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Why is Patran taking forever to attach my op2 file?

toby.t.norris
I just did a fresh install of Patran 2017. I am running a 3e6 dof line sol101 model that runs in 8 minutes and produces an op2 file that is 5.9GB in size. It takes over 2 hours to attache the op2 in Patran. Once attached then I can do my post processing. Then if I exit from Patran and then start patran again with the same attached file I have to wait another 2 hours for the first fringe plot. Please give me a clue how to fix this. This makes Patran 2017 unusable. I do not recall having this type of problem with Patran 2014. I have 64GB of RAM and I think I have default settings for Patran and Nastran.
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  • 0
    Looks like a swapping issue, can be changed with the PDB_C_CACHE_SIZE variable
     
    Assuming you run Patran on Windows, I recommend to create a file “user_setup.pm” in your user home directory containing these lines:
     
    # ---PDB_C_CACHE_SIZE = 50% of RAM
     setEnv('PDB_C_CACHE_SIZE','32000000000');
     
     # set Nastran mem for attach op2, attach master and 2013ff nastran file import, max. 8GB.
     setEnv('DRANAS_NAST_MEM','2GB', 'OverWrite');
     
    # set Nastran SDIR and DBS for attach op2 and attach master, nifimp since 2013.
    # to a fast partition, here c:\scrach
     setEnv('TMP', 'c:\scratch', 'OverWrite');
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  • 0
    Looks like a swapping issue, can be changed with the PDB_C_CACHE_SIZE variable
     
    Assuming you run Patran on Windows, I recommend to create a file “user_setup.pm” in your user home directory containing these lines:
     
    # ---PDB_C_CACHE_SIZE = 50% of RAM
     setEnv('PDB_C_CACHE_SIZE','32000000000');
     
     # set Nastran mem for attach op2, attach master and 2013ff nastran file import, max. 8GB.
     setEnv('DRANAS_NAST_MEM','2GB', 'OverWrite');
     
    # set Nastran SDIR and DBS for attach op2 and attach master, nifimp since 2013.
    # to a fast partition, here c:\scrach
     setEnv('TMP', 'c:\scratch', 'OverWrite');
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