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- Re: Nonlinear systems and nonlocal supercomputing
Note that such a crossbar would HAVE to be decompoase into a number of
layers with fewer ports and more layers--such that sooner or later
routing decisions are performed within a chip that has a 'reasonable'
number of pins.
The only other option is to route conflicting request out some link
that is not currently busy. The receiving 'bar will route it back (or
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- Re: Nonlinear systems and nonlocal supercomputing
news:4B9F1E96.8000205@patten-glew.net...
And I might add that "no magic, just a sufficiently large crossbar
switch..." is slight of hand at best. Consider a network of 10,000
nodes. Is one to build a single crossbar (non blocking I presume)
that has 10,000 input ports and 10,000 output ports all running at
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- Re: Nonlinear systems and nonlocal supercomputing
The naive planar layout for a fat tree - a 1D line of processors, with tracks for wires - is N lg N in nodes, but is
2(N^2) in "tracks^2".
The less naive planar layout - almost like H-trees - is the recurrence A(2N) = 3*A(N) =9*A(N/2) = ... = 3^log2(N)*A(1) =
N^log2(3). Better than N^2, but less regular.
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- Re: Nonlinear systems and nonlocal supercomputing
But if all I need to do is to stream data (no addressing, just a
serial stream), I should be able to connect several frames at very
high bandwidth using optical cable, if necessary? The Fourier
transform (with complicated addressing) would only need to be done
within a frame. It's not a huge deal. Maybe only a factor of two in
- Re: Nonlinear systems and nonlocal supercomputing
And, right now, about as much as can be packaged in one 'frame'.
I realize that overall, this idea-set is targeted towards the database
server more than the supercomputer.
Mitch
- Re: Nonlinear systems and nonlocal supercomputing
On Mar 15, 1:28 pm, an...@mips.complang.tuwien.ac. at (Anton Ertl)
wrote:
About as good as ASCII art can do. No motherboard and wrap the
ensemble with a metal skeleton to hold the boards, fans, and route
power and provide for good looks.
Mitch
- Re: Nonlinear systems and nonlocal supercomputing
I can provide specific answers as to why doing the math correctly (as
opposed to "modeling") is highly desirable for that kind of scale
separation, but this is not the appropriate forum.
Robert.
- Re: Nonlinear systems and nonlocal supercomputing
On Mar 15, 5:17 am, Terje Mathisen <"terje.mathisen at tmsw.no">
wrote:
I am allowing myself to dream of an optical phased array transmitter
with electronic beam steering
together with a fixed mirror.
The feature sizes are already much smaller than visible wavelengths,
after all.
And if the receiver is omnidirectional, then you just have a
- Re: Nonlinear systems and nonlocal supercomputing
In article <2815d946-ef19-41d2-bd3c-87418 a873...@x12g2000yqx.googlegrou ps.com>,
Some of us remember when that was said about 4 MB :-)
Regards,
Nick Maclaren.
- Re: Nonlinear systems and nonlocal supercomputing
The 4TB quoted is about where the interesting science would begin.
Assuming that you can do saxpy calculations from one box to another at
a reasonable rate (contents of one box + constant * contents of a
second box = contents of a third box, in effect treating the entire
4TB box as a gigantic vector register), you could do some interesting
- Re: Nonlinear systems and nonlocal supercomputing
...
Hmm, several CPU boards. I originally thought about only one CPU
board, with a relatively conventional arrangement. But reading your
description again, maybe you mean:
------------- backplane
------------- motherboard
Did I get that right? That would be 1/2m x 1/2m x 1m.
- anton
- Re: Nonlinear systems and nonlocal supercomputing
On Mar 14, 1:25 pm, an...@mips.complang.tuwien.ac. at (Anton Ertl)
wrote:
Now that you point this out, I end up agreeing with you.
But cnsider adding space around each side of the boards to hold the
board in place (the rack) provide connections (the backplane) and
other communications ports (front side connectors) on both the CPU