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<title>clGetKernelSubGroupInfo</title>
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<meta name="keywords" content="clGetKernelSubGroupInfo" />
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<body>
<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 class="informaltable" 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#namedest=clGetKernelSubGroupInfo" 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
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