-d directory-name

Place the experiment in directory directory-name. This option only applies to individual experiments and not to experiment groups. If the directory does not exist, the collect utility prints an error message and exits. If a group is specified with the -g option, the group file is also written to directory-name.

For the lightest-weight data collection, it is best to record data to a local file, using the -d option to specify a directory in which to put the data. However, for MPI experiments on a cluster, the founder experiment must be available at the same path for all processes to have all data recorded into the founder experiment.

Experiments written to long-latency file systems are especially problematic, and might progress very slowly, especially if Sample data is collected (-S on option, the default). If you must record over a long-latency connection, disable Sample data.