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<h1>dmxstat.c File Reference</h1><code>#include "<a class="el" href="dmx_8h-source.html">dmx.h</a>"</code><br>
<code>#include "<a class="el" href="dmxstat_8h-source.html">dmxstat.h</a>"</code><br>
<code>#include "<a class="el" href="dmxlog_8h-source.html">dmxlog.h</a>"</code><br>
<code>#include "Xos.h"</code><br>
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<tr><td colspan=2><br><h2>Data Structures</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>struct </td><td class="memItemRight" valign=bottom><a class="el" href="struct__DMXStatAvg.html">_DMXStatAvg</a></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>struct </td><td class="memItemRight" valign=bottom><a class="el" href="struct__DMXStatInfo.html">_DMXStatInfo</a></td></tr>
<tr><td colspan=2><br><h2>Typedefs</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>typedef <a class="el" href="struct__DMXStatAvg.html">_DMXStatAvg</a> </td><td class="memItemRight" valign=bottom><a class="el" href="dmxstat_8c.html#a0">DMXStatAvg</a></td></tr>
<tr><td colspan=2><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="dmxstat_8c.html#a6">dmxStatActivate</a> (const char *interval, const char *displays)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="el" href="struct__DMXStatInfo.html">DMXStatInfo</a> * </td><td class="memItemRight" valign=bottom><a class="el" href="dmxstat_8c.html#a7">dmxStatAlloc</a> (void)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="dmxstat_8c.html#a8">dmxStatFree</a> (<a class="el" href="struct__DMXStatInfo.html">DMXStatInfo</a> *pt)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="dmxstat_8c.html#a10">dmxStatSync</a> (<a class="el" href="struct__DMXScreenInfo.html">DMXScreenInfo</a> *dmxScreen, struct timeval *stop, struct timeval *start, unsigned long pending)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="dmxstat_8c.html#a12">dmxStatInit</a> (void)</td></tr>
<tr><td colspan=2><br><h2>Variables</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>int </td><td class="memItemRight" valign=bottom><a class="el" href="dmxstat_8c.html#a1">dmxStatInterval</a></td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
The DMX server code is written to call <a class="el" href="dmxsync_8c.html#a9">dmxSync()</a> whenever an XSync() might be necessary. However, since XSync() requires a two way communication with the other X server, eliminating unnecessary XSync() calls is a key performance optimization. Support for this optimization is provided in #dmxsync.c. This file provides routines that evaluate this optimization by counting the number of XSync() calls and monitoring their latency. This functionality can be turned on using the -stat command-line parameter.<hr><h2>Typedef Documentation</h2>
<a class="anchor" name="a0" doxytag="dmxstat.c::DMXStatAvg" ></a><p>
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<td class="md" nowrap valign="top"> typedef struct <a class="el" href="struct__DMXStatAvg.html">_DMXStatAvg</a> <a class="el" href="struct__DMXStatAvg.html">DMXStatAvg</a>
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Used to compute a running average of value. </td>
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<hr><h2>Function Documentation</h2>
<a class="anchor" name="a6" doxytag="dmxstat.c::dmxStatActivate" ></a><p>
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<td class="md" nowrap valign="top"> void dmxStatActivate </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const char * </td>
<td class="mdname" nowrap> <em>interval</em>, </td>
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<td class="md" nowrap>const char * </td>
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<td class="md">) </td>
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Turn on XSync statistic gathering and printing. Print every <em>interval</em> seconds, with lines for the first <em>displays</em>. If <em>interval</em> is NULL, 1 will be used. If <em>displays</em> is NULL, 0 will be used (meaning a line for every display will be printed). Note that this function takes string arguments because it will usually be called from <a class="el" href="dmxinit_8c.html#a40">ddxProcessArgument</a> in #dmxinit.c. </td>
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<td class="md" nowrap valign="top"> <a class="el" href="struct__DMXStatInfo.html">DMXStatInfo</a>* dmxStatAlloc </td>
<td class="md" valign="top">( </td>
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Allocate a <em>DMXStatInfo</em> structure. </td>
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<a class="anchor" name="a8" doxytag="dmxstat.c::dmxStatFree" ></a><p>
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<td class="md" nowrap valign="top"> void dmxStatFree </td>
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Free the memory used by a <em>DMXStatInfo</em> structure. </td>
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<a class="anchor" name="a12" doxytag="dmxstat.c::dmxStatInit" ></a><p>
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<td class="md" nowrap valign="top"> void dmxStatInit </td>
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Try to initialize the statistic gathering and printing routines. Initialization only takes place if <a class="el" href="dmxstat_8h.html#a6">dmxStatActivate</a> has already been called. We don't need the same generation protection that we used in dmxSyncInit because our timer is always on a queue -- hence, server generation will always free it. </td>
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<a class="anchor" name="a10" doxytag="dmxstat.c::dmxStatSync" ></a><p>
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<td class="md" nowrap valign="top"> void dmxStatSync </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="struct__DMXScreenInfo.html">DMXScreenInfo</a> * </td>
<td class="mdname" nowrap> <em>dmxScreen</em>, </td>
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<td class="md" nowrap>struct timeval * </td>
<td class="mdname" nowrap> <em>stop</em>, </td>
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<td class="md" nowrap>struct timeval * </td>
<td class="mdname" nowrap> <em>start</em>, </td>
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<td class="md" nowrap>unsigned long </td>
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<td class="md">) </td>
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Note that a XSync() was just done on <em>dmxScreen</em> with the <em>start</em> and <em>stop</em> times (from gettimeofday()) and the number of pending-but-not-yet-processed XSync requests. This routine is called from #dmxDoSync in #dmxsync.c </td>
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<hr><h2>Variable Documentation</h2>
<a class="anchor" name="a1" doxytag="dmxstat.c::dmxStatInterval" ></a><p>
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<td class="md" nowrap valign="top"> int <a class="el" href="dmxstat_8h.html#a5">dmxStatInterval</a>
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Only for <a class="el" href="dmxstat_8c.html">dmxstat.c</a> and <a class="el" href="dmxsync_8c.html">dmxsync.c</a> </td>
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href="http://dmx.sourceforge.net">Distributed Multihead X</a> by
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