Question: What do
I do to compare the processor performance of a new Oracle
server compared to the old Oracle server CPU performance?
Is there a formula for calculating the differences in CPU
processing speed.
Answer: There are two dimensions
to measure CPU speed, CPU response-time (per transaction)
and processor throughput (meg per second). Oracle
databases that are optimized for fast response time (first_rows
optimization) tend to use more CPU than Oracle databases
that are optimized for maximum throughput (all_rows
optimization)
I have seen cases where a brand-new 8 CPU server out
performs a five-year-old 32 CPU server. The speed of a
CPU depend on more than just the raw chip speed (in
Gigahertz) plus the hyper-threaded CPU), and the use of T1
RAM co-located near the processors.
For a new Oracle Sun server, we see the
Oracle Sun CMT servers. The Sun docs note they the new
CMT architecture considers real-world workloads:
"Sun's UltraSPARC processor engineering team has been
obsessed with something entirely different: maximizing the
throughput of real-world applications and workloads"
There is no formula to compare CPU processing speeds for
a real-world workload, but you can use RAT (Real Application
Testing) to capture a real-world workload and then replay
that workload on both servers, noting the difference in CPU
utilization. This can then be extrapolated to predict
the overall CPU differences between the old and new servers.
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