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planning to try 64 bit octave with Atlas 3.8
From: |
John W. Eaton |
Subject: |
planning to try 64 bit octave with Atlas 3.8 |
Date: |
Sat, 20 Oct 2007 10:13:41 -0400 |
On 19-Oct-2007, Michael Creel wrote:
| > If you compile with --enable-64, you will see the following message at
| > the end of the configure run:
| >
| > configure: WARNING: You used the EXPERIMENTAL --enable-64 option.
| > configure: WARNING: Are you sure that is what you want to do?
| > configure: WARNING:
| > configure: WARNING: You must ensure that the Fortran compiler generates
| > configure: WARNING: code with 8 byte signed INTEGER values, and that your
| > configure: WARNING: BLAS and LAPACK libraries are compiled to use 8 byte
| > configure: WARNING: signed integers for array indexing.
| >
| > In addition to the library/compiler issues, there are a number of
| > other things that are not comletely implemented. People who are
| > interested in seeing a fully functional 64-bit aware version of Octave
| > are encouraged to contribute.
| >
| > jwe
| > _______________________________________________
| > Help-octave mailing list
| > address@hidden
| > https://www.cae.wisc.edu/mailman/listinfo/help-octave
| >
| >
|
| Anticipating some good performance improvements due to threading on multiple
| cores, I'm planning on trying to make a 64 bit Octave using Atlas 3.8, so
| I'd appreciate any pointers about how to do so before wading in. In addition
| to atlas, what else might I need to self-compile? I'm using Debian. Thanks,
You'll need to compile the Fortran bits in a way that INTEGERs are
8-bytes, which probably means using gfortran -fdefault-integer-8.
Octave doesn't really know about large files, so loading
multi-gigabyte files will probably fail.
The binary file formats are 32-bit, so saving large arrays will
probably cause trouble.
There are probably other things I can't think of at the moment (or
haven't thought of at all; that's why it is still experimental).
jwe
Re: What limits the largest size of matrix?, Jordi GutiƩrrez Hermoso, 2007/10/04