Re: [bgl-discuss] Comparison between BGL nodes and standard PPCs

[Steven Pieper <pieper@xxxxxxxxxxx>]

Don,

  Do you get any benifit from 440d?  I get none or even a slow down.  In
a typical case this leaves me with only 265 MFLOPS/processor (using just
qarch=440, but O5, etc) compared to 429 on seaborg.  I'm told that the
next version of the compiler might be better.

steve

>>> What are the major differences other than the presence of communication
>>> hardware between the BGL processors and other Power PC chips, Power 3, for
>>> example? I ask, since despite the fact that both this chip and the
>>> Power 3 have 2 floating point units and the rest of the unit has the
>>> Power PC architecture, and I use the same compiler (xlf), the performance
>>> I get from the 700 MHz BGL processor is less than half what I can get from
>>> a 375 MHz Power 3, even when I use the -qarch=440d.
>>>                                    Don Sinclair
>>> 
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