time(n) Tcl Built-In Commands time(n) 







time - Time the execution of a script








time script ?count?












This command will call the Tcl interpreter count times to
    evaluate script (or once if count is not specified). It will
    then return a string of the form




503 microseconds per iteration



which indicates the average amount of time required per iteration, in
  microseconds. Time is measured in elapsed time, not CPU time.







Estimate how long it takes for a simple Tcl for loop to
    count to a thousand:




time {
    for {set i 0} {$i<1000} {incr i} {
        # empty body
    }
}












clock(n)










script, time







  

    
    Tcl