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<title>cl_arm_scheduling_controls</title>
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/*! normalize.css v2.1.2 | MIT License | git.io/normalize */
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<body class="book">
<div id="header">
<h1>cl_arm_scheduling_controls</h1>
<div class="details">
<span id="revnumber">version v3.0.6-13-g1d397ac,</span>
<span id="revdate">Mon, 15 Feb 2021 12:23:33 +0000</span>
<br><span id="revremark">from git branch: commit: 1d397ac71be2bb2ca6bca9142bd27e528ab91e1c</span>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_name_strings"><a class="anchor" href="#_name_strings"></a>Name Strings</h2>
<div class="sectionbody">
<div class="paragraph">
<p><code>cl_arm_scheduling_controls</code></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_contact"><a class="anchor" href="#_contact"></a>Contact</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Kevin Petit (kevin.petit 'at' arm.com)</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_contributors"><a class="anchor" href="#_contributors"></a>Contributors</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Kevin Petit, Arm Ltd.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_notice"><a class="anchor" href="#_notice"></a>Notice</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Copyright (c) 2020 Arm Ltd.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_status"><a class="anchor" href="#_status"></a>Status</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Shipping</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_version"><a class="anchor" href="#_version"></a>Version</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Built On: 2021-02-11<br>
Version: 0.3.0</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_dependencies"><a class="anchor" href="#_dependencies"></a>Dependencies</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This extension is written against the OpenCL Specification v3.0.3.</p>
</div>
<div class="paragraph">
<p>This extension requires OpenCL 2.0.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_overview"><a class="anchor" href="#_overview"></a>Overview</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This extension gives applications explicit control over some aspects of work
scheduling. It can be used for performance tuning or debugging.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_new_api_enums"><a class="anchor" href="#_new_api_enums"></a>New API Enums</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Accepted value for the <em>param_name</em> parameter to <strong>clGetDeviceInfo</strong>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="c">CL_DEVICE_SCHEDULING_CONTROLS_CAPABILITIES_ARM <span class="hex">0x41E4</span>
CL_DEVICE_SCHEDULING_KERNEL_BATCHING_ARM (<span class="integer">1</span> &lt;&lt; <span class="integer">0</span>)
CL_DEVICE_SCHEDULING_WORKGROUP_BATCH_SIZE_ARM (<span class="integer">1</span> &lt;&lt; <span class="integer">1</span>)
CL_DEVICE_SCHEDULING_WORKGROUP_BATCH_SIZE_MODIFIER_ARM (<span class="integer">1</span> &lt;&lt; <span class="integer">2</span>)
CL_DEVICE_SCHEDULING_DEFERRED_FLUSH_ARM (<span class="integer">1</span> &lt;&lt; <span class="integer">3</span>)
CL_DEVICE_SCHEDULING_REGISTER_ALLOCATION_ARM (<span class="integer">1</span> &lt;&lt; <span class="integer">4</span>)
CL_DEVICE_SUPPORTED_REGISTER_ALLOCATIONS_ARM <span class="hex">0x41EB</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Accepted value for the <em>param_name</em> parameter to <strong>clSetKernelExecInfo</strong>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="c">CL_KERNEL_EXEC_INFO_WORKGROUP_BATCH_SIZE_ARM <span class="hex">0x41E5</span>
CL_KERNEL_EXEC_INFO_WORKGROUP_BATCH_SIZE_MODIFIER_ARM <span class="hex">0x41E6</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Accepted value for the <em>properties</em> parameter to <strong>clCreateCommandQueueWithProperties</strong>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="c">CL_QUEUE_KERNEL_BATCHING_ARM <span class="hex">0x41E7</span>
CL_QUEUE_DEFERRED_FLUSH_ARM <span class="hex">0x41EC</span></code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_new_build_options"><a class="anchor" href="#_new_build_options"></a>New build options</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This extension adds a build option to control the number of registers allocated
to each thread:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="c">-fregister-allocation=</code></pre>
</div>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
Missing before version 0.3.0
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_modifications_to_the_opencl_api_specification"><a class="anchor" href="#_modifications_to_the_opencl_api_specification"></a>Modifications to the OpenCL API Specification</h2>
<div class="sectionbody">
<div class="dlist">
<dl>
<dt class="hdlist1">(Modify Section 4.2, <strong>Querying Devices</strong>) </dt>
<dd>
<div class="openblock">
<div class="content">
<div class="dlist">
<dl>
<dt class="hdlist1">(Add the following to Table 5, <em>Device Queries</em>) </dt>
</dl>
</div>
</div>
</div>
</dd>
</dl>
</div>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 16.6666%;">
<col style="width: 16.6666%;">
<col style="width: 66.6668%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">cl_device_info</th>
<th class="tableblock halign-left valign-top">Return Type</th>
<th class="tableblock halign-left valign-top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>CL_DEVICE_SCHEDULING_CONTROLS_CAPABILITIES_ARM</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_device_scheduling_controls_capabilities_arm</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Returns a bitfield of the scheduling controls this device supports:
<br>
- <code>CL_DEVICE_SCHEDULING_KERNEL_BATCHING_ARM</code> is set when the device supports
<code>CL_QUEUE_KERNEL_BATCHING_ARM</code>.
