Paul Gilmartin pisze:
On Mon, 8 Feb 2010 09:09:20 +0100, R.S. wrote:
Timothy Sipples pisze:
[...]
Also, I'm quite sure that there's presently no cycle steering or other
clock speed tricks to adjust power consumption dynamically, at least on the
z cores. Considering the role mainframes play (running at high utilization
rates), this design philosophy, to optimize for continuous operations,
makes a lot of sense.
Wrong. Cycle steering is present when REALLY needed. That means when
temperature grows up. It was discussed on the forum. Of course it covers
all the CPs.
So, no power reduction when a processor is in a wait state?
I don't know. I suspect no. In PC program hang usually means 100% CPU
utilization. BTW: Power consuption depends on type of instruction
performed. I was told that it was analyzed by IBM constructors - what
parts of CPU are heated during given operations.
And capped general engines use no less power than specialty
engines?
What if _all_ CPs are capped?
Capped engines work on full speed. Capping does mean that some CPU
cycles are stolen by microcode. I mean models like 401, 606, not HMC
capping. So even the slowest z10EC 401 works on the same CPU speed as
701. Proof: zIIP etc. works on full speed and they can share the same
physical PU (sorry for pleonasm).
Of course HMC capping does not change CPU speed as well.
--
Radoslaw Skorupka
Lodz, Poland
--
BRE Bank SA
ul. Senatorska 18
00-950 Warszawa
www.brebank.pl
Sąd Rejonowy dla m. st. Warszawy
XII Wydział Gospodarczy Krajowego Rejestru Sądowego,
nr rejestru przedsiębiorców KRS 0000025237
NIP: 526-021-50-88
Według stanu na dzień 01.01.2009 r. kapitał zakładowy BRE Banku SA (w całości
wpłacony) wynosi 118.763.528 złotych. W związku z realizacją warunkowego
podwyższenia kapitału zakładowego, na podstawie uchwały XXI WZ z dnia 16 marca
2008r., oraz uchwały XVI NWZ z dnia 27 października 2008r., może ulec
podwyższeniu do kwoty 123.763.528 zł. Akcje w podwyższonym kapitale zakładowym
BRE Banku SA będą w całości opłacone.
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
