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adexl montecarlo simulations stuck

hesaliveJim

Using version IC6.17 everything simulates good for ADEL and single simulations but when it comes to ADEXL and say montecarlo it seems forever stuck with no simulation, in fact the job times out. This suggests nothing wrong with spectre 17 (the simulator I'm using) being unable to converge or something mundane like that.

Reading through old posts it is suggested to run virtuoso -nograph

I played about with


setenv CDS_XVNC_TENBASE 7 # The 10-digit number of the VNC port number used by yourself
setenv CDS_XVNC_OFFSET 4 # The single digit of the VNC port number used by yourself

as suggested elsewhere on this forum to try different port numbers

Trying another display...
*WARNING* Unable to open -nograph X Window Display "L:73"
*WARNING* (using "exec /opt/cadence/IC617/tools.lnx86/dfII/../bin/cdsVncserver :73 -co /usr/share/X11/rgb&").
*WARNING* cdsXvnc output may be found in file $HOME/.vnc-cds/L:73.log

and this points to a log in .vnc-cds/

which has the following line:

/opt/cadence/IC617/tools.lnx86/bin/cdsXvncd: /opt/cadence/IC617/tools.lnx86/lib/libgcc_s.so.1: version `GCC_7.0.0' not found (required by /opt/cadence/IC617/tools.lnx86/lib/64bit/libstdc++.so.6)

I have installed gcc version 7 as it was not present, but this did not resolve the matter. I thought cadence uses these libraries from it's own install directories not the system ones anyway.

I have installed xfonts 75dpi and 100dpi as well as the xfont base. I do not know the directory where virtuoso needs to find them or whether this matters but I noticed on some other posts that this is important to be installed.

running linux command to check fonts:

fc-cache -fv | grep 100dpi

I get:
/usr/share/fonts/X11/100dpi: caching, new cache contents: 358 fonts, 0 dirs
/usr/share/fonts/X11/100dpi: skipping, looped directory detected

not sure if this is good.

I have now run out of ideas on how to resolve this.

  • Is there a good reason why you're using such old versions? We no longer use cdsVnc (this changed during IC618/ICADVM20.1 release timeframe) - now we use the native Xvfb mechanism provided as part of various Linux distributions. 

    Neither IC6.1.7 nor SPECTRE17.1 are supported any more (in fact they are a good 5 years past their end of support dates), so I'd recommend using something more recent.

    Debugging issues like this so far in the past is hard. I might be able to give some help if I knew which Linux version you're using - what does "lsb_release -a" output?

    Andrew

  • in reply to Andrew Beckett

    Hi Andrew I think you're right something more up to date's needed. I think the PDK documentation said 6.17 so I'll see which newer version the foundry thinks might work with their kit.

  • in reply to hesaliveJim

    It's pretty likely that any newer version (at least IC6.1.8) will work with the PDK. Often foundries just record which version they tested with, and don't re-test as newer IC versions become available.

    Andrew

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