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Insufficient memory to run PSS analysis - how to resolve?

apaj

Hello.

I did see that there are three recent threads with very similar titles, but - unfortunately, with completely different problems described.

I use up-to-date MMSIM and IC5 (2012_2013 package installed on a 32 bit machine) and I have given a swap file to the PSS analysis. I am trying to get IIP3 post-layout simulation to run for my circuit (QRC used for extraction). I want it measured at 8 and 9 GHz with 200 MHz harmonics. I do only 6 steps for signals of power in the range of -20:5 dBm.

Nevertheless, the simulation breaks telling me - insufficient memory. During the simulation, it doesn't really use the file I gave it (<path>/Desktop/pss_swap - it's always 0 bytes). What it actually does is that it creates about twenty files called pss_swap_0, pss_swap_1, and so on, each of them about 1.2 GB. And it does this for every point of calculation.

Now, my question is, is it possible (and how?) to overcome this? If I choose a higher limit for extraction my S-parameters change, so I can not go higher on this. Less than 6 points... does it really make sense? Number of harmonics must remain the same since I need it calculated at certain frequencies. 

Do you have any suggestions how to get this done?

Thank you very much for your time and effort.

Parents

  • Once again, thank you very much.

    Issuing the command printenv, I find that no SPECTR_FEATURE_FILE variable is set and that $PATH includes the path to <mmsim_install_dir>/tools/bin. Here are some pieces of the printenv output:

    QRC_HOME=/cadence/2012_2013/pve
    MMSIM_DIR=/cadence/2012_2013/mmsim
    PATH=/usr/lib/qt-3.3/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/<user>/bin:/cadence/2012_2013/ic5/bin:/cadence/2012_2013/ic5/tools/bin:/cadence/2012_2013/ic5/tools/dfII/bin:/cadence/2012_2013/mmsim/bin:/cadence/2012_2013/mmsim/tools/bin:/cadence/2012_2013/mmsim/tools/dfII/bin:/cadence/2012_2013/assura/bin:/cadence/2012_2013/assura/tools/bin:/cadence/2012_2013/assura/tools/dfII/bin:/cadence/2012_2013/pve/bin:/cadence/2012_2013/pve/tools/bin:/cadence/2012_2013/pve/tools/dfII/bin:/cadence/2012_2013/process/utils:/cadence/cdslic/bin:/home/<user>

    AHDLCMI_GCC_HOME=/usr
    CDSDIR=/cadence/2012_2013/ic5
    CDS_Netlisting_Mode=Analog
    CDS_AHDLCMI_ENABLE=NO
    ASSURAHOME=/cadence/2012_2013/assura
    CDS_INST=/cadence/2012_2013/ic5

    Could this variable that you mention somehow be set without showing in the output of printenv?

    Or I just really need a reinstall of MMSIM? Once again, I did download and install the MMSIM from 2012_2013 package, just several weeks ago...

    Thank you.

Reply

  • Once again, thank you very much.

    Issuing the command printenv, I find that no SPECTR_FEATURE_FILE variable is set and that $PATH includes the path to <mmsim_install_dir>/tools/bin. Here are some pieces of the printenv output:

    QRC_HOME=/cadence/2012_2013/pve
    MMSIM_DIR=/cadence/2012_2013/mmsim
    PATH=/usr/lib/qt-3.3/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/<user>/bin:/cadence/2012_2013/ic5/bin:/cadence/2012_2013/ic5/tools/bin:/cadence/2012_2013/ic5/tools/dfII/bin:/cadence/2012_2013/mmsim/bin:/cadence/2012_2013/mmsim/tools/bin:/cadence/2012_2013/mmsim/tools/dfII/bin:/cadence/2012_2013/assura/bin:/cadence/2012_2013/assura/tools/bin:/cadence/2012_2013/assura/tools/dfII/bin:/cadence/2012_2013/pve/bin:/cadence/2012_2013/pve/tools/bin:/cadence/2012_2013/pve/tools/dfII/bin:/cadence/2012_2013/process/utils:/cadence/cdslic/bin:/home/<user>

    AHDLCMI_GCC_HOME=/usr
    CDSDIR=/cadence/2012_2013/ic5
    CDS_Netlisting_Mode=Analog
    CDS_AHDLCMI_ENABLE=NO
    ASSURAHOME=/cadence/2012_2013/assura
    CDS_INST=/cadence/2012_2013/ic5

    Could this variable that you mention somehow be set without showing in the output of printenv?

    Or I just really need a reinstall of MMSIM? Once again, I did download and install the MMSIM from 2012_2013 package, just several weeks ago...

    Thank you.

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