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| <title>clEnqueueMigrateMemObjects</title> |
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| <meta name="keywords" content="clEnqueueMigrateMemObjects" /> |
| </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="clEnqueueMigrateMemObjects"></a> |
| <h1> |
| clEnqueueMigrateMemObjects |
| </h1> |
| <p> |
| Enqueues a command to indicate which device a set of memory objects should be associated with. |
| </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">clEnqueueMigrateMemObjects </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="scalarDataTypes.html" target="pagedisplay">cl_uint</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_mem_objects</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_mem</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*mem_objects</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_mem_migration_flags" target="pagedisplay">cl_mem_migration_flags</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">flags</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 specified set of memory objects in |
| <code class="varname">mem_objects</code> will be migrated to the OpenCL device |
| associated with <code class="varname">command_queue</code> or to the host if the |
| <code class="constant">CL_MIGRATE_MEM_OBJECT_HOST</code> has been specified. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> num_mem_objects </code> </span> |
| </dt> |
| <dd> |
| <p> |
| The number of memory objects specified in <code class="varname">mem_objects</code>. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> mem_objects </code> </span> |
| </dt> |
| <dd> |
| <p> |
| A pointer to a list of memory objects. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> flags </code> </span> |
| </dt> |
| <dd> |
| <p> |
| A bit-field that is used to specify migration options. The table below |
| describes the possible values for flags. |
| </p> |
| <div class="informaltable"> |
| <table class="informaltable" border="1"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| <col align="left" class="col2" /> |
| </colgroup> |
| <thead> |
| <tr> |
| <th align="left">cl_mem_migration flags</th> |
| <th align="left">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MIGRATE_MEM_OBJECT_HOST</code> |
| </td> |
| <td align="left"> |
| This flag indicates that the specified set of memory objects |
| are to be migrated to the host, regardless of the target |
| command-queue. |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MIGRATE_MEM_OBJECT_- |
| CONTENT_UNDEFINED</code> |
| </td> |
| <td align="left"> |
| This flag indicates that the contents of the set of memory |
| objects are undefined after migration. The specified set |
| of memory objects are migrated to the device associated with |
| <code class="varname">command_queue</code> without incurring the overhead |
| of migrating their contents. |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname"> |
| event_wait_list, 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 command and |
| can be used to query or queue a wait for this particular command |
| to complete. <code class="varname">event</code> can be NULL in which case |
| it will not be possible for the application to query the status of |
| this command or queue a wait for this command to complete. 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="notes"></a> |
| <h2>Notes</h2> |
| <p> |
| This section describes a mechanism for assigning which device an OpenCL memory object |
| resides. A user may wish to have more explicit control over the location of their memory objects |
| on creation. This could be used to: |
| |
| </p> |
| <div class="itemizedlist"> |
| <ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem" style="list-style-type: disc">Ensure that an object is allocated on a specific device prior to usage.</li> |
| <li class="listitem" style="list-style-type: disc">Preemptively migrate an object from one device to another.</li> |
| </ul> |
| </div> |
| <p> |
| </p> |
| <p> |
| Typically, memory objects are implicitly migrated to a device |
| for which enqueued commands, using the memory object, are targeted. |
| <code class="function">clEnqueueMigrateMemObjects</code> allows this migration to be explicitly |
| performed ahead of the dependent commands. This allows a user to preemptively change |
| the association of a memory object, through regular command queue scheduling, in |
| order to prepare for another upcoming command. This also permits an application to |
| overlap the placement of memory objects with other unrelated operations before |
| these memory objects are needed potentially hiding transfer latencies. Once |
| the event, returned from <code class="function">clEnqueueMigrateMemObjects</code>, |
| has been marked <code class="constant">CL_COMPLETE</code> the memory objects specified |
| in <code class="varname">mem_objects</code> have been successfully migrated to the device |
| associated with <code class="varname">command_queue</code>. The migrated memory object shall |
| remain resident on the device until another command is enqueued that either implicitly |
| or explicitly migrates it away. |
| </p> |
| <p> |
| <code class="function">clEnqueueMigrateMemObjects</code> can also be used to direct the initial |
| placement of a memory object, after creation, possibly avoiding the initial overhead |
| of instantiating the object on the first enqueued command to use it. |
| </p> |
| <p> |
| The user is responsible for managing the event dependencies, associated with this |
| command, in order to avoid overlapping access to memory objects. Improperly specified |
| event dependencies passed to <code class="function">clEnqueueMigrateMemObjects</code> could |
| result in undefined results. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="errors"></a> |
| <h2>Errors</h2> |
| <p> |
| <code class="function">clEnqueueMigrateMemObjects</code> 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_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_CONTEXT</span> if the context associated with |
| <code class="varname">command_queue</code> and memory objects in <code class="varname">memobj</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_MEM_OBJECT</span> if any of the memory objects in |
| <code class="varname">mem_objs</code> is not a valid memory object. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">num_mem_objects</code> |
| is zero or if <code class="varname">mem_objects</code> is NULL. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">flags</code> is |
| not 0 or is not any of the values described in the table above. |
| </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_MEM_OBJECT_ALLOCATION_FAILURE</span> if there is a |
| failure to allocate memory for the specified set of memory objects in |
| <code class="varname">mem_objects</code>. |
| </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=clEnqueueMigrateMemObjects" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a>, |
| <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</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> |
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