This section describes the commands that relate to I/O activity.
Write the report of all I/O activity, sorted by file.
Write the report of all I/O activity, sorted by virtual file descriptor. A different virtual file descriptor is generated for each open of a file, even if the same file descriptor is returned from the open.
Write the report of all I/O activity, sorted by callstack, and aggregated over all events with the same callstack. For each aggregated callstack, include the callstack trace.
Write summary statistics for all I/O activity.