# Arguments¶

The ramp fitting step has three optional arguments that can be set by the user:

• --save_opt: A True/False value that specifies whether to write the optional output product. Default if False.

• --opt_name: A string that can be used to override the default name for the optional output product.

• --int_name: A string that can be used to override the default name for the per-integration product.

• --maximum_cores: The fraction of available cores that will be used for multi-processing in this step. The default value is ‘none’ which does not use multi-processing. The other options are ‘quarter’, ‘half’, and ‘all’. Note that these fractions refer to the total available cores and on most CPUs these include physical and virtual cores. The clock time for the step is reduced almost linearly by the number of physical cores used on all machines. For example, on an Intel CPU with six real cores and 6 virtual cores setting maximum_cores to ‘half’ results in a decrease of a factor of six in the clock time for the step to run. Depending on the system the clock time can also decrease even more with maximum_cores is set to ‘all’.