Registering Your Credentials for Distributed Simulations on Windows

You must register your credentials before running distributed simulations on multiple nodes. If you wish to use Microsoft MPI, your servers must be running Windows Server 2012 R2 or later with HPC Pack 2012 R2 or later installed. Otherwise, you can use Intel MPI.

This section describes how to:

Registering Your Credentials on Windows versions without HPC Pack (Intel MPI)

To register your credentials on versions of Windows that do not have the HPC Pack installed (and for which you can only use Intel MPI):

Start a Command Prompt from the Start menu.
Before registering credentials, ensure that the Intel MPI Service is running on all hosts. To do this, use the following command line on each host:
```
<path>\hydra_service.exe -status
```
Where <path> is the full path to the hydra_service.exe executable file in your Simcenter STAR-CCM+ installation directory. The following is an example of a typical path for a 64-bit installation using Simcenter STAR-CCM+ version 19.04.###:
```
C:\Program Files\Siemens\19.04.###\STAR-CCM+19.04.###\mpi\intel\2019.7.216\win64\intel64\bin
```
If there are multiple installations of Simcenter STAR-CCM+ on the workstation, it is possible that the running Intel MPI service could be too old. Always use the Intel MPI service from the most recent installation of Simcenter STAR-CCM+. To remove an existing Intel MPI service, as administrator, use:
```
<path>\hydra_service.exe -remove
```
To start the service on a host, as administrator, use:
```
<path>\hydra_service.exe -install
```
Additional functionality, including how to restart and stop the service, is described in the help:
```
<path>\hydra_service.exe -help
```
To register your credentials:
1. Enter the command:
```
<path>\mpiexec.exe -register
```
2. Enter your username and password when requested.

Registering Your Credentials on Windows Server 2012 R2 or later with HPC Pack (Microsoft MPI)

On Windows Server 2012 R2 and later with HPC Pack installed you can only use Microsoft MPI.

To register your credentials:

Confirm the user name and its associated domain under which you submit jobs. To do this:
1. On the head node of the cluster, open a command prompt window and run:
  whoami
After you know the domain and user name under which you run jobs, in the same command window, run:
hpccred setcreds
When prompted, enter the domain and user name under which you submit jobs. For example, windows\username.
Enter the password for this user name.