debug_heartbeat man page

debug::heartbeat — debug narrative — heartbeat


package require Tcl 8.5

package require debug::heartbeat ?1?

package require debug ?1?

debug heartbeat ?delta?


debug heartbeat ?delta?
This method activates or disables a heartbeat with which to monitor the event loop of an event-based Tcl application.

It reserves the debug tag heartbeat for its operation and writes a message every delta milliseconds.

A delta-value <= 0 disables the heartbeat.

The message produced by the heartbeat contains a sequence counter and the time in milliseconds since the last beat, thus providing insight into timing variationsn and deviations from the nominal delta.

Bugs, Ideas, Feedback

This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category debug of the Tcllib Trackers [http://core.tcl.tk/tcllib/reportlist]. Please also report any ideas for enhancements you may have for either package and/or documentation.


debug, heartbeat, log, narrative, trace


debugging, tracing, and logging


tcllib debug narrative