Hi,
a possibly dumb question:
If you have a hard partition with 2 cores but 8 threads total but are
running five Oracle instances within that hard partition, does the Oracle
software know that five instances are running from the same home? Or is
each instance oblivious to the fact that it is sharing resources with other
instances.
I ask because if we set cpu_count=8 in each of five instances, doesn't that
mean the instances expect the hard partition to provide a total of 40
threads?
If they are aware of their environment then each instance could say "well
obviously they are lying to me, I only really have 8/5 threads available to
me, though we are sharing resources so sometimes I will have more time
slices, other times, not as many."
Overloading may not cause major problems other than each instance not
getting as many time slices as it expects, i.e. each one would end up
running slower than optimal. (reminds me of when I was a student working
on an overloaded mainframe which had more dumb terminals than recommended,
each dumb terminal had to wait for time slices) Meanwhile there would be
nearly no wasted time slices because the CPUs are very busy.
-- Patrice
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