To really understand what’s going on in a Windows NT
network, you need a baseline measurement of how the system functions.
Performance Monitor is the best tool for this job.

We recently offered an overview of
Windows NT’s Performance Monitor
and discussed which counters offer the
most information about your systems. Now, let’s take a look at how you can take
advantage of this handy tool by creating—and examining—a log file.

To create a log file, follow these steps:

  1. Go to
    Start | Programs | Administrative Tools (Common) | Performance Monitor.
  2. From
    the View menu, select Log.
  3. From
    the Edit menu, select Add To Log.
  4. In the
    Add To Log dialog box, specify the name of the computer you want to log in
    the Computer field.
  5. In the
    Objects list box, select the counters you want to log, and click Add.
  6. From
    the Options menu, select Log.
  7. In the
    Log Options dialog box, specify a filename in the File Name field.
  8. In the
    Update Time section, specify the desired interval. (Sixty seconds is a
    pretty good indicator.). Keep in mind that the smaller the interval, the
    larger the log.
  9. Click the
    Start Log button.

When you’re ready to stop monitoring and examine the log
file, follow these steps:

  1. From
    the Options menu, select Log.
  2. Click the
    Stop Log button.
  3. From
    the Options menu, select Data From.
  4. In the
    Data From dialog box, select the Log File option.
  5. Select
    the Perfmon.log option, and browse to the log file. (Note: Choosing File |
    Open won’t open log files.)
  6. Click
    Open, and click OK.
  7. When
    the log file opens, use the Add Counter button to add the objects and
    counters that you monitored. Do this for each view needed (i.e., Chart, Alert,
    Log, and/or Report); otherwise, the log file’s data won’t be available.