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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

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