[PCB_FORUM] Re: System requirements for 15.2

    I have also seen the very long delays when sliding certain diff pairs also 
on large designs.  I found the problem is caused by positive dynamic shapes in 
close proximity somewhere in the design to the diff pair signal.  I believe the 
drc and healing function is slowing it down even when the slide is not close to 
the shape.  I moved the positive dynamic shape off the board temporarily and 
everything is back to speed.  We do very large designs on Dell Xeon 2 ghz 1 GB 
computers with dual nvidia monitors no problem.  I also have a nice switch box 
that is controlled by the scroll lock button that swithes one monitor to 
another computer because the main computer does not have dual processors.  I 
got it at Fry's for about $40 and it is made by Ingear.
  

-----Original Message-----
From: george.h.patrick@xxxxxxxxxxxxxx [mailto:george.h.patrick@xxxxxxxxxxxxxx]
Sent: Thursday, May 19, 2005 4:44 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [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.tektronix.com     <http://www.pcb-designer.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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