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| <title>clEnqueueNDRangeKernel</title> |
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| <meta name="keywords" content="clEnqueueNDRangeKernel" /> |
| </head> |
| <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="clEnqueueNDRangeKernel"></a> |
| <h1>clEnqueueNDRangeKernel</h1> |
| <p> |
| Enqueues a command to execute a kernel on 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"> |
| clEnqueueNDRangeKernel |
| </strong> |
| (</code> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_command_queue</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">command_queue</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_kernel</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">kernel</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">work_dim</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">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*global_work_offset</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">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*global_work_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">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*local_work_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">cl_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_events_in_wait_list</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_event</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*event_wait_list</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_event</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*event</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"> command_queue </code> </span> |
| </dt> |
| <dd> |
| <p> |
| A valid host command-queue. The kernel will be queued for execution on |
| the device associated with <code class="varname">command_queue</code>. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> kernel </code> </span> |
| </dt> |
| <dd> |
| <p> |
| A valid kernel object. The |
| OpenCL context associated with <code class="varname">kernel</code> and |
| <code class="varname">command_queue</code> must be the same. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> work_dim </code> </span> |
| </dt> |
| <dd> |
| <p> |
| The number of dimensions |
| used to specify the global work-items and work-items in the |
| work-group. <code class="varname">work_dim</code> must be greater than zero and less |
| than or equal to <code class="constant">CL_DEVICE_MAX_WORK_ITEM_DIMENSIONS</code>. |
| If <code class="varname">global_work_size</code> is NULL, or the value in |
| any passed dimension is 0 then the kernel |
| command will trivially succeed after its event |
| dependencies are satisfied and subsequently |
| update its completion event. The behavior in this |
| situation is similar to that of an enqueued |
| marker, except that unlike a marker, an enqueued |
| kernel with no events passed to |
| <code class="varname">event_wait_list</code> may run at any time. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> global_work_offset </code> </span> |
| </dt> |
| <dd> |
| <p> |
| <code class="varname">global_work_offset</code> |
| can be used to specify an array of <code class="varname">work_dim</code> unsigned |
| values that describe the offset used to calculate the global ID of a |
| work-item. If <code class="varname">global_work_offset</code> is NULL, the global |
| IDs start at offset (0, 0, ... 0). |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> global_work_size </code> </span> |
| </dt> |
| <dd> |
| <p> |
| Points to an array of |
| <code class="varname">work_dim</code> unsigned values that describe the number |
| of global work-items in <code class="varname">work_dim</code> dimensions |
| that will execute the kernel function. The total number of global |
| work-items is computed as <code class="varname">global_work_size</code>[0] *...* |
| <code class="varname">global_work_size</code>[<code class="varname">work_dim</code> - 1]. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> local_work_size </code> </span> |
| </dt> |
| <dd> |
| <p> |
| Points to an array of |
| <code class="varname">work_dim</code> unsigned values that describe the number |
| of work-items that make up a work-group (also referred to as the |
| size of the work-group) that will execute the kernel specified |
| by <code class="varname">kernel</code>. The total number of work-items in |
| a work-group is computed as <code class="varname">local_work_size</code>[0] |
| *... * <code class="varname">local_work_size</code>[<code class="varname">work_dim</code> - |
| 1]. The total number of work-items in the work-group must be less than |
| or equal to the <code class="constant">CL_KERNEL_WORK_GROUP_SIZE</code> |
| value specified in table of OpenCL Device Queries for |
| <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a> |
| and the number of work-items specified |
| in <code class="varname">local_work_size</code>[0],... |
| <code class="varname">local_work_size</code>[<code class="varname">work_dim</code> - 1] |
| must be less than or equal to the corresponding values specified |
| by <code class="constant">CL_DEVICE_MAX_WORK_ITEM_SIZES</code>[0],.... |
| <code class="constant">CL_DEVICE_MAX_WORK_ITEM_SIZES</code>[<code class="varname">work_dim</code> |
| - 1]. The explicitly specified <code class="varname">local_work_size</code> |
| will be used to determine how to break the global work-items specified |
| by <code class="varname">global_work_size</code> into appropriate work-group |
| instances. |
| </p> |
| <p> |
| Enabling non-uniform work-groups requires a |
| kernel to be compiled with the -cl-std=CL2.0 flag |
| and without the -cl-uniform-work-group-size |
| flag. If the program was created using |
| clLinkProgram and any of the linked programs |
| were compiled in a way that only supports |
| uniform work-group sizes, the linked program |
| only supports uniform work group sizes. If |
| local_work_size is specified and the OpenCL |
| kernel is compiled without non-uniform work- |
| groups enabled, the values specified in |
| global_work_size[0], ... global_work_size[work_dim - 1] |
| must be evenly divisible by the corresponding |
| values specified in local_work_ size[0], ... |
| local_work_size[work_dim – 1]. |
| </p> |
