[PCB_FORUM] Re: System requirements for 15.2

    I have a single 2.8 ghz with 2 gb of memory and two 21" monitors in my 
office laying out similar boards with 
900 "matched" diff pairs and many positive shapes. The lag between my home 
1ghz / 1gb of memory is so bad
that I spend more time in work. I don't really wait to often but I also 
try to add the planes in at the end of the layout.
The dual monitor setup is so good I'll never go back to just one. Whether 
using CM to highlight nets, groups 
or Concept to crossprobe between it and Allegro. We started with one 21" 
and an old 17" monitor and liked it so much
we invested in another 21".

Paul Keefe





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[PCB_FORUM] Re: System requirements for 15.2






 
I have a dual 2.66 GHz Xeons w/ 2 GB of memory.  I still get lags on large 
boards with lots of planes.  I am going to try 3 GB of memory (the most I 
can stick in it), but there was almost NO improvement from 1 GB to 2, so I 
don't think that's going to help :(
 
There are some differential pairs that have a 20 second lag in them from 
the time I start sliding to the time they actually move.
 
Sure would be nice if Cadence would multi-thread Allegro so it could 
actually USE both processors.  It's going to get worse as Intel switches 
to multi-core processors instead of increasing bus speeds.
-- 
George Patrick
Tektronix, Inc.
Central Engineering, PCB Design Group
P.O. Box 500, M/S 39-512
Beaverton, OR 97077-0001
Phone: 503-627-5272         Fax: 503-627-5587
http://www.tektronix.com    http://www.pcb-designer.com
It's my opinion, not Tektronix' 
-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Sawyer Jayne
Sent: Thursday, May 19, 2005 14:34
To: icu-pcb-forum@xxxxxxxxxxxxx
Cc: Anderson Gary; Cech Charles
Subject: [PCB_FORUM] System requirements for 15.2

 
Since moving to 15.2 and positive planes we have been experiencing 
considerable lag time when running DRC, using the electrical constraints 
for diff pairs or doing edits to the planes. 
 
The boards we are having issue with are 
17" X 14"
16 layers
23477 connects
24000 via
 
We are looking to upgrading our hardware. I am hoping that some one in the 
group might be working with similar conditions and already have updated to 
a machine that could handle it. If any one can help me to spec a capable 
machine please let me know.
 
Thanks in advance,
Jayne Sawyer

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