Re: Including BLAS library.

[Richard Hindmarsh]

Thanks. Actually (at least in CSH) it turns out that all one needs to do is

setenv LD_LIBRARY_PATH=myblasdir

and the configure options are irrelevant - this was mentioned in a 
posting last year.

It turned out my problem stemmed from the fact that I was using the Goto 
BLAS library,
which doesn't contain xerbla, which tripped an error in config and lead 
to the default library being used.
Using LD_LIBRARY_PATH allows one to pick up the Goto library.

More fun (and I suppose people know this) is to

./configure --enable-shared --enable-dl --disable-static LDFLAGS=-lpthread

and set LD_LIBRARY_PATH to a directory containing a multi-threaded e.g 
Goto BLAS.
Then one gets multi-threaded matrix multiplications, unlike some other 
commercial matrix-based
interpreters. Typically, with one processor (Xeon 1.7GHz) I get around 
2.5 Gflops  and 4.2 Gflops
for dual processors for a 1000x1000 matrix multiiplication with the Goto 
libraries.

Richard

John W. Eaton wrote:

> On 17-Mar-2005, address@hidden <address@hidden> wrote:
>
> | I configured with
> | 
> | ./configure
> | --prefix=/local1/data/glacier/rcah/rcah/octavecvs/installdir
> | --enable-shared --enable-dl --disable-static
> | --with-blas=/users/glacier/rcah/rcah/blas/x86/libblas.so
> | 
> | the purpose being to include a particular blas library. However, at
> | end of configure process, I get the following, which makes me
> | suspect I am not picking up the BLAS library I want. Am I doing the
> | --with-blas option correctly?
>
> Probably you just need to do
>
>  ./configure LDFLAGS=-L/users/glacier/rcah/rcah/blas/x86 ... other options ...
>
> though you may also need to need to set some other linker flags or set
> LD_LIBRARY_PATH so that Octave can also find the library at run-time.
>
> jwe
>
>  



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