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    <title>clGetEventProfilingInfo</title>
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    <div class="refentry">
      <a id="id-1"></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 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 command-queue.
                                    </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>.
        </p>
      </div>
      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <p>Returns <span class="errorname">CL_SUCCESS</span> if the function is executed successfully and the profiling information has been recorded. Otherwise, it returns one of the following errors:
        </p>
        <div class="itemizedlist">
          <ul class="itemizedlist" style="list-style-type: disc; ">
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_PROFILING_INFO_NOT_AVAILABLE</span> if the CL_QUEUE_PROFILING_ENABLE 
                flag is not set for the command-queue, if the execution status of the command identified 
                by <code class="varname">event</code> is not CL_COMPLETE or if <code class="varname">event</code> is a user event 
                object.
            </li>
            <li class="listitem" style="list-style-type: disc"><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.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_EVENT</span> if <code class="varname">event</code> is a not a valid event object.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_RESOURCES</span> if there is a failure to allocate resources required 
                by the OpenCL implementation on the device.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_HOST_MEMORY</span> if there is a failure to allocate resources required 
                by the OpenCL implementation on the host.
            </li>
          </ul>
        </div>
      </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-1.1.pdf#page=151" 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 © 2007-2010 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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