Realtime DTrace Analysis

A collection of scripts used for realtime DTrace visualizations and analysis

Stream gnuplot

stream-gnuplot.sh is a script that reads from stdin to generate live gnuplot graphs. It takes input in the form of:

<epoch> <y-axis>\n

The DTrace scripts provided will output in this format, so they can be piped into stream-gnuplot.sh.

Examples

Syscall Latency/Count Visualization

Visualize syscall latency or counts using gnuplot. An example of this can be seen here http://www.youtube.com/watch?v=PnvszdcUgJc

$ sudo ./syscall-latency.d 'read*' | ./stream-gnulpot.sh

  20 ++------+-------+------+-------+-------+-------+------+-------+------++
     +       +       +      +       + "-" using (\$1):(\$2/1000/1000)+****** +
  18 ++                                                    *              ++
  16 ++                                                   * *             ++
     |                                                    * *              |
  14 ++                                                  *   *            ++
     |                                                   *   *             |
  12 ++                                                 *     *           ++
  10 ++                                                 *      *          ++
     |                              **                 *       *           |
   8 ++                           **  **               *        *         ++
     |                           *      *             *          *         |
   6 ++                         *        *            *          *        ++
     |                        **          **         *            *        |
   4 ++                      *                       *            *       ++
   2 ************************               *********              ********+
     +       +       +      +       +       +       +      +       +       *
   0 ++------+-------+------+-------+-------+-------+------+-------+------++
   11:02   11:03   11:04  11:05   11:06   11:07   11:08  11:09   11:10   11:11
                                 Time (Seconds)

License

BSD 3 Clause. See LICENSE for details.