Release 7.5 MADYMO Coupling Manual

8.2.6 Argument Interface

When madymo_cpl calls exec2 to start both solvers, a standard argument list is passed to the

PARTNER solver. Of course not all PARTNER solvers are started in the same way. This means

a wrapper script will have to be written, as intermediate layer; the ’febin’ option should be set

to point to this wrapper script. The wrapper script is started from exec2 with this command:

<febin> -nrproc <npfe> -input <feinput> <feargs>

The wrapper script will have to parse these arguments into a valid command to actually start

the PARTNER solver and/or MPIRUN. If HP-MPI is used, the PARTNER solver wrapper script

is started in an environment where a variable FEMPIRUN is set; FEMPIRUN points to the

’mpirun’ executable, with a number of options:

FEMPIRUN = "<mpirun> -spawn -prot -nameserver <nameserver> [-hostfile <PARTNER hostfile>]"

The wrapper script then has to extend the FEMPIRUN variable with exports for the PARTNER

solver (like license variables, LD_LIBRARY_PATH, etc), other desired HP- MPI arguments, the

PARTNER solver executable, and the ’feargs’ string.

Example wrapper scripts for LS-Dyna, MPP-Dyna, PAMCrash, and RADIOSS are given in

Sec.

8.2.9.

8.2.7 Checklist and Example

These are the steps to start a MADCL coupled run:

• Write or obtain a wrapper script for the PARTNER solver

• When using HP-MPI, set the MPIRUN environment variable

• When using HP-MPI and multiple hosts are available, write a host ﬁle

• If needed/desired, write a conﬁguration ﬁle

As an example, a madymo_cpl command could look like this:

<madymo bin dir>/madymo_cpl -febin <script dir>/cpl_partner.sh \

-npmad 4 -npfe 28 -coupling mpi -mpilib hpmpi \

-hostfile myhostfile -madargs <madymo args> -- \

-feargs <partner args> -- <xml deck> <partner deck>

Now madymo_cpl will:

• Use MADYMO executable in "<madymo bin dir>"

• Use "<script dir>/cpl_partner.sh" as PARTNER wrapper script

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