Cannot obtain the license for spectreRF when interfacing matlab with spectre

Sai,

Why are you trying to run a 12 year old version of Spectre? 

It was changed many years ago to require just a Spectre license (or a single MMSIM token) - I have no means of (easily) running anything quite that old, I'm afraid. You also haven't needed to set LD_LIBRARY_PATH for a long time - I only do this nowadays:

setenv MATLABPATH `cds_root spectre`/tools/spectre/matlab/64bit

Andrew

Hi Andrew,

Thank you so much for your quick and kind reply!

I am also confused about this old version of mmsim, but this is the only mmsim version I could found (by typing module av in the terminal). I also found that the latest spectre version provided by our university is "cadence/spectre/241_344", it is much newer I guess. So I used this spectre to simulate the netlist file:

module load cadence/spectre/241_344

/NAS/cad/cadence/SPECTRE241_344/tools.lnx86/bin/spectre techsweep.scs +log techsweep.out

However, I got the error message:

WARNING (/NAS/cad/cadence/SPECTRE241_344/tools.lnx86/bin/cdnsEnvCheck): This OS does not appear to be a Cadence supported Linux configuration (set environment variable CDS_SKIP_OS_CHECK_ON_STARTUP=1 to suppress). For more info, please run <cdsroot>/bin/checkSysConf <productId>
/NAS/cad/cadence/SPECTRE241_344/tools.lnx86/spectre/bin/64bit/spectre: error while loading shared libraries: libmvec.so.1: cannot open shared object file: No such file or directory

I typed setenv CDS_SKIP_OS_CHECK_ON_STARTUP 1, and run the spectre command again, it still gave me an error:

/NAS/cad/cadence/SPECTRE241_344/tools.lnx86/spectre/bin/64bit/spectre: error while loading shared libraries: libmvec.so.1: cannot open shared object file: No such file or directory

I found that in cadence/SPECTRE171_627/tools/spectre/bin/64bit, there is a spectre file. However, for SPECTRE241_344, it is absent. Is there any difference between these two versions? How could I interface between this spectre and MATALB? If I understand correctly, I should be able to use the toolbox directly (w/o setting any environment variable except for MATLABPATH) after I run the netlist (I guess).

Thanks again for your kind help!

Best Regards,

Sai

BTW, my os is CentOS Linux release 7.9.2009 (Core).

Thanks!

The stream name changed from MMSIM to SPECTRE in 2016 for SPECTRE 16.1 (the previous release was MMSIM 15.1). So that changed a long time ago.

SPECTRE 24.1 requires a minimum of RHEL 8 - so CentOS 7 is too old. I don't understand what you mean about the 241_344 version not having a "spectre file". Clearly it's there, because the error message is reporting it as not being able to run because of the missing shared library (which is one of the consequences of the outdated OS version).

SPECTRE 17.1 is from 2017, so that's 8 years old. I'd advise you to get something more recent - maybe SPECTRE 23.1 if you are stuck on CentOS 7 for now. This is still available on our downloads site.

Andrew

Thank you so much, Andrew! I understand now! I tried to use SPECTRE 23.1, and the license issue has been fixed. However, I still got an error message as below:

Invalid MEX-file '/NAS/cad/cadence/SPECTRE231_802/tools/spectre/matlab/64bit/cds_innersrr.mexa64':
/NAS/cad/MATLAB/R2016a_CentOS6/bin/glnxa64/../../sys/os/glnxa64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by
/NAS/cad/cadence/SPECTRE231_802/tools/spectre/matlab/64bit/cds_innersrr.mexa64)

Error in cds_srr (line 20)
  sig = cds_innersrr(dirname, dataset, signame, verbose);

Error in techsweep_run (line 58)
            struct_n = cds_srr(c.outfile, c.sweep, params_n{1});

I guess it is still a problem related to version. But I have no idea how to fix it... Maybe I should change the MATLAB version? The latest version I have is 2016a.

Thanks again!

Best Regards,

Sai

Sai,

Yes, I think R2016a is too old. I certainly had been able to run Matlab R2022b on RHEL7 (I think if you go too much newer, they drop support for RHEL7/CentOS 7).

Andrew

Hi Andrew,

I see... But the latest MATLAB I can access is 2016a, and I am not able to use a newer version on my PC (due to the policy of our lab...). So is there a comprise under this case? 

Thanks!

Best Regards,

Sai

Sai,

I can't test this, but perhaps try:

setenv LD_PRELOAD /export/releases/SPECTRE231_isr/tools.lnx86/lib/64bit/libstdc++.so.6

(note the path to your SPECTRE231 installation will be yours; this is csh syntax, and if using bash you'd need to use export LD_PRELOAD=... instead).

Then run Matlab after doing this. This would cause the libstdc++.so.6 to use the version from Spectre instead, and so that means that (hopefully) the Spectre toolbox would work.

Andrew

Hi Andrew,

Thank you for your suggestions! I tried it, but I got the license error like before:

Error: License for the SpectreRF option could not be obtained.

I do not ensure that whether I understand correctly, and here is what I did:

module load cadence/spectre/231_802

module load matlab/R2016a/R2016a_CentOS6

setenv LD_PRELOAD /NAS/cad/cadence/SPECTRE231_802/tools.lnx86/lib/64bit/libstdc++.so.6

matlab &

Then I ran the toolbox from matlab and got the error as above. I also tried to change the sequence of loading and setenv .. but I got the same error message.

Thanks again for your help!

Best Regards,

Sai

The error message is actually wrong - it's not been updated since the license change happened. Using Spectre 23.1 with Matlab R2022b and playing with my available licenses, I see that it is checking (in order):

1. Virtuoso_Spectre
2. Virtuoso_Acceler_Parallel_sc
3. Virtuoso_Multi_mode_Simulation

If none of these three are available, you will get the message you are seeing. I suggest you try running:

perf_test -f Virtuoso_Spectre -test_cp -lc 1

and then try this for each of the three licenses above. This will check whether it can checkout the license or not in your environment. 

Note that perf_test is in <SPECTREinstDir>/bin - so you could give the full path to it.

The other thing to check is whether $CDS_LIC_ONLY is set - if so, you should set $CDS_LIC_FILE (in fact you might want to just set that anyway). Maybe either the LM_LICENSE_FILE checking has been turned off by $CDS_LIC_ONLY or maybe you are running Matlab via a wrapper script which sets LM_LICENSE_FILE and loses the Cadence licenses in the process?

Andrew