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<HTML>
<HEAD>
<TITLE>Win32::PerfLib - accessing the Windows NT Performance Counter</TITLE>
<LINK REL="stylesheet" HREF="../../../Active.css" TYPE="text/css">
<LINK REV="made" HREF="mailto:">
</HEAD>
<BODY>
<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%>
<TR><TD CLASS=block VALIGN=MIDDLE WIDTH=100% BGCOLOR="#cccccc">
<STRONG><P CLASS=block> Win32::PerfLib - accessing the Windows NT Performance Counter</P></STRONG>
</TD></TR>
</TABLE>
<A NAME="__index__"></A>
<!-- INDEX BEGIN -->
<UL>
<LI><A HREF="#name">NAME</A></LI><LI><A HREF="#supportedplatforms">SUPPORTED PLATFORMS</A></LI>
<LI><A HREF="#synopsis">SYNOPSIS</A></LI>
<LI><A HREF="#description">DESCRIPTION</A></LI>
<LI><A HREF="#functions">FUNCTIONS</A></LI>
<UL>
<LI><A HREF="#note">NOTE</A></LI>
</UL>
<LI><A HREF="#datastructures">Datastructures</A></LI>
<LI><A HREF="#author">AUTHOR</A></LI>
<LI><A HREF="#see also">SEE ALSO</A></LI>
</UL>
<!-- INDEX END -->
<HR>
<P>
<H1><A NAME="name">NAME</A></H1>
<P>Win32::PerfLib - accessing the Windows NT Performance Counter</P>
<P>
<HR>
<H1><A NAME="supportedplatforms">SUPPORTED PLATFORMS</A></H1>
<UL>
<LI>Windows</LI>
</UL>
<HR>
<H1><A NAME="synopsis">SYNOPSIS</A></H1>
<PRE>
use Win32::PerfLib;
my $server = "";
Win32::PerfLib::GetCounterNames($server, \%counter);
%r_counter = map { $counter{$_} => $_ } keys %counter;
# retrieve the id for process object
$process_obj = $r_counter{Process};
# retrieve the id for the process ID counter
$process_id = $r_counter{'ID Process'};</PRE>
<PRE>
# create connection to $server
$perflib = new Win32::PerfLib($server);
$proc_ref = {};
# get the performance data for the process object
$perflib->GetObjectList($process_obj, $proc_ref);
$perflib->Close();
$instance_ref = $proc_ref->{Objects}->{$process_obj}->{Instances};
foreach $p (sort keys %{$instance_ref})
{
$counter_ref = $instance_ref->{$p}->{Counters};
foreach $i (keys %{$counter_ref})
{
if($counter_ref->{$i}->{CounterNameTitleIndex} == $process_id)
{
printf( "% 6d %s\n", $counter_ref->{$i}->{Counter},
$instance_ref->{$p}->{Name}
);
}
}
}</PRE>
<P>
<HR>
<H1><A NAME="description">DESCRIPTION</A></H1>
<P>This module allows to retrieve the performance counter of any computer
(running Windows NT) in the network.</P>
<P>
<HR>
<H1><A NAME="functions">FUNCTIONS</A></H1>
<P>
<H2><A NAME="note">NOTE</A></H2>
<P>All of the functions return FALSE (0) if they fail, unless otherwise noted.
If the $server argument is undef the local machine is assumed.</P>
<DL>
<DT><STRONG><A NAME="item_GetCounterNames">Win32::PerfLib::GetCounterNames($server,$hashref)</A></STRONG><BR>
<DD>
Retrieves the counter names and their indices from the registry and stores them
in the hash reference
<P></P>
<DT><STRONG><A NAME="item_GetCounterHelp">Win32::PerfLib::GetCounterHelp($server,$hashref)</A></STRONG><BR>
<DD>
Retrieves the counter help strings and their indices from the registry and
stores them in the hash reference
<P></P>
<DT><STRONG><A NAME="item_new">$perflib = Win32::PerfLib->new ($server)</A></STRONG><BR>
<DD>
Creates a connection to the performance counters of the given server
<P></P>
<DT><STRONG><A NAME="item_GetObjectList">$perflib-><CODE>GetObjectList($objectid,$hashref)</CODE></A></STRONG><BR>
<DD>
retrieves the object and counter list of the given performance object.
<P></P>
<DT><STRONG><A NAME="item_Close">$perflib-><CODE>Close($hashref)</CODE></A></STRONG><BR>
<DD>
closes the connection to the performance counters
<P></P>
<DT><STRONG><A NAME="item_GetCounterType">Win32::PerfLib::GetCounterType(countertype)</A></STRONG><BR>
<DD>
converts the counter type to readable string as referenced in <EM>calc.html</EM> so
that it is easier to find the appropriate formula to calculate the raw counter
data.