<br>
- <code>CL_DEVICE_SCHEDULING_WORKGROUP_BATCH_SIZE_ARM</code> is set when the device
supports <code>CL_KERNEL_EXEC_INFO_WORKGROUP_BATCH_SIZE_ARM</code>.
<br>
- <code>CL_DEVICE_SCHEDULING_WORKGROUP_BATCH_SIZE_MODIFIER_ARM</code> is set when the
device supports <code>CL_KERNEL_EXEC_INFO_WORKGROUP_BATCH_SIZE_MODIFIER_ARM</code>.
- <code>CL_DEVICE_SCHEDULING_DEFERRED_FLUSH_ARM</code> is set when the device supports
<code>CL_QUEUE_DEFERRED_FLUSH_ARM</code>.</p>
<p class="tableblock">- <code>CL_DEVICE_SCHEDULING_REGISTER_ALLOCATION_ARM</code> is set when the device compiler
supports the <code>-fregister-allocation</code> option.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>CL_DEVICE_SUPPORTED_REGISTER_ALLOCATIONS_ARM</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_int[]</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Returns an array of valid register allocations for this device. Each of the
returned values can be passed to the <code>-fregister-allocation</code> build option.<br>
Missing before version 0.3.</p></td>
</tr>
</tbody>
</table>
<div class="openblock">
<div class="content">
</div>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1">(Modify Section 5.1, <strong>Command Queues</strong>) </dt>
<dd>
<div class="openblock">
<div class="content">
<div class="dlist">
<dl>
<dt class="hdlist1">(Add the following to Table 9, <em>List of supported queue creation properties</em>) </dt>
</dl>
</div>
</div>
</div>
</dd>
</dl>
</div>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 16.6666%;">
<col style="width: 16.6666%;">
<col style="width: 66.6668%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Queue Properties</th>
<th class="tableblock halign-left valign-top">Type</th>
<th class="tableblock halign-left valign-top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>CL_QUEUE_KERNEL_BATCHING_ARM</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_bool</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Whether kernels enqueued to this queue should be batched for submission to the
device. <code>CL_TRUE</code> means kernels will be batched, <code>CL_FALSE</code> that they will not.
Defaults to <code>CL_TRUE</code>.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>CL_QUEUE_DEFERRED_FLUSH_ARM</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_bool</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Whether flush operations are performed in the thread triggering the flush or
deferred for execution in another thread managed by the OpenCL runtime.
