Re: [APML] Multiprocessors and Image Processing

[Mark Jenkins <mrj@bigcigarastronomy.com>]

I agree with Kent.

I have a Dual 1.25Ghz  G4 with 1.5 Gig  of ram running OS X and for 
photoshop work it smokes both my Dual 867Mhz PIII with 1 Gig of Ram and 
my 1.7Ghz P4 with 1 Gig Ram. It is also a much faster photoshop machine 
than Trent's new 2Ghz Gateway.

I have not yet directly compared it to the >2Ghz P4s but I bet it will 
still best them in most Photoshop operations. Photoshop is highly 
optimized for AltiVec and dual processors, and when you have dual G4s 
running dual AltiVec processes, well, I think you can see where this is 
going.

FYI...

"Motorola's AltiVec Technology, embodied in the G4 processor, expands 
the current PowerPC architecture through addition of a 128-bit vector 
execution unit that operates concurrently with existing integer and 
floating-point units. This provides for highly parallel operations, 
allowing for simultaneous execution of up to 16 operations in a single 
clock cycle. This new approach expands the processor's capabilities to 
concurrently address high-bandwidth data processing (such as streaming 
video) and the algorithmic intensive computations which today are 
handled off-chip by other devices, such as graphics, audio, and modem 
functions.The AltiVec instruction set allows operation on multiple bits 
within the 128-bit wide registers. This combination of new 
instructions, operation in parallel on multiple bits, and wider 
registers, provide speed enhancements of up to 30x on operations that 
are common in media processing."

FWIW-YMMV

Mark Jenkins
mrj@bigcigarastronomy.com
http://www.bigcigarastronomy.com

"The true character of liberty is independence, maintained by force."  
-Voltaire

On Monday, Feb 24, 2003, at 14:36 America/Chicago, KGKIRKLEY@aol.com 
wrote:

> Steve:
> Go for a Mac G4 and load it with 2 Gig of ram..........ever so fast, on
> Photoshop images.
>
> Kent Kirkley
>

_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo