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From: amado.alves@gmail.com
Newsgroups: comp.lang.ada
Subject: Re: Larger matrices
Date: Wed, 6 Aug 2008 11:40:09 -0700 (PDT)
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Date: 2008-08-06T11:40:09-07:00
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> IMO, for such huge matrices and vectors, it is better to use in-place
> operations, rather than a loose functional programming style.

You mean a procedure with out parameter instead of function? Is there
such utility?

> And do you have dense 5000 x 5000 matrices? You are a hardworking man!

It's an hypertext. It starts out sparse, but then gets less sparse
with the usage because it is an adaptive hypertext system and I am
using spreading activation to create new links. Probably it will never
be very dense, but new links may appear anywhere in the matrix. And
it's only a prototype for a thesis, and the focus is on the
theoretical model not the implementation, so I was prepared to spend a
few megas of my giga ram to use the standard library if only the
compiler let me do it...

I found switches -fstack-usage and -fcallgraph-ifo (gcc) in the GNAT
manual but Gnatmake does not seem to accept this.

I also found that GNAT is calling a BLAS or LAPACK function called
"gemv" to implement matrix-vector "*" and so my diagnostics of
overflow caused by (value?) passing on the stack is probably right.

So now I want to increase the stack size. To 200M. The right Gnatmake
switch, please...