - i.e. lots of things
are out of direct control of the programmer - among others memory management.
I suppose you will need an approach that gives you more control over
memory use - maybe, write your algorithms partially in the "C" programming
language.
You might find "cython" helpful to easily combine Python parts
and "C" parts.
"cython" is a compiler that compiles a source (which can use
a subset of Python and a subset of "C") into a "C" source file
which is then processed like a typical "C" source.
It takes care of a lot of the difficulties at the Python-C interface
and, thus, greatly facilitates combining Python and "C" parts.
> What set of libraries can I use ? Where should I start ? Fixed memories are discouraged so what kind of alternatives I can use ?
Note that modern operating systems virtualize memory. You will need a lot
of tricks to be able to use a specific range of physical memory in
"user level" processes -- but hopefully, you do not need to control
thing of the "physical memory level".
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