Note that rtpm depends on the kernel metrics information in the file /var/adm/metreg.data. If there has been a system configuration change since the last time metreg was run that renders the data invalid, an error message like the following is displayed by rtpm:
mas_open: MAS_SANITY nlocks corrupted.To correct the problem, run the metreg command. See the metreg(F) manual page for a description of the information initialized by metreg.