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Demonstrations of ustat. ustat is a "top"-like tool for monitoring events in high-level languages. It prints statistics about garbage collections, method calls, object allocations, and various other events for every process that it recognizes with a Java, Node, Perl, PHP, Python, Ruby, and Tcl runtime. For example: # ./ustat.py Tracing... Output every 10 secs. Hit Ctrl-C to end 12:17:17 loadavg: 0.33 0.08 0.02 5/211 26284 PID CMDLINE METHOD/s GC/s OBJNEW/s CLOAD/s EXC/s THR/s 3018 node/node 0 3 0 0 0 0 ^C Detaching... If desired, you can instruct ustat to print a certain number of entries and exit, which can be useful to get a quick picture on what's happening on the system over a short time interval. Here, we ask ustat to print 5-second summaries 12 times (for a total time of 1 minute): # ./ustat.py -C 5 12 Tracing... Output every 5 secs. Hit Ctrl-C to end 12:18:26 loadavg: 0.27 0.11 0.04 2/336 26455 PID CMDLINE METHOD/s GC/s OBJNEW/s CLOAD/s EXC/s THR/s 3018 node/node 0 1 0 0 0 0 12:18:31 loadavg: 0.33 0.12 0.04 2/336 26456 PID CMDLINE METHOD/s GC/s OBJNEW/s CLOAD/s EXC/s THR/s 3018 node/node 0 0 0 0 0 0 26439 java -XX:+ExtendedDT 2776045 0 0 0 0 0 12:18:37 loadavg: 0.38 0.14 0.05 2/336 26457 PID CMDLINE METHOD/s GC/s OBJNEW/s CLOAD/s EXC/s THR/s 3018 node/node 0 0 0 0 0 0 26439 java -XX:+ExtendedDT 2804378 0 0 0 0 0 (...more output omitted for brevity) USAGE message: # ./ustat.py -h usage: ustat.py [-h] [-l {java,node,perl,php,python,ruby,tcl}] [-C] [-S {cload,excp,gc,method,objnew,thread}] [-r MAXROWS] [-d] [interval] [count] Activity stats from high-level languages. positional arguments: interval output interval, in seconds count number of outputs optional arguments: -h, --help show this help message and exit -l {java,node,perl,php,python,ruby,tcl}, --language {java,node,perl,php,python,ruby,tcl} language to trace (default: all languages) -C, --noclear don't clear the screen -S {cload,excp,gc,method,objnew,thread}, --sort {cload,excp,gc,method,objnew,thread} sort by this field (descending order) -r MAXROWS, --maxrows MAXROWS maximum rows to print, default 20 -d, --debug Print the resulting BPF program (for debugging purposes) examples: ./ustat # stats for all languages, 1 second refresh ./ustat -C # don't clear the screen ./ustat -l java # Java processes only ./ustat 5 # 5 second summaries ./ustat 5 10 # 5 second summaries, 10 times only