[slime-devel] Re: Customizing GC messages

[Raymond Toy]

Helmut Eller wrote:
> Raymond Toy <rtoy at earthlink.net> writes:
> 
> 
>>Will lisp::gencgc-stats do what you want?  I don't really know what
>>all of the data mean.  It was meant for someone to use if they needed
>>or wanted to try tuning GC for their app.
> 
> 
> Good enough for me.  I assume that there are always 6 generations.  I
> changed the default gc-hook so that it also prints the time and the
> distribution.  It looks now like:
> 
> [GC done. 11.2 mb freed  84.5 mb retained  0.0/.05/.01/.12/.78/.03  0.07 sec]
>                                            ^^^^^^^^^^^^^^^^^^^^^^^   
>                                            This here is the distribution.
> 
> The newest generation is first and, e.g. .78 means that 78% of the
> live objects are in the 5th generation.

This looks good.  The default is 6 generations, but it's a compile-time 
constant, that's never been changed AFAIK.  It's also possible to change 
the number of "active" generations at run-time so older generations are 
never GCed.  But people doing this should know what they're doing, so 
this default is pretty good.

Rather than using my own version, I just updated slime and this looks 
quite nice.

Many thanks!

Ray