We have a cluster managed by SGE. Specifically, this is the version from the
rpm sge-V62u4-1 installed on a Linux cluster running Rocks.
We want to start charging users for use of the cluster. Our plan is to charge
by the core hour. In other words, using one CPU core for 12 hours should cost
the same as using 12 CPU cores for 1 hour.
I think I should be able to gather this information using qacct. For example,
if I understand correctly,
qacct -o -d 30
should output usage for each user over the last 30 days.
However, I am still unclear (after having read the man page and some web sites)
on the interpretation of the various columns of output from qacct (especially
WALLCLOCK, UTIME, STIME, and CPU). Sometimes the value in the WALLCLOCK column
is greater than that in the CPU column and sometimes it is the other way
around. Also, sometimes the CPU column is the sum of UTIME + STIME, but
sometimes it is quite different.
I want to make sure we get this right in the face of parallelism. SGE has
multiple ways to run jobs in parallel (e.g., qmake, array jobs, and parallel
environments).
What is the most reliable way to track core-hours, such that occupying 100
cores for a day costs 100 times as much as occupying just 1 core for a day?
Any advice would be greatly appreciated.
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