Dear Prof. Troyer,
thank you for your answer. Now, I have configured ALPS using the - with-compiler=macos option. The error message has disappeared, however, the low performance of the linear algebra related routines (in particular dmrg) still remains. The brand-new APPLE is still four to five times slower than my two-years old laptop. The recompilation of ATLAS and LAPACK on the APPLE had no effect on this issue.
Do you have any idea what else I could try?
Many thanks and with kind regards,
Dirk Schuricht
On 11 Jun 2007, at 19:38, Matthias Troyer wrote:
Do you configure ALPS using the --with-compiler=macos option?
Matthias Troyer
On 11 Jun 2007, at 15:36, Dirk Schuricht wrote:
Dear all,
I have a new APPLE with Intel Core 2 Duo Processor which shows very poor performance with all ALPS Applications requiring linear algebra like fulldiag and dmrg. I have already tried to install the ATLAS and LAPACK routines, which had no effect.
When installing ALPS and ALPS applications I get the following error message:
i686-apple-darwin8-g++-4.0.1: unrecognized option '-pthread'
It seems that the pthreads are not working with the standard c- compiler on my system.
Is it possible that this causes the poor performance? And if so, what can I do to overcome this problem?
Many thanks,
Dirk