it has come to my attention that we have a bit of a memory bloat issue with eo.
and that has to do with eo at runtime doing things like:
_eo_class_funcs_set()
read it. loop over all ops int he op desc table (array) foir the class then go
MODIFYING the array - setting pointers
op_desc->op = op_id;
+
op_desc->op = api_desc->op;
op_desc->doc = api_desc->doc;
etc.
now here is the rub. across a LOT of classes, we will have 50, 100+ of these
arrays. each one will maybe span 1-2 or maybe 3 pages of ram, this is RW memory
coming from the lib and every single app goes duplicating this then modifying
these pointers to be THE SAME THING in each process.
first problem - the modified bits vs static bits are spread out. thus we may
modify only 1 or 2 ptrs per item in the array, but the whole array spans a fair
bit of memory and thus... we end up modifying multiple pages of memory .. per
library etc. - this adds up quickly. maybe 40-80kb per process. then this
multiples by the number of processes we have using efl. that's costly.
we need to fix/adjust this so it can/is set up at COMPILE TIME with a bunch of
consts. eolian needs to take care of this.
catch - eo allows runtime dynamic overriding of a class. you can literally
generate it and modify it as you please at runtime based on current code paths.
we still would like this to work. so we need to have 2 paths. 1 where we
pre-fill a class at compile-time all cosnt'd out, then to override at runtime -
duplicate to non-const version then modify at will.
the catch here is - to do these fixes will mean breaking eo abi. i'm looking at
it now and i can't see an alternative there.
so first - we need to hold off on calling eo stable. then fix this. this
doesn't stop interfaces work - it just means we have extra to do.
--
------------- Codito, ergo sum - "I code, therefore I am" --------------
The Rasterman (Carsten Haitzler) [email protected]
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