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<title>clGetKernelWorkGroupInfo</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="clGetKernelWorkGroupInfo"></a>
<h1>
clGetKernelWorkGroupInfo
</h1>
<p>
Returns information about the kernel object that may be specific to a device.
</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">clGetKernelWorkGroupInfo</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_work_group_info" target="pagedisplay">cl_kernel_work_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">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">clGetKernelWorkGroupInfo</code> is described in the table
below.
</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>
<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_kernel_work_group_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_KERNEL_GLOBAL_WORK_SIZE</code>
</td>
<td align="left">size_t[3]</td>
<td align="left">
This provides a mechanism for the application to query the maximum global
size that can be used to execute a kernel (i.e. <code class="varname">global_work_size</code>
argument to <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a>)
on a custom device given by <code class="varname">device</code> or a built-in kernel on an OpenCL device
given by <code class="varname">device</code>.
<p>
If <code class="varname">device</code> is not a custom device
or <code class="varname">kernel</code> is not a built-in kernel,
<code class="function">clGetKernelWorkGroupInfo</code>
returns the error <code class="constant">CL_INVALID_VALUE</code>.
</p>
</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_KERNEL_WORK_GROUP_SIZE</code>
</td>
<td align="left">size_t</td>
<td align="left">
<p>
This provides a mechanism for the application
to query the maximum work-group size
that can be used to execute the kernel on a
specific device given by <code class="varname">device</code>. The
OpenCL implementation uses the resource requirements of the kernel
(register usage etc.) to determine what this work-group size should be.
</p>
<p>
As a result and unlike
<code class="constant">CL_DEVICE_MAX_WORK_GROUP_SIZE</code>
this value may vary from one kernel
to another as well as one device to
another.
</p>
<p>
<code class="constant">CL_KERNEL_WORK_GROUP_SIZE</code>
will be less than or equal to
<code class="constant">CL_DEVICE_MAX_WORK_GROUP_SIZE</code>
for a given kernel object.
</p>
</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_KERNEL_COMPILE_-
WORK_GROUP_SIZE</code>
</td>
<td align="left">size_t[3]</td>
<td align="left">
Returns the work-group size specified in
the kernel source or IL.
If the work-group size is not specified in the kernel
source or IL, (0, 0, 0) is returned.
</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_KERNEL_LOCAL_MEM_SIZE</code>
</td>
<td align="left">cl_ulong</td>
<td align="left">
<p>
Returns the amount of local memory in bytes being
used by a kernel. This includes local memory that may
be needed by an implementation to execute the kernel,
variables declared inside the kernel with the <a class="citerefentry" href="local.html"><span class="citerefentry"><span class="refentrytitle">__local</span></span></a>
address qualifier and local memory to
be allocated for arguments to the kernel
declared as pointers with the <a class="citerefentry" href="local.html"><span class="citerefentry"><span class="refentrytitle">__local</span></span></a>
address qualifier and whose size is specified with
<a class="citerefentry" href="clSetKernelArg.html"><span class="citerefentry"><span class="refentrytitle">clSetKernelArg</span></span></a>.
</p>
<p>
If the local memory size, for any pointer
argument to the kernel declared with the <a class="citerefentry" href="local.html"><span class="citerefentry"><span class="refentrytitle">__local</span></span></a>
address qualifier, is not specified, its size is assumed
to be 0.
</p>
</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_KERNEL_PREFERRED_WORK_-
GROUP_SIZE_MULTIPLE</code>
</td>
<td align="left">size_t</td>
<td align="left">
Returns the preferred multiple of workgroup size for launch. This is
a performance hint. Specifying a workgroup size that is not a multiple
of the value returned by this query as the value of the local work size argument
to <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a> will
not fail to enqueue the kernel for execution unless the work-group size specified is
larger than the device maximum.
</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_KERNEL_PRIVATE_MEM_SIZE</code>
</td>
<td align="left">cl_ulong</td>
<td align="left">
Returns the minimum amount of private memory, in bytes, used by each work-item in the
kernel. This value may include any private memory needed by an implementation to
execute the kernel, including that used by the language built-ins and variable declared
inside the kernel with the
<a class="citerefentry" href="private.html"><span class="citerefentry"><span class="refentrytitle">__private</span></span></a> qualifier.
</td>
</tr>
</tbody>
</table>
</div>
</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>
</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_GLOBAL_WORK_SIZE</code> and <code class="varname">device</code>
is not a custom device and <code class="varname">kernel</code> is not a built-in kernel.
</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=233" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="clCreateKernel.html"><span class="citerefentry"><span class="refentrytitle">clCreateKernel</span></span></a>,
<a class="citerefentry" href="clCreateKernelsInProgram.html"><span class="citerefentry"><span class="refentrytitle">clCreateKernelsInProgram</span></span></a>,
<a class="citerefentry" href="clReleaseKernel.html"><span class="citerefentry"><span class="refentrytitle">clReleaseKernel</span></span></a>,
<a class="citerefentry" href="clRetainKernel.html"><span class="citerefentry"><span class="refentrytitle">clRetainKernel</span></span></a>,
<a class="citerefentry" href="clSetKernelArg.html"><span class="citerefentry"><span class="refentrytitle">clSetKernelArg</span></span></a>,
<a class="citerefentry" href="clGetKernelInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetKernelInfo</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 © 2007-2015 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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