Usage time is tallied only for use of compute machines accessed through the Velocity
Scheduler (vsched). Time on the login machines or the collaboratory
machines is not debited from your allocation.
All machines types are debited the same flat wall-clock rate.
even though the number of processors on a machine varies between
one and two. If you can parallelize your application, you can get two processors
for the price of one.
Wall-clock hours, not compute time, are used to calculate charging.
This means your allocation will be depleted by the amount of time you have compute
machines reserved for your use, not for the time you are actually using them. If
a batch job finishes two hours early but is not returned to the pool by using
vsched -c you will be debited for the
time.
