Learning Forum

[martinmi]

Hallo, 

I'm currently following the Lumerical Wiki article https://optics.ansys.com/hc/en-us/articles/360024974033-Running-simulations-using-terminal-on-Linux on how to run the solvers eme and fdtd in the terminal. I have a few difficulties:

1)  Running the following code "/opt/lumerical/v241/bin/eme-engine -t 400 ~/Downloads/EMERun1.lms -use-solve" should start the EME solver and it does. The only problem I have is the "-t 400" part. I only check one eme-solve license instead of several. When I use the equivalent fdtd command " /opt/lumerical/v241/bin/fdtd-engine -t 400 ~/Downloads/FDTDRun1.fps -use-solve", I check 1 + all avaivalben solver licenses in my package. 

2)  Is there an option that allows me to run an EME propagate in this command line as well? I know I can have a special script with all the necessary commands and run it, but I'm trying to do everything in the terminal without additional scripts. 

Best regards,

Martin 

[Lito]

@martinmi, 

Try to run MPI on Linux.

>Running simulations with MPI on Linux – Ansys Optics 

e.g. Intel MPI:

/mpirun -n 400 /opt/lumerical/v241/bin/eme-engine-impi-lcl -t 1 simulationfile.lms 
/mpirun -n 400 /opt/lumerical/v241/bin/fdtd-engine-impi-lcl -t 1 simulationfile.fsp

e.g. Open MPI: 

/mpiexec -n 400 /opt/lumerical/v241/bin/eme-engine-ompi-lcl -t 1 simulationfile.lms 
/mpiexec -n 400 /opt/lumerical/v241/bin/fdtd-engine-ompi-lcl -t 1 simulationfile.fsp

 

[martinmi]

I will try but i dont habe the admin rights in the moment to install Open MPI or Intel MPI on the Linux Server. 
I still dont get why i need to run OpenMPI or IntelMPI when i am not trying to run the simulation on other servers? And why when i am running the FDTD command i am able to see that i am checking all available FDTD Solver Licenses (1 + rest) like it said in the Lumerical artical that i linkt, but doing so with the EME engine i cannot? 

Best Reagrds, 

Martin 

[Lito]

@Martin, 

If you are only running on the local computer (1 computer), you can run without MPI. Running with 400 threads (-t 400) on the local computer (localhost) will take up 13 solve licenses (400/32). Ensure that you have 400 threads on the local computer and you are not oversubscribing the number of threads that what is available on the local machine. 
>>Ansys optics solve, accelerator, and Ansys HPC license consumption – Ansys Optics 

#try running without '-use-solve' argument
/opt/lumerical/v241/bin/eme-engine  -t 400 simulationfile.lms
/opt/lumerical/v241/bin/fdtd-engine -t 400 simulationfile.fsp

You can check the running processes with top. 

#run from terminal
top -H 

With the (-H) argument, should show each eme engine process/cpu thread.