## Chapter 13: CFX-Solver Start Methods

CFX-Solver Start Methods define allowable parameters and command-line arguments used by CFX-Solver Manager and CFX-Solver Script to launch the CFX-Solver executable and perform a run. The definition of the solver start methods are modifiable by expert users to customize solver start-up for specific parallel or batch queuing environments.

The standard start methods for a CFX installation are contained in the `<CFXROOT>/etc/start-methods.ccl` file. These can be over-ridden by placing a custom version of this file in the same location as the site or user CFX configuration files.

## Direct Start Methods

Solver start methods that directly run the CFX-Solver executable are known as Direct start methods, and are commonly used for defining solver execution in serial or parallel on local networks. The definitions of solver start methods for specific parallel environments can be made following the various available MPI methods in the file.

## Indirect Start Methods

Solver start methods can also be used to launch a user-defined script or program that can perform system interaction before re-executing a cfx5solve command under a different environment or system. These are known as indirect start methods, and are commonly used for executing CFX-Solver runs on remote or batch queuing systems. Use of Indirect start methods requires knowledge of a system scripting language (such as bash or Perl) to customize the solve start-up process for your specific environment. Currently the only supported indirect start method is the "Submit to Windows HPC Queue" method.

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