Cadence - memory report problem

[t4_v]

Hi,

I'm running a simulation using Cadence software. I'm using ADE L with AMS simulator. During simulation I get following notifications in CDS.log file:

\# Available memory: 25,735 MB at UTC 2015.11.09 21:23:30.124
\# Memory report: Maximum memory size now 26,215 MB at UTC 2015.11.09 21:23:30.124
\# Memory report: Maximum memory size now 26,842 MB at UTC 2015.11.09 21:24:20.126
\# Memory report: Maximum memory size now 27,424 MB at UTC 2015.11.09 21:25:20.129
\# Memory report: Maximum memory size now 27,986 MB at UTC 2015.11.09 21:26:40.135
\# Available memory: 28,260 MB at UTC 2015.11.09 21:29:10.151
\# Memory report: Maximum memory size now 28,740 MB at UTC 2015.11.09 21:29:10.151
\# Memory report: Maximum memory size now 27,848 MB at UTC 2015.11.09 21:34:50.113
\# Memory report: Maximum memory size now 28,524 MB at UTC 2015.11.09 21:36:20.118
\# Memory report: Maximum memory size now 29,189 MB at UTC 2015.11.09 21:37:10.121
\# Memory report: Maximum memory size now 30,035 MB at UTC 2015.11.09 21:37:30.122
\# Memory report: Maximum memory size now 30,921 MB at UTC 2015.11.09 21:40:00.136
\# Available memory: 30,917 MB at UTC 2015.11.09 21:41:20.143
\# Memory report: Maximum memory size now 31,595 MB at UTC 2015.11.09 21:41:30.144

and the farm computer where I run the simulation is restarted, thus I cannot finish my simulation.

I looked into Cadence Help, Google and searched Cadence manuals, but what I found is only a chapter titled "Tips for Reducing Memory Usage (memory)" in "Virtuoso Spectre Circuit Simulator Reference" (page 422 for document from 2014.10). There are four tips, from which only one:
"2. Try ulimit/unlimit command to adjust memory limitations."

might be useful for me. However, I'm not able to find how to use ulimit or unlimit commands.


My questions are:
1. Does "Available memory / Memory report: Maximum memory size now ..." refer to my RAM?
2. How to solve this problem?
3. How to use ulimit/unlimit commands?

 

[Ngan K. Hoang]

I think it is ROM. You may need to clean your simulation folder and save only necessary node/current when simulating.

 

[BradtheRad]

Your report tells of memory sizes of 25 GB and more. That's sizable. Each line changes by a gigabyte.

You might learn more by opening the Task Manager (press Ctrl-Alt-delete, assuming you have Windows). Look through your list of applications and processes. See if anything appears out of place. Watch for a runaway process that does things that are suspect (example, consumes increasing memory).

the farm computer where I run the simulation is restarted

To get more information than Task Manager gives you, download Sysinternals Process Explorer. (Freeware utility. Locate by a search at www.microsoft.com ).

Sysinternals will tell you whether those 25 GB blocks are virtual memory, or what.

You may see something happen that triggers a restart.

I am not familiar with Cadence so I don't know if it could do anything to cause a restart.