number of treads with CCX

jvrajadelljvrajadell
How many cores can we use when an analysis  is running from Mecway?
I read that we can configure the number of cores in CCX alone when we compile and install the program but I don't know how I can configure it in Mecway. My PC never uses more than 25% CPU cores, 2 cores 




Comments

  • jvrajadelljvrajadell
    I want say Number of cores with CCX
  • VictorVictor
    1) Set the environment variable OMP_NUM_THREADS = 8, where 8 is the number of threads you want. It might be best to make that a bit less than the actual number of cores, but I'm not sure. This PC -> Properties -> Advanced system settings -> Environment Variables -> System variables -> New ... [See attached picture]

    2) Install a CCX compiled with multithreading, such as the one from bConverged or the _MT.exe one from General Electric.

    3) Tell Mecway to use that. Tools -> Options -> CalculiX -> Solver -> Browse... and pick C:\Program Files (x86)\bConverged\CalculiX\bin\ccx.bat or as appropriate for where you installed it.


  • jvrajadelljvrajadell
    Can it run for symmetric stiffness/mass contributions with more than 1 cpu?

    Now it can run with 8 cpu for stress calculation and spooles solver but one for symmetric stiffness/mass contributions
  • SergioSergio
    Add a new environment variable with the number of cores that you want to use:

    CCX_NPROC_STIFFNESS = 8
  • jvrajadelljvrajadell
    thanks
  • jvrajadelljvrajadell
    :( 

    In my PC it doesn't work

    too many enviroment variable...

    OMP_NUM_THREADS
    CCX_NPROC_EQUATION_SOLVER
    CCX_NPROC_STIFFNESS


  • SergioSergio
    These are the ones that I have setted, all with 8 cores:

    CCX_NPROC_STIFFNESS
    NUMBER_OF_PROCESSORS
    OMP_NUM_THREADS

    And, using the CXX-MT 64 bits solver provided in the Mecway Beta 3, ccx is using 8 cores for stress calculation, stiffness / simetric mass contribution, and factoring with spooles (see attached). 

    If you use CCX only, it will use 8 cores for stress and stiffnes calculation, using CCX-MT will do it also for factoring.


  • jvrajadelljvrajadell
    edited April 2017
    I've  NUMBERS_OF_PROCESSORS too

    How Mecway with Calculix 2.12 has problems with buckling, I'm using Mecway7 but with bConverged Calculix 2.10

    I'm trying to simulate a material with parabolic stress-strain curve, now I don't need buckling, I'm going to run the problem with CCX that is in Mecway instalation

    thanks

  • SergioSergio
    Are you using the executable directly or by means of the batch file provided by bConverged? In that case the batch file will set up his own environment variables also, so you should edit it to add the multiple core option.
  • jvrajadelljvrajadell
    batch file

    but now it's running with 2.12 CCX_MT ,  ALL WITH 8 CPUS !!!!!!

    :))
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