You can change the OLT mode to real-time display by clicking the Toggle realtime display toolbar
button ( ) or
by selecting File >
Preferences > OLT > Display > Display style Real-time. This display
shows events as they actually occurred in real time (as opposed to partial ordering, which
respects causal relationships but does not necessarily show events in chronological
order):
The default time scale (measured in microseconds) is designed to fit a reasonable number of events on a single screen. The jagged lines between events represent lapses in time, during which the call might be stepping through non-debuggable code or be caught in network traffic.
When viewing events in real time, be aware of the following issues:
Overlapping events
In real time, events can occur almost simultaneously. This means that event symbols and
connection arrows frequently overlap. You can adjust the time scale on the trace by
selecting File > Preferences > OLT > Display > Display Style,
and changing the number of microseconds per pixel. Note, however, that even when you set
the scale to its smallest interval (1 microsecond per pixel), events may still overlap.
Cumulative time
The clock starts at 0 when you first run your client application. If you run the
application again, the clock continues from the time reached on the first run, rather than
restarting at 0.
Synchronization
OLT performs clock synchronization between machines in order to avoid anomalies (for
example, a received call being drawn before a call). Thus, times shown on the real-time
scale may not match system clocks exactly. Also, if some events on the trace have been
collected with real-time information, and some have not, OLT will "fake" the
time for those that do not have real-time information.