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CCL’ers:
Thanks so much for
the quick replies. I have the system
working now. Some who wrote
me asked
questions like, Was I logged in as root?, and did I have the SMP Kernel
loaded? Also some
thought
that LINDA was needed to run 2 processors on a “parallel” job. This is not the case
however. The answer was
simply to balance the “bytes” read into shmmax with the %mem= line
in the input file. So for my 512 Mb
total memory and 2 processors, the suggestion was to put 2/3 of available
memory as shared memory. So 340 Mb
is
356515840 bytes. This is done
with
echo “356515840”
>/proc/sys/kernel/shmmax. I ran a test job
of
an OPT on the N1-H deprotonated cytosine cation with B3LYP/6-31+G(d) which took
3 hours and 18 minutes with a single processor and 1 hour 51 minutes with
%Nproc=2.
That’s 1.78 times faster. I thank everyone
who
help out with this. Regards, Dave
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