This discussion is one I always find annoying. There are two migs parked
within 5 miles
of my house. I know that they are faster than the 747 i take to germany, i see
them fly
every 4th of july, they are fast. but also, i know they won't make it across
the
atlantic, and they don't carry so many people. Just because a single
application on a
server is faster if configured one way or t'other JUST DOES NOT MATTER. what
matters is
how many people arrive within the service level they were promised. yes,
domino, oracle,
and possibly WAS runs marginally faster if configured differently - but that
means the 747
carries less people or the mainframe supports less applications (or you buy
MORE IFLS).
And the big plane (747, etc) can actually go faster than it does, but it
requires more
fuel to get there. BUT it's an option. (Talk to the 747 pilots that race from
europe to
dulles every morning to get thru customs first, the 777s don't have a chance).
So, what is the real requirement, carry lots of people a long ways, or to get
one person
there really really fast? We're the 747, that by the way, I flew one in 1967
before VM
was an option, so old technology still wins. Did the last really really good
idea come
from the 60's?
And similar, do we want a z9 supporting one server, or do we want it supporting
100?
Same as a 747 - it don't make money carrying one politician or 100 passengers.
It only
makes money when it's 80% utilized. (or 70% if they got the fuel option).
So point is, sure you can configure an application to go faster, recognizing
the cost of
that option can change minds. Many installations have shown that if you reduce
the number
of virtual CP's, the CPU cost goes down, and total thruput goes up. YMWV
Jim Elliott wrote:
Jim, I find your "(like most products, including databases)
runs better on more than one processor" and would be very
interested to see the data supporting this claim. I trust this
would not be from an artificial lab environment with only one
virtual machine and an infinite number of real IFLs installed.
Rob:
For the most part my view is from observation, not actual
studies. And as Mark pointed out, we are talking about two REAL
processors here with a Virtual 2-way running on it. IBM
recommends that you always run Domino on a 2-way (or greater).
There are several places where you can get into a bottle-neck on
a 1-way. I have also seen this at one customer with Oracle where
the performance on a 2-way was dramatically better than on a
1-way (even though the total CPU utilization was about the same).
And from observation, I have seen this at other customers as
well. With all the threads running in "modern" applications these
days, using 2 or more processors seems to improve overall
performance.
Jim
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note:If you can't measure it, I'm just not interested
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