[Help-gsl] ATLAS, SMP, Suse GSL vs. vanilla

[Joe Georger]

I have a couple of questions regarding the use of GSL with ATLAS.  I am 
working on a dual Opteron running Suse 9.3 Pro.  I installed GSL v1.6.5 
from the Suse dvd.  I downloaded and installed ATLAS 3.7.11.  I wrote a 
test code to do a QR decompostion with N=1000.  I compiled with -O2 and 
the following libs:
LDLIBS = -lgsl -lgslcblas -lm

and

LDLIBS = -L/usr/local/ATLAS/lib/Linux_HAMMER64SSE2_2 -lgsl -lptcblas 
-latlas -lm -lpthread

1.)  I get virtually no performance difference with either of the 
above.  The executable size goes way up to like 7 MB with the latter.  I 
have also tried the single-threaded version of ATLAS.
2.)  Only 1 cpu is doing any work.  Is that correct, even though I 
compiled and linked in the threaded versions of ATLAS?

Here is the second issue:  I installed ATLAS on another dual Opteron box 
running SLES9.  SLES9 does not include GSL as part of its distribution 
so I downloaded and installed GSL 1.7 from the website.  Problem is, 
it's about 10x slower than my machine!  I went so far as to copy 
libgsl.so.0.7.0 and link libgsl.so.0 to it instead of 0.8.0, and I got 
my missing factor of 10 back.  Can anyone comment on that?

Thanks,
Joe