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<!DOCTYPE html>
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<title>arrayfire.cuda — ArrayFire Python documentation</title>
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<h1>Source code for arrayfire.cuda</h1><div class="highlight"><pre>
<span></span><span class="c1">#######################################################</span>
<span class="c1"># Copyright (c) 2015, ArrayFire</span>
<span class="c1"># All rights reserved.</span>
<span class="c1">#</span>
<span class="c1"># This file is distributed under 3-clause BSD license.</span>
<span class="c1"># The complete license agreement can be obtained at:</span>
<span class="c1"># http://arrayfire.com/licenses/BSD-3-Clause</span>
<span class="c1">########################################################</span>
<span class="sd">"""</span>
<span class="sd">Functions specific to CUDA backend.</span>
<span class="sd">This module provides interoperability with other CUDA libraries.</span>
<span class="sd">"""</span>
<div class="viewcode-block" id="get_stream"><a class="viewcode-back" href="../../arrayfire.cuda.html#arrayfire.cuda.get_stream">[docs]</a><span class="k">def</span> <span class="nf">get_stream</span><span class="p">(</span><span class="n">idx</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Get the CUDA stream used for the device `idx` by ArrayFire.</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> idx : int.</span>
<span class="sd"> Specifies the index of the device.</span>
<span class="sd"> Returns</span>
<span class="sd"> -----------</span>
<span class="sd"> stream : integer denoting the stream id.</span>
<span class="sd"> """</span>
<span class="kn">import</span> <span class="nn">ctypes</span> <span class="k">as</span> <span class="nn">ct</span>
<span class="kn">from</span> <span class="nn">.util</span> <span class="kn">import</span> <span class="n">safe_call</span> <span class="k">as</span> <span class="n">safe_call</span>
<span class="kn">from</span> <span class="nn">.library</span> <span class="kn">import</span> <span class="n">backend</span> <span class="k">as</span> <span class="n">backend</span>
<span class="k">if</span> <span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">name</span><span class="p">()</span> <span class="o">!=</span> <span class="s2">"cuda"</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s2">"Invalid backend loaded"</span><span class="p">)</span>
<span class="n">stream</span> <span class="o">=</span> <span class="n">c_void_ptr_t</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">afcu_get_stream</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">stream</span><span class="p">),</span> <span class="n">idx</span><span class="p">))</span>
<span class="k">return</span> <span class="n">stream</span><span class="o">.</span><span class="n">value</span></div>
<div class="viewcode-block" id="get_native_id"><a class="viewcode-back" href="../../arrayfire.cuda.html#arrayfire.cuda.get_native_id">[docs]</a><span class="k">def</span> <span class="nf">get_native_id</span><span class="p">(</span><span class="n">idx</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Get native (unsorted) CUDA device ID</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> idx : int.</span>
<span class="sd"> Specifies the (sorted) index of the device.</span>
<span class="sd"> Returns</span>
<span class="sd"> -----------</span>
<span class="sd"> native_idx : integer denoting the native cuda id.</span>
<span class="sd"> """</span>
<span class="kn">import</span> <span class="nn">ctypes</span> <span class="k">as</span> <span class="nn">ct</span>
<span class="kn">from</span> <span class="nn">.util</span> <span class="kn">import</span> <span class="n">safe_call</span> <span class="k">as</span> <span class="n">safe_call</span>
<span class="kn">from</span> <span class="nn">.library</span> <span class="kn">import</span> <span class="n">backend</span> <span class="k">as</span> <span class="n">backend</span>
<span class="k">if</span> <span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">name</span><span class="p">()</span> <span class="o">!=</span> <span class="s2">"cuda"</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s2">"Invalid backend loaded"</span><span class="p">)</span>
<span class="n">native</span> <span class="o">=</span> <span class="n">c_int_t</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">afcu_get_native_id</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">native</span><span class="p">),</span> <span class="n">idx</span><span class="p">))</span>
<span class="k">return</span> <span class="n">native</span><span class="o">.</span><span class="n">value</span></div>
<div class="viewcode-block" id="set_native_id"><a class="viewcode-back" href="../../arrayfire.cuda.html#arrayfire.cuda.set_native_id">[docs]</a><span class="k">def</span> <span class="nf">set_native_id</span><span class="p">(</span><span class="n">idx</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Set native (unsorted) CUDA device ID</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> idx : int.</span>
<span class="sd"> Specifies the (unsorted) native index of the device.</span>
<span class="sd"> """</span>
<span class="kn">import</span> <span class="nn">ctypes</span> <span class="k">as</span> <span class="nn">ct</span>
<span class="kn">from</span> <span class="nn">.util</span> <span class="kn">import</span> <span class="n">safe_call</span> <span class="k">as</span> <span class="n">safe_call</span>
<span class="kn">from</span> <span class="nn">.library</span> <span class="kn">import</span> <span class="n">backend</span> <span class="k">as</span> <span class="n">backend</span>
<span class="k">if</span> <span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">name</span><span class="p">()</span> <span class="o">!=</span> <span class="s2">"cuda"</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s2">"Invalid backend loaded"</span><span class="p">)</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">afcu_set_native_id</span><span class="p">(</span><span class="n">idx</span><span class="p">))</span>
<span class="k">return</span></div>
</pre></div>
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