If you get a z/890 or the new z smaller machine, you can get from 1 to 4
processers at one of many different speed settings. I can't remember the
exact MIPS rating, but I think the new z is getting close to 400 MIPS, so
you can get 1 processor with almost 400 MIPS, or 2 or 3 or 4 with a total
that is close to 400 MIPS.
I know that when I worked at P&H Mining, we went from a MP2003 with 3
processors to a MP3000 with 1 processor. Both had approximately 115 MIPS.
One day a month, they had a CICS transaction that I think had something to
do with pricing. Transactions would be streamed to the CICS in batches of
1,000, and the process would run all day. On the MP3000, it would take 100%
of the CPU if you let it, with I/O rates of less than 1 per second. All
batch would stop, until I finally figured out how to set up a performance
group that limited that CICS to 40% of the CPU. Then people still
complained that their batch ran forever, but it did complete eventually.
When we had the MP2003 with 3 processors, we never had that problem.
Eric Bielefeld
Sr. z/OS Systems Programmer
Milwaukee Wisconsin
414-475-7434
----- Original Message -----
From: "Shmuel Metz (Seymour J.)" <[EMAIL PROTECTED]>
In
<[EMAIL PROTECTED]>,
on 10/10/2006
at 05:20 PM, "Ward, Mike S" <[EMAIL PROTECTED]> said:
The thing that gets me is the MIPS. You can go from a machine that
has a single processor at 100 mips. To a processor that has 4 cpus
at 100 mips each and they call it 400 mips. Depending on you
workload type that may not buy you anything and you are still
chugging along with just more mips. What I would rather see is the
actual cycle rate of the processor go up. Give me the mips 400 but
with two processors at 200 mips each, or even 1 400 mip processor.
That might be nice for some workloads, although it would be very bad
for others. Either way, would you buy the 1 CPU 400 MIPS box if it
cost 3 times as much as the 4 CPU 400 MIPS box? IBM has to balance the
cost of making the processor faster against the cost of adding more
processors.
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