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<font face="Arial,sans-serif"><font size="2">isn't have 10 slower
'datawulf' nodes better than 1 at the same speed (with them added up)
for data access? surely the optimal speed is a processor that can
handle the intensive IO streaming and a kernel + a bit of overhead for
good luck. <br>
<br>
another idea i have floating - with lower speed cpu's eg: 500mhz or
even up to 1066mhz - cant you use 'normal' as you l1 cache??? surely
that is good for data steaming eg: a 1GHz cpu with 1024MB l1 cache, a
further 3GB running at 400MHz, attached to 4 sata 2 drives? <br>
<br>
<span type="cite">Peter St. John wrote:</span>
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<div><font face="Arial,sans-serif" size="2">Greg,</font></div>
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<div><font face="Arial,sans-serif" size="2">Well that's fair of
course, I should have said that 5GHz is an unachiveable upper bound for
a sufficiently distributable application. If I wanted to add some huge
number of integers, which can be generated by some simple formula in
ranges at each node, then 10 500MHz machines generating ranges and then
computing subtotals would be almost as fast as one 5GHz machine, but
for any real apps we would not see such a gain. I'm sure I"m
overoptimistic about the "embarassing parallelism" of my own app, but
pretty much it's pretty embarassing I'm pretty sure :-) Got's to see.
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<div><font face="Arial,sans-serif" size="2">Peter<br>
<br>
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<div><font face="Arial,sans-serif" size="2"><span class="gmail_quote">On
8/28/07, <b class="gmail_sendername">Greg Lindahl</b> <<a href="mailto:lindahl@pbm.com">lindahl@pbm.com</a>> wrote:</span>
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<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;"><font face="Arial,sans-serif" size="2">On Tue, Aug 28, 2007 at 01:28:39PM
-0400, Peter St. John wrote:<br>
<br>
> So max thruput would be 10x 500 MHz, sorta a 5GHz computer for
<br>
> $1600,<br>
<br>
No, it's like 10 500 Mhz computers, and very unlike a 5 Ghz computer.<br>
<br>
I know some marketing types, and even the CEO of Sun, likes to add up<br>
Ghz. But it's silly to do so.<br>
<br>
-- greg
<br>
<br>
<br>
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