<code>CL_TRUE</code> means flush operations are deferred. Defaults to <code>CL_TRUE</code>.<br>
Missing before version 0.2.</p></td>
</tr>
</tbody>
</table>
<div class="openblock">
<div class="content">
</div>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1">(Modify Section 5.8.6, <strong>Compiler Options</strong>) </dt>
<dd>
<div class="openblock">
<div class="content">
<div class="dlist">
<dl>
<dt class="hdlist1">(Add the following to <em>Optimization Options</em>) </dt>
</dl>
</div>
</div>
</div>
</dd>
</dl>
</div>
<div class="paragraph">
<p>The following options are supported when building programs created from
source or intermediate language. Specifying these options when building
a program created from a binary will result in {CL_INVALID_BUILD_OPTIONS}
being returned by <strong>clBuildProgram</strong>.</p>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1"><code>-fregister-allocation=&lt;number-of-registers-per-thread&gt;</code> </dt>
<dd>
<p>This option overrides the compiler&#8217;s selection of the number of machine
registers allocated to each thread for all kernels in the program.</p>
</dd>
<dt class="hdlist1"><code>-fregister-allocation=&lt;kernel-name&gt;:&lt;number-of-registers-per-thread&gt;[,&#8230;&#8203;]</code> </dt>
<dd>
<p>This option overrides the compiler&#8217;s selection of the number of machine
registers allocated to each thread for specific kernels in the program.</p>
</dd>
</dl>
</div>
<div class="openblock">
<div class="content">
</div>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1">(Modify Section 5.9, <strong>Kernel Objects</strong>) </dt>
<dd>
<div class="openblock">
<div class="content">
<div class="dlist">
<dl>
<dt class="hdlist1">(Add the following to Table 31, <em>List of param_values accepted by *clSetKernelExecInfo*</em>) </dt>
</dl>
</div>
</div>
</div>
</dd>
</dl>
</div>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 16.6666%;">
<col style="width: 16.6666%;">
<col style="width: 66.6668%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">cl_kernel_exec_info</th>
<th class="tableblock halign-left valign-top">Type</th>
<th class="tableblock halign-left valign-top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>CL_KERNEL_EXEC_INFO_WORKGROUP_BATCH_SIZE_ARM</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_uint</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Set the size of batches of work groups distributed to compute units.
The value is a number of work groups. If set to 0, then the runtime
will pick a suitable value automatically. Defaults to 0. If the value is
greater than the number of work groups necessary to execute a given NDRange,
the actual batch size will be capped at the number of work groups in the
NDRange. When a value is not directly usable due to device-specific
constraints, it will be rounded up to the next usable value.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>CL_KERNEL_EXEC_INFO_WORKGROUP_BATCH_SIZE_MODIFIER_ARM</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_int</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Modify the size of batches of work groups distributed to compute units.</p>
<p class="tableblock">On devices that support <code>CL_KERNEL_EXEC_INFO_WORKGROUP_BATCH_SIZE_ARM</code>, the value is
a number of work groups added to the batch size calculated by the runtime (when
<code>CL_KERNEL_EXEC_INFO_WORKGROUP_BATCH_SIZE_ARM</code> set to 0) or set by the application
(when <code>CL_KERNEL_EXEC_INFO_WORKGROUP_BATCH_SIZE_ARM</code> set to a value greater than 0).</p>
<p class="tableblock">On devices that do not support <code>CL_KERNEL_EXEC_INFO_WORKGROUP_BATCH_SIZE_ARM</code>, the
value is a number in the range [-31,+31]. When set to 0, the runtime-selected
batch size is used unmodified. When set to a non-zero value, each increment of
one unit in either direction around zero will either divide (negative value)
or multiply (positive value) the batch size by 2. If the requested modification
is not possible due to hardware constraints, the greatest possible modification
will be used.</p></td>
</tr>
</tbody>
</table>
<div class="openblock">
<div class="content">
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_interactions_with_other_extensions"><a class="anchor" href="#_interactions_with_other_extensions"></a>Interactions with Other Extensions</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Some features in this extension interact with <code>cl_arm_thread_limit_hint</code>.</p>
</div>
<div class="paragraph">
<p>If <code>CL_KERNEL_EXEC_INFO_WORKGROUP_BATCH_SIZE_ARM</code> or
<code>CL_KERNEL_EXEC_INFO_WORKGROUP_BATCH_SIZE_MODIFIER_ARM</code> is set to a non-default
value at the time a kernel is enqueued, then any thread limit hint specified
in the kernel source using the <code>arm_thread_limit_hint</code> attribute will be
ignored.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_issues"><a class="anchor" href="#_issues"></a>Issues</h2>
<div class="sectionbody">
<div class="paragraph">
<p>None.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_revision_history"><a class="anchor" href="#_revision_history"></a>Revision History</h2>
<div class="sectionbody">
<table class="tableblock frame-all grid-rows stretch">
<colgroup>
<col style="width: 4.7619%;">
<col style="width: 14.2857%;">
<col style="width: 14.2857%;">
<col style="width: 66.6667%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Version</th>
<th class="tableblock halign-left valign-top">Date</th>
<th class="tableblock halign-left valign-top">Author</th>
<th class="tableblock halign-left valign-top">Changes</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">0.3.0</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">2021-01-19</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Kévin Petit</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Add support for register allocation control</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">0.2.0</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">2020-09-14</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Kévin Petit</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Add support for deferred queue flush control</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">0.1.0</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">2020-08-28</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Kévin Petit</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Initial version</p></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
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