<P></P></DL>
<P>
<HR>
<H1><A NAME="datastructures">Datastructures</A></H1>
<P>The performance data is returned in the following data structure:</P>
<DL>
<DT><STRONG><A NAME="item_Level_1">Level 1</A></STRONG><BR>
<DD>
<PRE>
$hashref = {
'NumObjectTypes' => VALUE
'Objects' => HASHREF
'PerfFreq' => VALUE
'PerfTime' => VALUE
'PerfTime100nSec' => VALUE
'SystemName' => STRING
'SystemTime' => VALUE
}</PRE>
<DT><STRONG><A NAME="item_Level_2">Level 2</A></STRONG><BR>
<DD>
The hash reference $hashref->{Objects} has the returned object <CODE>ID(s)</CODE> as keys and
a hash reference to the object counter data as value. Even there is only one
object requested in the call to GetObjectList there may be more than one object
in the result.
<PRE>
$hashref->{Objects} = {
<object1> => HASHREF
<object2> => HASHREF
...
}</PRE>
<P></P>
<DT><STRONG><A NAME="item_Level_3">Level 3</A></STRONG><BR>
<DD>
Each returned object ID has object-specific performance information. If an
object has instances like the process object there is also a reference to
the instance information.
<PRE>
$hashref->{Objects}->{<object1>} = {
'DetailLevel' => VALUE
'Instances' => HASHREF
'Counters' => HASHREF
'NumCounters' => VALUE
'NumInstances' => VALUE
'ObjectHelpTitleIndex' => VALUE
'ObjectNameTitleIndex' => VALUE
'PerfFreq' => VALUE
'PerfTime' => VALUE
}</PRE>
<P></P>
<DT><STRONG><A NAME="item_Level_4">Level 4</A></STRONG><BR>
<DD>
If there are instance information for the object available they are stored in
the 'Instances' hashref. If the object has no instances there is an 'Counters'
key instead. The instances or counters are numbered.
<PRE>
$hashref->{Objects}->{<object1>}->{Instances} = {
<1> => HASHREF
<2> => HASHREF
...
<n> => HASHREF
}
or
$hashref->{Objects}->{<object1>}->{Counters} = {
<1> => HASHREF
<2> => HASHREF
...
<n> => HASHREF
}</PRE>
<P></P>
<DT><STRONG><A NAME="item_Level_5">Level 5</A></STRONG><BR>
<DD>
<PRE>
$hashref->{Objects}->{<object1>}->{Instances}->{<1>} = {
Counters => HASHREF
Name => STRING
ParentObjectInstance => VALUE
ParentObjectTitleIndex => VALUE
}
or
$hashref->{Objects}->{<object1>}->{Counters}->{<1>} = {
Counter => VALUE
CounterHelpTitleIndex => VALUE
CounterNameTitleIndex => VALUE
CounterSize => VALUE
CounterType => VALUE
DefaultScale => VALUE
DetailLevel => VALUE
Display => STRING
}</PRE>
<DT><STRONG><A NAME="item_Level_6">Level 6</A></STRONG><BR>
<DD>
<PRE>
$hashref->{Objects}->{<object1>}->{Instances}->{<1>}->{Counters} = {
<1> => HASHREF
<2> => HASHREF
...
<n> => HASHREF
}</PRE>
<DT><STRONG><A NAME="item_Level_7">Level 7</A></STRONG><BR>
<DD>
<PRE>
$hashref->{Objects}->{<object1>}->{Instances}->{<1>}->{Counters}->{<1>} = {
Counter => VALUE
CounterHelpTitleIndex => VALUE
CounterNameTitleIndex => VALUE
CounterSize => VALUE
CounterType => VALUE
DefaultScale => VALUE
DetailLevel => VALUE
Display => STRING
}</PRE>
<P>Depending on the <STRONG>CounterType</STRONG> there are calculations to do (see calc.html).</P>
</DL>
<P>
<HR>
<H1><A NAME="author">AUTHOR</A></H1>
<P>Jutta M. Klebe, <A HREF="mailto:jmk@bybyte.de">jmk@bybyte.de</A></P>
<P>
<HR>
<H1><A NAME="see also">SEE ALSO</A></H1>
<P>perl(1).</P>
<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%>
<TR><TD CLASS=block VALIGN=MIDDLE WIDTH=100% BGCOLOR="#cccccc">
<STRONG><P CLASS=block> Win32::PerfLib - accessing the Windows NT Performance Counter</P></STRONG>
</TD></TR>
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