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<div class="title">ThrustAllocator.cuh</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment"></span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">/**</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * Copyright (c) 2015-present, Facebook, Inc.</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * All rights reserved.</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * This source code is licensed under the CC-by-NC license found in the</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * LICENSE file in the root directory of this source tree.</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> */</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> </div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">// Copyright 2004-present Facebook. All Rights Reserved.</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> </div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#pragma once</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <cuda.h></span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include <unordered_set></span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">namespace </span>faiss { <span class="keyword">namespace </span>gpu {</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"></span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment">/// Allocator for Thrust that comes out of a specified memory space</span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"><a class="line" href="classfaiss_1_1gpu_1_1GpuResourcesThrustAllocator.html"> 20</a></span> <span class="comment"></span><span class="keyword">class </span><a class="code" href="classfaiss_1_1gpu_1_1GpuResourcesThrustAllocator.html">GpuResourcesThrustAllocator</a> {</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <span class="keyword">public</span>:</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keyword">typedef</span> <span class="keywordtype">char</span> value_type;</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <a class="code" href="classfaiss_1_1gpu_1_1GpuResourcesThrustAllocator.html">GpuResourcesThrustAllocator</a>(<span class="keywordtype">void</span>* mem, <span class="keywordtype">size_t</span> size)</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  : start_((<span class="keywordtype">char</span>*) mem),</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  cur_((<span class="keywordtype">char</span>*) mem),</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  end_((<span class="keywordtype">char</span>*) mem + size) {</div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  }</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  ~<a class="code" href="classfaiss_1_1gpu_1_1GpuResourcesThrustAllocator.html">GpuResourcesThrustAllocator</a>() {</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  }</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> </div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keywordtype">char</span>* allocate(std::ptrdiff_t size) {</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordflow">if</span> (size <= (end_ - cur_)) {</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordtype">char</span>* p = cur_;</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  cur_ += size;</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  FAISS_ASSERT(cur_ <= end_);</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> </div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">return</span> p;</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordtype">char</span>* p = <span class="keyword">nullptr</span>;</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  CUDA_VERIFY(cudaMalloc(&p, size));</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  mallocAllocs_.insert(p);</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordflow">return</span> p;</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  }</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  }</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordtype">void</span> deallocate(<span class="keywordtype">char</span>* p, <span class="keywordtype">size_t</span> size) {</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="comment">// Allocations could be returned out-of-order; ignore those we</span></div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="comment">// didn't cudaMalloc</span></div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keyword">auto</span> it = mallocAllocs_.find(p);</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordflow">if</span> (it != mallocAllocs_.end()) {</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  CUDA_VERIFY(cudaFree(p));</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  mallocAllocs_.erase(it);</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  }</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  }</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> </div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keyword">private</span>:</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordtype">char</span>* start_;</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordtype">char</span>* cur_;</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordtype">char</span>* end_;</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  std::unordered_set<char*> mallocAllocs_;</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> };</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> } } <span class="comment">// namespace</span></div>
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<div class="ttc" id="classfaiss_1_1gpu_1_1GpuResourcesThrustAllocator_html"><div class="ttname"><a href="classfaiss_1_1gpu_1_1GpuResourcesThrustAllocator.html">faiss::gpu::GpuResourcesThrustAllocator</a></div><div class="ttdoc">Allocator for Thrust that comes out of a specified memory space. </div><div class="ttdef"><b>Definition:</b> <a href="ThrustAllocator_8cuh_source.html#l00020">ThrustAllocator.cuh:20</a></div></div>
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