Speex dev - Feb 2005 - reducing the stack size

hi all,

the stacksize required for encoder and decoder
are 32Kbytes and 16 Kbyes respectively.  i changed
it to 20Kbytess and 8Kbytes and it seems to work.
but need to trim further. can someone point me in
the right direction to further reducing the stack size?
thanks!

cheers,
tk

Hi,

It's probably possible to reduce the stack size if you know what you're
doing. For example the current size is set so that any complexity level
will work. I also add a little to that just to be on the safe side if I
add something. The tool I would recommend if you really want to tune the
size for a particular application is valgrind. It will tell you even if
you overflow by one byte. Electric fence might work too.

I have to admit that this statically allocated stack isn't the cleanest
thing to do, but I found nothing better. I'm open to suggestions on
making it cleaner, though.

	Jean-Marc

Le mardi 15 f?vrier 2005 ? 19:25 +0800, tunkeat a ?crit
:
> hi all,
> 
> the stacksize required for encoder and decoder
> are 32Kbytes and 16 Kbyes respectively.  i changed
> it to 20Kbytess and 8Kbytes and it seems to work.
> but need to trim further. can someone point me in
> the right direction to further reducing the stack size?
> thanks!
> 
> cheers,
> tk
> _______________________________________________
> Speex-dev mailing list
> Speex-dev@xiph.org
> http://lists.xiph.org/mailman/listinfo/speex-dev
> 
-- 
Jean-Marc Valin <Jean-Marc.Valin@USherbrooke.ca>
Universit? de Sherbrooke

tunkeat escreveu:
> hi all,
> 
> the stacksize required for encoder and decoder
> are 32Kbytes and 16 Kbyes respectively.  i changed
> it to 20Kbytess and 8Kbytes and it seems to work.
> but need to trim further. can someone point me in
> the right direction to further reducing the stack size?
> thanks!
I once measured *exactly* how much stack I needed in a vary simple 
maner: Change the stack to a known clean memory area filled with all 
zeros, then see what is left. Of course this was in DOS 16bit, but I 
believe it could be done in many OSes. Then you jusr have to let the 
program run for a secific configuration an shoe stack usage at exit.

I just hope this helps...
Alain