'\"
'\" Generated from file 'counter\&.man' by tcllib/doctools with format 'nroff'
'\"
.TH "counter" 3tcl 2\&.0\&.4 tcllib "Counters and Histograms"
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.SH NAME
counter \- Procedures for counters and histograms
.SH SYNOPSIS
package require \fBTcl  8\fR
.sp
package require \fBcounter  ?2\&.0\&.4?\fR
.sp
\fB::counter::init\fR \fItag args\fR
.sp
\fB::counter::count\fR \fItag\fR ?\fIdelta\fR? ?\fIinstance\fR?
.sp
\fB::counter::start\fR \fItag instance\fR
.sp
\fB::counter::stop\fR \fItag instance\fR
.sp
\fB::counter::get\fR \fItag args\fR
.sp
\fB::counter::exists\fR \fItag\fR
.sp
\fB::counter::names\fR
.sp
\fB::counter::histHtmlDisplay\fR \fItag args\fR
.sp
\fB::counter::reset\fR \fItag args\fR
.sp
.BE
.SH DESCRIPTION
.PP
The \fBcounter\fR package provides a counter facility and can
compute statistics and histograms over the collected data\&.
.TP
\fB::counter::init\fR \fItag args\fR
This defines a counter with the name \fItag\fR\&.  The \fIargs\fR
determines the characteristics of the counter\&.  The \fIargs\fR are
.RS
.TP
\fB-group\fR \fIname\fR
Keep a grouped counter where the name of the histogram bucket is
passed into \fB::counter::count\fR\&.
.TP
\fB-hist\fR \fIbucketsize\fR
Accumulate the counter into histogram buckets of size
\fIbucketsize\fR\&.  For example, if the samples are millisecond time
values and \fIbucketsize\fR is 10, then each histogram bucket
represents time values of 0 to 10 msec, 10 to 20 msec, 20 to 30 msec,
and so on\&.
.TP
\fB-hist2x\fR \fIbucketsize\fR
Accumulate the statistic into histogram buckets\&.  The size of the
first bucket is \fIbucketsize\fR, each other bucket holds values 2
times the size of the previous bucket\&.  For example, if
\fIbucketsize\fR is 10, then each histogram bucket represents time
values of 0 to 10 msec, 10 to 20 msec, 20 to 40 msec, 40 to 80 msec,
and so on\&.
.TP
\fB-hist10x\fR \fIbucketsize\fR
Accumulate the statistic into histogram buckets\&.  The size of the
first bucket is \fIbucketsize\fR, each other bucket holds values 10
times the size of the previous bucket\&.  For example, if
\fIbucketsize\fR is 10, then each histogram bucket represents time
values of 0 to 10 msec, 10 to 100 msec, 100 to 1000 msec, and so on\&.
.TP
\fB-lastn\fR \fIN\fR
Save the last \fIN\fR values of the counter to maintain a "running
average" over the last \fIN\fR values\&.
.TP
\fB-timehist\fR \fIsecsPerMinute\fR
Keep a time-based histogram\&.  The counter is summed into a histogram
bucket based on the current time\&.  There are 60 per-minute buckets
that have a size determined by \fIsecsPerMinute\fR, which is normally
60, but for testing purposes can be less\&.  Every "hour" (i\&.e\&., 60
"minutes") the contents of the per-minute buckets are summed into the
next hourly bucket\&.  Every 24 "hours" the contents of the per-hour
buckets are summed into the next daily bucket\&.  The counter package
keeps all time-based histograms in sync, so the first
\fIsecsPerMinute\fR value seen by the package is used for all
subsequent time-based histograms\&.
.RE
.TP
\fB::counter::count\fR \fItag\fR ?\fIdelta\fR? ?\fIinstance\fR?
Increment the counter identified by \fItag\fR\&.  The default increment
is 1, although you can increment by any value, integer or real, by
specifying \fIdelta\fR\&.  You must declare each counter with
\fB::counter::init\fR to define the characteristics of counter before
you start to use it\&.  If the counter type is \fB-group\fR, then the
counter identified by \fIinstance\fR is incremented\&.
.TP
\fB::counter::start\fR \fItag instance\fR
Record the starting time of an interval\&.  The \fItag\fR is the name of
the counter defined as a \fB-hist\fR value-based histogram\&.  The
\fIinstance\fR is used to distinguish this interval from any other
intervals that might be overlapping this one\&.
