[ruby-core:20179] Re: Promising C coding techniques to reduce MRI's memory use

Roger,

I already responded in detail to this bug:

http://rubyforge.org/tracker/?func=detail&atid=1698&aid=7896&group_id=426

I just bang on Ruby 1.6.8 for our robotics application.

You seem to already be doing a lot of excellent Ruby testing with current
versions.
If I spent a couple days developing these two patches for Ruby 1.8.7, 
would you be willing to run
regression tests against them and to report the results here?

I think the small stack clearing patch should improve the GC behavior,
but, by itself, it will likely slow down some apps due to its having
to clear large areas of stack.  I'd expect to see that
slow down mitigated by the larger patch that would refactor rb_eval()
and thereby keep the stack smaller.

The combined patches will likely be large, so I'll just post links to them
here.

Would anyone else be willing to test them? ...
Particularly those who have large apps, and/or apps that use multiple
threads or
continuations that seem to leak memory?

- brent

P.S.  I use gcc 3.4.5 for generating code for our embedded ARM targets.
The older compiler generates fewer stack temporaries than the newer ones.
Don't rush to update :-)

P.P.S.  The way GC is currently invoked causes it to occur when that stack
is already near its maximum depth.  This patch tries to make GC normally
occur is part of CHECK_INTS, when the stack tends to be shallower.
At that point, clearing the stack can be much more effective.



Roger Pack wrote:
> 
> 
> Wow thanks for doing that. I'd say please create a redmine bug for it
> [or attach it to an existing].  A patch to 1.8.7 would be sweet :)
> A patch for 1.9 would be great too :)
> 
> I'd imagine that your system is "better" than just blindly doing a
> garbage_collect()
> {
> clear_stack();
> ....do normal gc
> }
> void clear_stack()
> {
>   a = char[10000];
>   memclear(a);
> }
> ?
> 
> Thanks!
> -=R
> Note that I use gcc 3.4.5 I assume that won't be a problem though.
> 
> 
> 

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