[CSC 435] Compiling with timing library and atlas

[Andrew J. Pounds]

Okay guys -- I'll get the web page up this weekend, but until then here 
are the compilation directives for your fortran
codes that call my timing library (which you can copy from 
/pub/pounds/CSC335/liblbstime.s) as well as the atlas (tuned BLAS)
library.  The order the libraries are called in is important

Single threaded:

gfortran -fPIC (other optimization options) source.f 
-L/pub/pounds/ATLAS/lib/Nocona -llapack -lcblas -lf77blas -latlas 
liblbstime.a /usr/lib64/libg2c.so.0 -lstdc++

Multi-threaded

gfortran -fPIC (other optimization options) source.f  
-L/pub/pounds/ATLAS/lib/Nocona_Threaded -llapack -lptcblas -lptf77blas 
-latlas  liblbstime.a /usr/lib64/libg2c.so.0 -lpthread -lstdc++

These assume that liblbstime.a is in the same directory as the source code.

One bit of bad news, the number of processors that atlas uses is defined 
at compile time.  Cobra reported 8 -- so it will use 8 processors when 
running in threaded mode.  Some small jobs will use fewer processors 
based on compile time tuning.   So, you can't dynamically change the 
number of threads you use when working with the atlas libraries -- but 
you can with your own codes!

-- 
Andrew J. Pounds, Ph.D.  (pounds at theochem.mercer.edu)
Associate Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627