Re: [Gcl-devel] Re: [Maxima] Maxima GCL init file update

[Camm Maguire]

Greetings!

"Vadim V. Zhytnikov" <address@hidden> writes:

> Mostly tests with large polynomials - ratsimp, expand, factor.
> On all these tests GCL is slower due to larger percent of GC
> time even with new memory allocation parameters.

OK -- does this mean that *all* of the slowdown can be attributable to
gc?  How do the times when subtracting out gbc compare?

> And I don't think that further allocation parameters
> tweaking could give any serious performance boost
> (only at the cost of large memory allocation which
> is not the thing we want).
> Further enhancement require more intricate
> improvements like (1) generate less garbage as you
> suggested (2) improve GC timing if there is any
> possibility (profiling...).

Have a forthcoming post on this one.  In any case, can you also
compare "the amount of garbage processed" with cmucl, roughly the sum
of the heap sizes at each gbc call, though some calls could wind up
processing only a subset of the heap.  There is a DEBUG C define used
in gbc.c which may help in this analysis.

Take care,

> 
> 
> 
> > Take care,
> > "Vadim V. Zhytnikov" <address@hidden> writes:
> >
> >>Hello!
> >>
> >>I'm about to upload into CVS new maxima-init.lisp.
> >>It affects GCL Maxima only and performs some
> >>GCL memory allocation tuning providing significant
> >>performance boot especially on very complicated
> >>problems (up to factor of 10 and more).
> >>According to my tests with such init file
> >>GCL Maxima is just 1.1 - 2 times
> >>slower than CMUCL Maxima.  New init file works
> >>quite well with Maxima 5.9.0 as well.
> >>
> >>But there is one issue I want to discuss.
> >>Initial GCL Maxima memory footprint is now
> >>about 11-13 Mb.  Partially due to larger
> >>ANSI GCL image partially due to initial
> >>memory preallocation. Is this is OK?
> >>In principle one can reduce initial memory
> >>footprint to 4-7Mb by removing initial
> >>preallocation altogether but this slows Maxima
> >>down by factor of 2 on small and middle
> >>size problems.  Any ideas are greatly
> >>appreciated.
> >>
> >>New maxima-init.lisp:
> >>============================================================
> >>;; Pre-allocating memory and more aggressive allocate growth
> >>;; parameters substantially improves GCL performance
> >>#+gcl
> >>(progn
> >>
> >>   #+gmp (si::set-gmp-allocate-relocatable t)
> >>
> >>   ;; If you really need smaller initial memory footprint
> >>   ;; comment these pre-allocations out
> >>   (si::allocate-relocatable-pages 400 t)
> >>   (si::allocate 'cons      1000 t)
> >>   (si::allocate 'fixnum 100  t)
> >>   (si::allocate 'symbol 200  t)
> >>   (si::allocate 'array     100  t)
> >>   (si::allocate 'string    200  t)
> >>   (si::allocate 'cfun      400  t)
> >>
> >>   ;; It is not recommended to make hole size less than 1000
> >>   (si::set-hole-size 4000)
> >>
> >>   (si::allocate-growth 'cons       1 10000 66 33)
> >>   (si::allocate-growth 'fixnum     1 10000 66 33)
> >>   (si::allocate-growth 'symbol     1 10000 66 33)
> >>   (si::allocate-growth 'package    1 10000 66 33)
> >>   (si::allocate-growth 'array      1 10000 66 33)
> >>   (si::allocate-growth 'string     1 10000 66 33)
> >>   (si::allocate-growth 'cfun       1 10000 66 33)
> >>   (si::allocate-growth 'sfun       1 10000 66 33)
> >>
> >>   (si::allocate-growth 'relocatable  1 10000 66 33)
> >>   ;(si::allocate-growth 'contiguous   1 10000 66 33)
> >>
> >>   )
> >>=====================================================
> >>
> >>
> >> -- 
> >>      Vadim V. Zhytnikov
> >>
> >>       <address@hidden>
> >>      <address@hidden>
> >>
> >>_______________________________________________
> >>Maxima mailing list
> >>address@hidden
> >>http://www.math.utexas.edu/mailman/listinfo/maxima
> >>
> >>
> >>
> >
> 
> 
> -- 
>       Vadim V. Zhytnikov
> 
>        <address@hidden>
>       <address@hidden>
> 
> 
> 
> 

-- 
Camm Maguire                                            address@hidden
==========================================================================
"The earth is but one country, and mankind its citizens."  --  Baha'u'llah