After learning from you how to inquiry the cpu, and reading better the mpqc
manual, the command
mpqc -messagegrp "<ShmMessageGrp>:(n = 4)" filename.inp | tee filename.out
puts all four processors at work and the acceleration with respect to using
only one cpu is really impressive.
My message is perhaps not inappropriate for this list, because my curiosity is
to ask how the two dual opteron cpu work with calculation software that was
not devised for parallel processes. In fact, unlike with mpqc above,
acceleration of my machine with respect to a simple Athlon for force field
calculations with classical programs is modest indeed. What do the two dual
opteron in this case?