/usr/bin/fi_mon_sampler: invalid option -- '-'
Sampler for ofi_hook_monitor provider

Usage:
  /usr/bin/fi_mon_sampler [OPTIONS] <file>	start sampler on ofi_hook_monitor output file <file>

Options:
 -w <msec>            watch file for changes, wait <msec> milliseconds between checks
 -f <format>          output format (CSV)
 -o <outpath>         output file (stdout if unset)