.TP
\fB::counter::stop\fR \fItag instance\fR
Record the ending time of an interval\&.  The delta time since the
corresponding \fB::counter::start\fR call for \fIinstance\fR is
recorded in the histogram identified by \fItag\fR\&.
.TP
\fB::counter::get\fR \fItag args\fR
Return statistics about a counter identified by \fItag\fR\&.  The
\fIargs\fR determine what value to return:
.RS
.TP
\fB-total\fR
Return the total value of the counter\&.  This is the default if
\fIargs\fR is not specified\&.
.TP
\fB-totalVar\fR
Return the name of the total variable\&.  Useful for specifying with
-textvariable in a Tk widget\&.
.TP
\fB-N\fR
Return the number of samples accumulated into the counter\&.
.TP
\fB-avg\fR
Return the average of samples accumulated into the counter\&.
.TP
\fB-avgn\fR
Return the average over the last \fIN\fR samples taken\&.  The \fIN\fR
value is set in the \fB::counter::init\fR call\&.
.TP
\fB-hist\fR \fIbucket\fR
If \fIbucket\fR is specified, then the value in that bucket of the
histogram is returned\&.  Otherwise the complete histogram is returned
in array get format sorted by bucket\&.
.TP
\fB-histVar\fR
Return the name of the histogram array variable\&.
.TP
\fB-histHour\fR
Return the complete hourly histogram in array get format sorted by
bucket\&.
.TP
\fB-histHourVar\fR
Return the name of the hourly histogram array variable\&.
.TP
\fB-histDay\fR
Return the complete daily histogram in array get format sorted by
bucket\&.
.TP
\fB-histDayVar\fR
Return the name of the daily histogram array variable\&.
.TP
\fB-resetDate\fR
Return the clock seconds value recorded when the
counter was last reset\&.
.TP
\fB-all\fR
Return an array get of the array used to store the counter\&.  This
includes the total, the number of samples (N), and any type-specific
information\&.  This does not include the histogram array\&.
.RE
.TP
\fB::counter::exists\fR \fItag\fR
Returns 1 if the counter is defined\&.
.TP
\fB::counter::names\fR
Returns a list of all counters defined\&.
.TP
\fB::counter::histHtmlDisplay\fR \fItag args\fR
Generate HTML to display a histogram for a counter\&.  The \fIargs\fR
control the format of the display\&.  They are:
.RS
.TP
\fB-title\fR \fIstring\fR
Label to display above bar chart
.TP
\fB-unit\fR \fIunit\fR
Specify \fBminutes\fR, \fBhours\fR, or \fBdays\fR for the
time-base histograms\&.  For value-based histograms, the \fIunit\fR is
used in the title\&.
.TP
\fB-images\fR \fIurl\fR
URL of /images directory\&.
.TP
\fB-gif\fR \fIfilename\fR
Image for normal histogram bars\&.  The \fIfilename\fR is relative to
the \fB-images\fR directory\&.
.TP
\fB-ongif\fR \fIfilename\fR
Image for the active histogram bar\&.  The \fIfilename\fR is relative to
the \fB-images\fR directory\&.
.TP
\fB-max\fR \fIN\fR
Maximum number of value-based buckets to display\&.
.TP
\fB-height\fR \fIN\fR
Pixel height of the highest bar\&.
.TP
\fB-width\fR \fIN\fR
Pixel width of each bar\&.
.TP
\fB-skip\fR \fIN\fR
Buckets to skip when labeling value-based histograms\&.
.TP
\fB-format\fR \fIstring\fR
Format used to display labels of buckets\&.
.TP
\fB-text\fR \fIboolean\fR
If 1, a text version of the histogram is dumped, otherwise a graphical
one is generated\&.
.RE
.TP
\fB::counter::reset\fR \fItag args\fR
Resets the counter with the name \fItag\fR to an initial state\&. The
\fIargs\fR determine the new characteristics of the counter\&. They have
the same meaning as described for \fB::counter::init\fR\&.
.PP
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report such in the category \fIcounter\fR of the
\fITcllib Trackers\fR [http://core\&.tcl\&.tk/tcllib/reportlist]\&.
Please also report any ideas for enhancements you may have for either
package and/or documentation\&.
.SH KEYWORDS
counting, histogram, statistics, tallying
.SH CATEGORY
Data structures