Re: UltraSPARC IV

From: Michael Thomas <mhthomas_at_yahoo.com>
Date: Sat, 5 Jun 2004 07:46:21 -0700 (PDT)
Message-ID: <20040605144621.88136.qmail@web50606.mail.yahoo.com>

This can be amazing technology, especially in the wrong hands. ;-)

• Matthew Zito <mzito_at_gridapp.com> wrote:
  >
  ...
  > time, so its a little disingenuous to claim a
  > doubling of performance.
  >
  > Multi-core processing is different from Intel's
  > HyperThreading
  > technology - in that case, its a single processor
  > core that shows
  > itself as two processors. This is because Intel has
  > built a certain
  > amount of possible parallelization into their
  > processors already that
  > generally wasn't being taken advantage of by
  ...

Its an easy trap to fall in. Running my first 3.2GHz CPU Hyperthreading PC I wondered why the individual processors were almost never running over 50% utilization. Must have a really powerful PC. Doh!

Then I realized *if* the two Hyperthreading CPUs totaled over 100% it must be because of pipelining or parallelization of tasks. The only program I ever saw that made both Hyperthreading CPUs go to 100% simultaneously was SETI_at_Home. Obviously, it was programmed to *use* the technology.

I can just see some 'well-meaning' SA (how tactful was that!) attempting to add more databases to one of these systems because "the CPUs are under utilized, and never go above XX percent". Could be entertaining... "My whole system is slow"... you know...

Regards,

Mike Thomas                          

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Received on Sat Jun 05 2004 - 09:43:10 CDT