PLOCKSTAT(1) PLOCKSTAT(1) NAME plockstat - front-end to DTrace to print statistics about POSIX mutexes and read/write locks SYNOPSIS plockstat [-vACHV] [-n count] [-s depth] [-e secs] [-x opt[=val]] command [arg...] plockstat [-vACHV] [-n count] [-s depth] [-e secs] [-x opt[=val]] -p pid OVERVIEW The plockstat command is a front-end to DTrace that can be used to print statistics about POSIX mutexes and read/write locks. Since OS X 10.11, in order to use this, your process must be run with DYLD_LIBRARY_PATH set to contain /usr/lib/system/introspection: DYLD_LIBRARY_PATH=/usr/lib/system/introspection Which contains the necessary static DTrace probes. OPTIONS -v print a message when tracing starts -A trace contention and hold events (same as -CH) -C trace contention events for mutexes and rwlocks -H trace hold events for mutexes and rwlocks -V print the dtrace script to run -n count display only 'count' entries for each event type -s depth show stack trace upto 'depth' entries -e secs exit after specified seconds -x arg[=val] enable a DTrace runtime option or a D compiler option -p pid attach and trace the specified process id SEE ALSO dtrace(1) 1.0 July 2007 PLOCKSTAT(1)