[PCB_FORUM] DRC

Hello again.

 

If it can help someone we found something interesting here:

 

We have 2 big boards (really big) with a lot of electrical constraints and 
special shapes (one is called horse shoe ;-)

When we want to update DRCs, the system runs with 50% of processor, and then 
crashes or terminates without updating DRCs or saying that system is out of 
memory ....

 

We send the biggest one to Cadence.

They replied that it took less than 5 minutes to update and everything is OK.

We tried to do it in another service, it runs, less than few minutes..

 

We suspected that the setup was wrong... I tried to find, removing SKILL, 
variable environment, ... It works when I remove a environment variable with 
PATH with some setup...

I found that if I remove our env file, it works but I cannot find where exactly.

 

I have a look to Sourcelink and found a solution given for 15.2 with a PCR for 
15.5.

So it cannot be this because we are in 15.7, test were done in 16.01. The PCR 
should be present in these releases.

 

I try nevertheless: I removed the use_accurate_delay_calculation.

 

And ... it works!

(never mind: we successfully asked for a more powerful computer! ;-)

 

Some bugs seem to reappear at Cadence...

 

Sourcelink said:

Update DRC & Database Check run until system is out of memory

Error Message:

Memory Error...

Problem statement:

When I run update drc or database check with drc enabled, the process runs and 
runs 

until I get a memory error.  What can I do to fix this?

Solution:

In this case, the problem was cause by the variable 
use_accurate_delay_calculation 

being enabled. This has been reported in PCR 799814 and fixed in the 15.5 
release.

 

Workaround:

 

1) Disable use_accurate_delay_calculation from Setup > User Preferences > 

Signal_analysis and then run Update DRC or database check.

 

 

William Billereau
CERN group TS / DEM
1211  Genève  23 Suisse


Tel: (+4122) 76 73403 
mail to:  william.billereau@xxxxxxx <mailto:william.billereau@xxxxxxx>

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