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Re: [Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures
From: |
Camm Maguire |
Subject: |
Re: [Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures |
Date: |
21 May 2002 23:20:17 -0400 |
Greetings!
Raymond Toy <address@hidden> writes:
> >>>>> "Camm" == Camm Maguire <address@hidden> writes:
>
> Note: I've removed James Amundson and maxima from the CC list since
> this doesn't have anything to do with that anymore. Apologies if they
> wanted to follow!
>
> >> So, if you don't mind having BLAS completely in Lisp, then yes, f2cl
> >> will give that to you. If you really wanted to have an interface from
> >> a precompiled BLAS library to Lisp, then, no, f2cl doesn't really do
> >> that. In principle f2cl could write out the necessary code to a
> >> foreign-function interface that you could use. I haven't actually
> >> done this though.
> >>
> >> If you're interested in connecting Lisp with BLAS and/or LAPACK, you
> >> may want to look at Matlisp (see sourceforge.net). It only supports
> >> ACL and CMUCL right now. Could work with GCL in principle, but GCL
> >> must store (simple-array double-float (*)) just like C would store
> >> double x[n], and you also need to provide some means for getting at
> >> the actual storage.
> >>
>
> Camm> The latter I can do, but I'm unsure about how to ensure the former,
> Camm> epsecially with garbage collecting. Do other lisps avoid splitting
>
> Matlisp takes care to turn off GC before grabbing the array storage
> address. It does what it needs to do, calls the external Fortran
> routine, and then turns GC back on.
>
OK, so it shouldn't matter how the array is allocated as long as it is
contiguous, right?
> Note that having external routines scribble into Lisp's own data
> structures is a great source of hard-to-find bugs that crash your
> Lisp. This was a historical design decision back when CMUCL only had
Why is this?
> about 8 MB of malloc space for external routines. It's much larger
> now, but still quite a bit smaller than the Lisp heap.
>
Well, there could be some good news here for gcl too. there is an
implementation specific option :static to make-array and friends,
which basically specifies that the body is contiguous, and
non-relocateable, to my understanding. So if I implement some
(staticp function and check it on blas/lapack entry, I should be in
business, no?
> Camm> arrays across pages?
>
> What are you going to do with an double-float simple-array of 1 million
> elements? CMUCL certainly has it in one contiguous piece of memory of
> 8 MB or so.
>
> >> I think that's up to you to decide what to bundle with gcl.
> >>
>
> Camm> Wow -- what power! :-) I just thought this might be useful vis-a-vis
> Camm> maxima because one typically does some symbolic work, gets to a
> point
> Camm> where no further progress is possible, and then wants to investigate
> Camm> things numerically, at least in my work. Maybe its better to just
> Camm> copy/paste into octave? Would anyone else find this useful in
> maxima?
>
> I think it's useful. I personally probably wouldn't use it, but I
> don't use maxima everyday for symbolic stuff either.
>
Thanks again,
> Ray
>
>
--
Camm Maguire address@hidden
==========================================================================
"The earth is but one country, and mankind its citizens." -- Baha'u'llah
- [Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures, (continued)
[Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures, Raymond Toy, 2002/05/02
- [Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures, James Amundson, 2002/05/02
- [Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures, Raymond Toy, 2002/05/03
- Re: [Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures, Camm Maguire, 2002/05/21
- Re: [Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures, Raymond Toy, 2002/05/21
- Re: [Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures, Camm Maguire, 2002/05/21
- Re: [Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures, Raymond Toy, 2002/05/21
- Re: [Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures,
Camm Maguire <=
- Re: [Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures, Raymond Toy, 2002/05/21
- Re: [Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures, Richard Fateman, 2002/05/21
- Re: [Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures, Camm Maguire, 2002/05/21
- Re: [Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures, Raymond Toy, 2002/05/21
- Re: [Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures, Camm Maguire, 2002/05/21
- Re: [Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures, Richard Fateman, 2002/05/21
- Re: [Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures, Camm Maguire, 2002/05/21
- Re: [Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures, Camm Maguire, 2002/05/22
Re: [Gcl-devel] Re: [Maxima] Bugs in gcl cause maxima build failures, Camm Maguire, 2002/05/20