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'\"
'\" Copyright (c) 1993 The Regents of the University of California.
'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
'\"
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\"
'\" RCS: @(#) $Id: time.n,v 1.5.12.1 2007/11/01 16:25:56 dgp Exp $
'\"
.so man.macros
.TH time n "" Tcl "Tcl Built-In Commands"
.BS
'\" Note: do not modify the .SH NAME line immediately below!
.SH NAME
time \- Time the execution of a script
.SH SYNOPSIS
\fBtime \fIscript\fR ?\fIcount\fR?
.BE
.SH DESCRIPTION
.PP
This command will call the Tcl interpreter \fIcount\fR
times to evaluate \fIscript\fR (or once if \fIcount\fR is not
specified). It will then return a string of the form
.CS
\fB503 microseconds per iteration\fR
.CE
which indicates the average amount of time required per iteration,
in microseconds.
Time is measured in elapsed time, not CPU time.
.SH EXAMPLE
Estimate how long it takes for a simple Tcl \fBfor\fR loop to count to
a thousand:
.CS
time {
for {set i 0} {$i<1000} {incr i} {
# empty body
}
}
.CE
.SH "SEE ALSO"
clock(n)
.SH KEYWORDS
script, time
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