On 16/01/2015 11:16 PM, John McKown wrote:
On Fri, Jan 16, 2015 at 8:24 AM, Bob Shannon <[email protected]>
wrote:
So, as an extremely silly example. SMT will not "help" in the following
program: I.e. in a "hard loop" which uses data & instructions
There are exceptions to every rule. If that’s the type of workload you
run, turn SMT off.
Bob Shannon
Rocket Software
​Basically, I'm trying to conceptualize how z SMT compares to Intel's.
Better to compare it to the POWER arch
http://www-03.ibm.com/systems/resources/pwrsysperf_SMT4OnP7.pdf.
It may be CISC not RISC but those lines are getting more blured with
every new churn of z. I would imagine that the
SIMD vector units also originate from POWER. It may seem far fetched
but I can see a time in the not too distant future
when the two architectures are converged.
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