*time-threshold*

The value of this variable can be nil or a positive number. If it is a positive number, then evaluations which take longer than that number of seconds will have a time report (such as printed by the time macro) printed along with the value of the evaluation.

cl-user(1): (setq top-level:*time-threshold* 5.0)
5.0
cl-user(2): (sleep 4)
nil
cl-user(3): (sleep 5.5)
; cpu time (non-gc) 0 msec user, 0 msec system
; cpu time (gc)     0 msec user, 0 msec system
; cpu time (total)  0 msec user, 0 msec system
; real time  5,495 msec
; space allocation:
;  4 cons cells, 32 other bytes, 0 static bytes
nil
cl-user(4): 

See top-level.htm for more information on the top level. See particularly Automatic timing information in that document.

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Created 2010.1.21.