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<title>clGetEventProfilingInfo</title>
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<meta name="keywords" content=" &#10; clGetEventProfilingInfo&#10; " />
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<div class="refentry">
<a id="idm1"></a>
<div class="titlepage"></div>
<div xmlns="" class="refnamediv">
<a xmlns="http://www.w3.org/1999/xhtml" id="clGetEventProfilingInfo"></a>
<h1>
clGetEventProfilingInfo
</h1>
<p>
Returns profiling information for the command associated with event if profiling is enabled.
</p>
</div>
<div class="refsynopsisdiv">
<h2></h2>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="_top">cl_int</a>
<strong class="fsfunc">clGetEventProfilingInfo</strong>
(</code>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="_top">cl_event</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">event</var>, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_profiling_info" target="_top">cl_profiling_info</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">param_name</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">param_value_size</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">void</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*param_value</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*param_value_size_ret</var><code>)</code></td>
</tr>
</table>
</div>
</div>
<div class="refsect1">
<a id="parameters"></a>
<h2>Parameters</h2>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<code class="varname">event</code>
</span>
</dt>
<dd>
<p>Specifies the event object.</p>
</dd>
<dt>
<span class="term">
<code class="varname">param_name</code>
</span>
</dt>
<dd>
<p>Specifies the profiling data to query. The list of supported <code class="varname">param_name</code> types and the information returned in <code class="varname">param_value</code> by <code class="function">clGetEventProfilingInfo</code> is described in the table of parameter queries below.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">param_value_size</code>
</span>
</dt>
<dd>
<p>
Specifies the size in bytes of memory pointed to by <code class="varname">param_value</code>.
This size must be greater than or equal to the size of return type as described in the table bolow.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">param_value</code>
</span>
</dt>
<dd>
<p>
A pointer to memory where the appropriate result being queried is returned. If
<code class="varname">param_value</code> is NULL, it is ignored.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">param_value_size_ret</code>
</span>
</dt>
<dd>
<p>
Returns the actual size in bytes of data copied to <code class="varname">param_value</code>. If
<code class="varname">param_value_size_ret</code> is NULL, it is ignored.
</p>
</dd>
<dt></dt>
<dd>
<p>
The following is a table of <code class="function">clGetEventProfilingInfo</code> parameter queries
</p>
<div class="informaltable">
<table class="informaltable" border="1">
<colgroup>
<col align="left" class="col1" />
<col align="left" class="col2" />
<col align="left" class="col3" />
</colgroup>
<thead>
<tr>
<th align="left">cl_profiling_info</th>
<th align="left">Return Type</th>
<th align="left">Info. returned in <code class="varname">param_value</code></th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">
<code class="constant">CL_PROFILING_COMMAND_QUEUED</code>
</td>
<td align="left">cl_ulong</td>
<td align="left">
A 64-bit value that describes the current
device time counter in nanoseconds when
the command identified by <code class="varname">event</code> is
enqueued in a command-queue by the
host.
</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_PROFILING_COMMAND_SUBMIT</code>
</td>
<td align="left">cl_ulong</td>
<td align="left">
A 64-bit value that describes the current
device time counter in nanoseconds when
the command identified by <code class="varname">event</code> that has
been enqueued is submitted by the host to
the device associated with the commandqueue.
</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_PROFILING_COMMAND_START</code>
</td>
<td align="left">cl_ulong</td>
<td align="left">
A 64-bit value that describes the current
device time counter in nanoseconds when
the command identified by <code class="varname">event</code> starts
execution on the device.
</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_PROFILING_COMMAND_END</code>
</td>
<td align="left">cl_ulong</td>
<td align="left">
A 64-bit value that describes the current
device time counter in nanoseconds when
the command identified by <code class="varname">event</code> has
finished execution on the device.
</td>
</tr>
</tbody>
</table>
</div>
</dd>
</dl>
</div>
</div>
<div class="refsect1">
<a id="notes"></a>
<h2>Notes</h2>
<p>
The unsigned 64-bit values returned can be used to measure the time in nano-seconds consumed
by OpenCL commands.
</p>
<p>
OpenCL devices are required to correctly track time across changes in device frequency and
power states. The <code class="constant">CL_DEVICE_PROFILING_TIMER_RESOLUTION</code> specifies the resolution of
the timer i.e. the number of nanoseconds elapsed before the timer is incremented.
</p>
<p>
Event objects can be used to capture profiling information that measure execution time of a
command. Profiling of OpenCL commands can be enabled either by using a command-queue
created with CL_QUEUE_PROFILING_ENABLE flag set in <code class="varname">properties</code> argument to
<a class="citerefentry" href="clCreateCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clCreateCommandQueue</span></span></a> or by setting the CL_QUEUE_PROFILING_ENABLE flag in <code class="varname">properties</code> argument to <a class="citerefentry" href="clSetCommandQueueProperty.html"><span class="citerefentry"><span class="refentrytitle">clSetCommandQueueProperty</span></span></a>.
</p>
</div>
<div class="refsect1">
<a id="errors"></a>
<h2>Errors</h2>
<p>
<code class="function">clGetEventProfilingInfo</code> returns <span class="errorname">CL_SUCCESS</span> if the function is executed successfully and the profiling information has been recorded, returns <span class="errorname">CL_PROFILING_INFO_NOT_AVAILABLE</span> if the <span class="errorname">CL_QUEUE_PROFILING_ENABLE</span> flag is not set for the command-queue and if the profiling information is currently not available (because the command identified by <code class="varname">event</code> has not completed), returns <span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">param_name</code> is not valid, or if size in bytes
specified by <code class="varname">param_value_size</code> is less than the size of return type as described in the above table and <code class="varname">param_value</code> is not NULL, and returns <span class="errorname">CL_INVALID_EVENT</span> if <code class="varname">event</code> is a not a valid event object.
</p>
</div>
<div class="refsect1">
<a id="specification"></a>
<h2>Specification</h2>
<p>
<img src="pdficon_small1.gif" />
<a href="http://www.khronos.org/registry/cl/specs/opencl-1.0.pdf#page=123" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="clCreateCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clCreateCommandQueue</span></span></a>,
<a class="citerefentry" href="clSetCommandQueueProperty.html"><span class="citerefentry"><span class="refentrytitle">clSetCommandQueueProperty</span></span></a>
</p>
</div>
<div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2009 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a
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"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
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