| <p> |
| If non-uniform work-groups are enabled for the |
| kernel, any single dimension for which the |
| global size is not divisible by the local size |
| will be partitioned into two regions. One region will |
| have work-groups that have the same number of |
| work items as was specified by the local size |
| parameter in that dimension. The other region |
| will have work-groups with less than the number |
| of work items specified by the local size |
| parameter in that dimension. The global IDs and group |
| IDs of the work items in the first region will |
| be numerically lower than those in the second, and |
| the second region will be at most one work-group |
| wide in that dimension. Work-group sizes |
| could be non-uniform in multiple dimensions, |
| potentially producing work-groups of up to 4 |
| different sizes in a 2D range and 8 different |
| sizes in a 3D range. |
| </p> |
| <p> |
| If <code class="varname">local_work_size</code> is NULL and the |
| kernel is compiled without support for non-uniform work- |
| groups, the OpenCL runtime will implement the |
| ND-range with uniform work-group sizes. If |
| <code class="varname">local_work_size</code> is NULL and |
| non-uniform-work-groups are enabled, the OpenCL runtime is |
| free to implement the ND-range using uniform or |
| non-uniform work-group sizes, regardless of |
| the divisibility of the global work size. If the |
| ND-range is implemented using non-uniform |
| work-group sizes, the work-group sizes, global |
| IDs and group IDs will follow the same pattern |
| as described in above paragraph. |
| </p> |
| <p> |
| The work-group size to be used for |
| <code class="varname">kernel</code> can also be |
| specified in the program source or |
| intermediate language. In this case the size |
| of work group specified by <code class="varname">local_work_size</code> must |
| match the value specified in the program source. |
| </p> |
| <p> |
| These work-group instances are executed in parallel across multiple compute units or |
| concurrently on the same compute unit. |
| </p> |
| <p> |
| Each work-item is uniquely identified by a global identifier. The global ID, |
| which can be read inside the kernel, is computed using the value given by |
| <code class="varname">global_work_size</code> and <code class="varname">global_work_offset</code>. |
| In addition, a work-item is also identified within a work-group by a unique local ID. |
| The local ID, which can also be read by the kernel, is computed using the value given |
| by <code class="varname">local_work_size</code>. The starting local ID is always (0, 0, ... 0). |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">event_wait_list</code> and |
| <code class="varname">num_events_in_wait_list</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| Specify events that need |
| to complete before this particular command can be executed. If |
| <code class="varname">event_wait_list</code> is NULL, then this particular command does |
| not wait on any event to complete. If <code class="varname">event_wait_list</code> |
| is NULL, <code class="varname">num_events_in_wait_list</code> must be 0. If |
| <code class="varname">event_wait_list</code> is not NULL, the list of events |
| pointed to by <code class="varname">event_wait_list</code> must be valid |
| and <code class="varname">num_events_in_wait_list</code> must be greater |
| than 0. The events specified in <code class="varname">event_wait_list</code> |
| act as synchronization points. The context associated with events in |
| <code class="varname">event_wait_list</code> and <code class="varname">command_queue</code> must |
| be the same. The memory associated with <code class="varname">event_wait_list</code> |
| can be reused or freed after the function returns. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> event </code> </span> |
| </dt> |
| <dd> |
| <p> |
| Returns an event object that identifies |
| this particular kernel-instance. Event objects are unique and |
| can be used to identify a particular kernel execution instance later on. If |
| <code class="varname">event</code> is NULL, no event will be created for this kernel |
| execution instance and therefore it will not be possible for the application |
| to query or queue a wait for this particular kernel execution instance. |
| If the <code class="varname">event_wait_list</code> and the |
| <code class="varname">event</code> arguments are not NULL, the |
| <code class="varname">event</code> argument |
| should not refer to an element of the |
| <code class="varname">event_wait_list</code> array. |
| </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 kernel execution was successfully queued. |
| 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_PROGRAM_EXECUTABLE</span> |
| if there is no successfully built program |
| executable available for device associated with <code class="varname">command_queue</code>. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_COMMAND_QUEUE</span> if <code class="varname">command_queue</code> |
| is not a valid host command-queue. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_KERNEL</span> if <code class="varname">kernel</code> is |
| not a valid kernel object. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_CONTEXT</span> if context associated with |
| <code class="varname">command_queue</code> and <code class="varname">kernel</code> are not the same |
| or if the context associated with <code class="varname">command_queue</code> and events in |
| <code class="varname">event_wait_list</code> are not the same. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_KERNEL_ARGS</span> if the kernel argument values |
| have not been specified or if |
| a kernel argument declared to be a pointer to a |
| type does not point to a named address space. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_WORK_DIMENSION</span> if <code class="varname">work_dim</code> |
| is not a valid value (i.e. a value between 1 and 3). |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_GLOBAL_WORK_SIZE</span> if |
| any of the values specified in |
| <code class="varname">global_work_size</code>[0], ...<code class="varname">global_work_size</code> |
| [<code class="varname">work_dim</code> - 1] exceed the range given by the |
