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    <title>clGetKernelSubGroupInfo</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="clGetKernelSubGroupInfo"></a>
        <h1>
            clGetKernelSubGroupInfo
        </h1>
        <p>
            Returns information about the kernel object.
        </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="pagedisplay">cl_int</a>
                    <strong class="fsfunc">clGetKernelSubGroupInfo</strong>
                (</code>
                <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_kernel</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">kernel</var>
                , </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_device_id</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">device</var>
                , </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_kernel_sub_group_info" target="pagedisplay">cl_kernel_sub_group_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="pagedisplay">size_t</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">input_value_size</var>
                , </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*input_value</var>
                , </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">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="pagedisplay">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="pagedisplay">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"> kernel </code> </span>
            </dt>
            <dd>
              <p>
                        Specifies the kernel object being queried.
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname"> device </code> </span>
            </dt>
            <dd>
              <p>
                      Identifies a specific device in the list of devices associated with
                      <code class="varname">kernel</code>. The list of devices is the list of devices in
                      the OpenCL context that is associated with <code class="varname">kernel</code>. If
                      the list of devices associated with <code class="varname">kernel</code> is a single
                      device, <code class="varname">device</code> can be a NULL value.
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname"> param_name </code> </span>
            </dt>
            <dd>
              <p>
                      Specifies the information 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">clGetKernelSubGroupInfo</code> is described in the table
                      below.
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname">input_value_size</code> </span>
            </dt>
            <dd>
              <p>
                      Specifies the size in bytes of memory pointed to by 
                        <code class="varname">input_value</code>. This 
                        size must be == size of input type as described in table below. 
                    </p>
            </dd>
            <dt>
              <span class="term"> <code class="varname">input_value</code> </span>
            </dt>
            <dd>
              <p>
                        A pointer to memory where the appropriate parameterization of the query is passed from.
                        If <code class="varname">input_value</code> is NULL, it is ignored.
                    </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 </code> </span>
            </dt>
            <dd>
              <p>
                      Used to specify the size in bytes of memory pointed to by
                      <code class="varname">param_value</code>. This size must be ≥ size of return
                      type as described in the table below.
                    </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>
              <div class="informaltable">
                <table border="1">
                  <colgroup>
                    <col align="left" class="col1" />
                    <col align="left" class="col2" />
                    <col align="left" class="col3" />
                    <col />
                  </colgroup>
                  <thead>
                    <tr>
                      <th align="left">cl_kernel_sub_group_info</th>
                      <th align="left">Input Type</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_KERNEL_MAX_SUB_-
GROUP_SIZE_FOR_NDRANGE</code>
                      </td>
                      <td align="left">size_t *</td>
                      <td align="left">size_t</td>
                      <td align="left">
                            <p>
                                Returns the maximum sub-group size 
                                for this kernel. All subgroups must be 
                                the same size, while the last sub-group 
                                in any work-group (i.e. the sub-group 
                                with the maximum index) could be the 
                                same or smaller size.
                            </p>

                            <p>
                                The <code class="varname">input_value</code> must be an array of 
                                <span class="type">size_t</span> values corresponding to the 
                                local work size parameter of the 
                                intended dispatch. The number of
                                dimensions in the ND-range will be 
                                inferred from the value specified for 
                                <code class="varname">input_value_size</code>.
                            </p>
                        </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_KERNEL_SUB_GROUP_-
COUNT_FOR_NDRANGE</code>
                      </td>
                      <td align="left">size_t *</td>
                      <td align="left">size_t</td>
                      <td align="left">
                            <p>
                                Returns the number of sub-groups that
                                will be present in each work-group for 
                                a given local work size. All workgroups, 
                                apart from the last work-group 
                                in each dimension in the presence of 
                                non-uniform work-group sizes, will 
                                have the same number of subgroups.
                            </p>

                            <p>
                                The <code class="varname">input_value</code> must be an array of 
                                <span class="type">size_t</span> values corresponding to the 
                                local work size parameter of the 
                                intended dispatch. The number of 
                                dimensions in the ND-range will be 
                                inferred from the value specified for 
                                <code class="varname">input_value_size</code>.
                            </p>
                        </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_KERNEL_LOCAL_SIZE_
FOR_SUB_GROUP_COUNT</code>
                      </td>
                      <td align="left">size_t</td>
                      <td align="left">size_t []</td>
                      <td align="left">
                            <p>
                                Returns the local size that will
                                generate the requested number of sub-
                                groups for the kernel. The output array
                                must be an array of <code class="code">size_t</code> values
                                corresponding to the local size
                                parameter. Any returned work-group
                                will have one dimension. Other
                                dimensions inferred from the value
                                specified for <code class="varname">param_value_size</code>
                                will be filled with the value 1. The
                                returned value will produce an exact
                                number of sub-groups and result in no
                                partial groups for an executing kernel
                                except in the case where the last work-
                                group in a dimension has a size
                                different from that of the other groups.
                                If no work-group size can
                                accommodate the requested number of
                                sub-groups, 0 will be returned in each
                                element of the return array.
                            </p>
                        </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_KERNEL_MAX_NUM_SUB_GROUPS</code>
                      </td>
                      <td align="left">ignored</td>
                      <td align="left">size_t</td>
                      <td align="left">
                            This provides a mechanism for the
                            application to query the maximum number
                            of sub-groups that may make up each
                            work-group to execute a kernel on a
                            specific device given by device. The
                            OpenCL implementation uses the resource
                            requirements of the kernel (register usage
                            etc.) to determine what this work-group
                            size should be. The returned value may be
                            used to compute a work-group size to
                            enqueue the kernel with to give a round
                            number of sub-groups for an enqueue.
                        </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_KERNEL_COMPILE_NUM_SUB_GROUPS</code>
                      </td>
                      <td align="left">ignored</td>
                      <td align="left">size_t</td>
                      <td align="left">
                            Returns the number of sub-groups
                            specified in the kernel source or IL. If the
                            sub-group count is not specified using the
                            above attribute then 0 is returned.
                        </td>
                    </tr>
                  </tbody>
                </table>
              </div>
            </dd>
          </dl>
        </div>
      </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. 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_INVALID_DEVICE</span> if <code class="varname">device</code> is
              not in the list of devices associated with <code class="varname">kernel</code> or if
              <code class="varname">device</code> is NULL but there is more than one device associated
              with <code class="varname">kernel</code>.
            </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 &lt; size of return type as described in the table above and
              <code class="varname">param_value</code> is not NULL.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if 
              <code class="varname">param_name</code> is
              <code class="constant">CL_KERNEL_SUB_GROUP_SIZE_FOR_NDRANGE</code> 
              and the size in bytes specified by 
              <code class="varname">input_value_size</code> is not valid 
              or if <code class="varname">input_value</code> is NULL. 
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_KERNEL</span> if <code class="varname">kernel</code> is a not
              a valid kernel 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="https://www.khronos.org/registry/cl/specs/opencl-2.1.pdf#page=236" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
        </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 © 2007-2015 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"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
permit persons to whom the Materials are furnished to do so, subject to
the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials.
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