| <code class="code">sizeof(size_t)</code> for the device on which the kernel execution will |
| be enqueued. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_GLOBAL_OFFSET</span> if the value specified |
| in <code class="varname">global_work_size</code> + the corresponding values in |
| <code class="varname">global_work_offset</code> for any dimensions is greater than the |
| <code class="code">sizeof(size_t)</code> for the device on which the kernel execution will |
| be enqueued. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_WORK_GROUP_SIZE</span> if |
| <code class="varname">local_work_size</code> is specified and does not match |
| the required work-group size for <code class="varname">kernel</code> in the program source. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_WORK_GROUP_SIZE</span> if |
| <code class="varname">local_work_size</code> is specified and is not |
| consistent with the required number of sub-groups for |
| <code class="varname">kernel</code> in the program source. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_WORK_GROUP_SIZE</span> |
| if <code class="varname">local_work_size</code> is |
| specified and the total number |
| of work-items in the work-group computed as |
| <code class="varname">local_work_size</code>[0] * ... |
| <code class="varname">local_work_size</code>[<code class="varname">work_dim</code> – 1] |
| is greater than the value specified by |
| <code class="constant">CL_KERNEL_WORK_GROUP_SIZE</code> in table 5.21. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_WORK_GROUP_SIZE</span> if the program was compiled |
| with <code class="code">–cl-uniform-work-group-size</code> and the number of work-items |
| specified by <code class="varname">global_work_size</code> is not |
| evenly divisible by size of work-group given by <code class="varname">local_work_size</code> |
| or by the required work- |
| group size specified in the kernel source. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_WORK_ITEM_SIZE</span> if the number of |
| work-items specified in any of <code class="varname">local_work_size</code>[0], |
| ... <code class="varname">local_work_size</code>[<code class="varname">work_dim</code> |
| - 1] is greater than the corresponding values specified by |
| <code class="constant">CL_DEVICE_MAX_WORK_ITEM_SIZES</code>[0], .... |
| <code class="constant">CL_DEVICE_MAX_WORK_ITEM_SIZES</code>[<code class="varname">work_dim</code> |
| - 1]. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_MISALIGNED_SUB_BUFFER_OFFSET</span> if a sub-buffer object |
| is specified as the value for an argument that is a buffer object and the |
| <code class="varname">offset</code> specified when the sub-buffer object is created is not |
| aligned to <code class="constant">CL_DEVICE_MEM_BASE_ADDR_ALIGN</code> value for device |
| associated with <code class="varname">queue</code>. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_IMAGE_SIZE</span> if an image object is specified |
| as an argument value and the image dimensions (image width, height, specified |
| or compute row and/or slice pitch) are not supported by device associated with |
| <code class="varname">queue</code>. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_IMAGE_FORMAT_NOT_SUPPORTED</span> if an image object is specified |
| as an argument value and the image format (image channel order and data type) |
| is not supported by device associated with <code class="varname">queue</code>. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_RESOURCES</span> if there is a failure to queue the |
| execution instance of <code class="varname">kernel</code> on the command-queue because of |
| insufficient resources needed to execute the kernel. For example, the explicitly |
| specified <code class="varname">local_work_size</code> causes a failure to execute the kernel |
| because of insufficient resources such as registers or local memory. Another example |
| would be the number of read-only image args used in <code class="varname">kernel</code> |
| exceed the <code class="constant">CL_DEVICE_MAX_READ_IMAGE_ARGS</code> value for |
| device or the number of write-only image args used in <code class="varname">kernel</code> |
| exceed the <code class="constant">CL_DEVICE_MAX_READ_WRITE_IMAGE_ARGS</code> value for |
| device or the number of samplers used in <code class="varname">kernel</code> exceed |
| <code class="constant">CL_DEVICE_MAX_SAMPLERS</code> for device. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_MEM_OBJECT_ALLOCATION_FAILURE</span> if there is a failure to |
| allocate memory for data store associated with image or buffer objects specified |
| as arguments to <code class="varname">kernel</code>. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_EVENT_WAIT_LIST</span> |
| if <code class="varname">event_wait_list</code> is NULL and |
| <code class="varname">num_events_in_wait_list</code> > 0, |
| or <code class="varname">event_wait_list</code> is not NULL and |
| <code class="varname">num_events_in_wait_list</code> is 0, or if event objects in |
| <code class="varname">event_wait_list</code> are not valid events. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_OPERATION</span> if SVM |
| pointers are passed as arguments to a kernel and the |
| device does not support SVM or if system |
| pointers are passed as arguments to a kernel |
| and/or stored inside SVM allocations passed as |
| kernel arguments and the device does not |
| support fine grain system SVM allocations. |
| </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=242" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="clCreateCommandQueueWithProperties.html"><span class="citerefentry"><span class="refentrytitle">clCreateCommandQueueWithProperties</span></span></a>, |
| <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>, |
| <a class="citerefentry" href="clEnqueueNativeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNativeKernel</span></span></a>, |
| <a class="citerefentry" href="workItemFunctions.html"><span class="citerefentry"><span class="refentrytitle">Work-Item Functions</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 |
| 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. |
| </div> |
| </div> |
| </body> |
| </html> |
