test_3gpu.ipynb

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  {
   "cell_type": "code",
   "execution_count": 1,
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   "source": [
    "import numpy as np\n",
    "import faiss"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "8"
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     "execution_count": 2,
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   "source": [
    "faiss.get_num_gpus()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "def my_index_cpu_to_gpu_multiple(resources, index, co=None, gpu_nos=None):\n",
    "    vres = faiss.GpuResourcesVector()\n",
    "    vdev = faiss.IntVector()\n",
    "    if gpu_nos is None: \n",
    "        gpu_nos = range(len(resources))\n",
    "    for i, res in zip(gpu_nos, resources):\n",
    "        vdev.push_back(i)\n",
    "        vres.push_back(res)\n",
    "    index = faiss.index_cpu_to_gpu_multiple(vres, vdev, index, co)\n",
    "    index.referenced_objects = resources\n",
    "    return index"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Test with 20k vectors "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "x = faiss.rand((20000, 512))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "CPU times: user 136 ms, sys: 541 ms, total: 677 ms\n",
      "Wall time: 581 ms\n"
     ]
    }
   ],
   "source": [
    "%%time\n",
    "gpu_nos = [1,2,3]\n",
    "resources = [faiss.StandardGpuResources() for i in gpu_nos]\n",
    "index_gpu = my_index_cpu_to_gpu_multiple(resources, faiss.IndexFlatL2(512), gpu_nos=gpu_nos)\n",
    "index_gpu.add(x)\n",
    "D, I = index_gpu.search(x, 128)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "CPU times: user 71.5 ms, sys: 338 ms, total: 409 ms\n",
      "Wall time: 408 ms\n"
     ]
    }
   ],
   "source": [
    "%%time\n",
    "gpu_nos = [2]\n",
    "resources = [faiss.StandardGpuResources() for i in gpu_nos]\n",
    "index_gpu = my_index_cpu_to_gpu_multiple(resources, faiss.IndexFlatL2(512), gpu_nos=gpu_nos)\n",
    "index_gpu.add(x)\n",
    "D, I = index_gpu.search(x, 128)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Test with 200k vectors "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "x = faiss.rand((200000, 512))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "CPU times: user 3.7 s, sys: 2.55 s, total: 6.25 s\n",
      "Wall time: 2.45 s\n"
     ]
    }
   ],
   "source": [
    "%%time\n",
    "gpu_nos = [1,2,3]\n",
    "resources = [faiss.StandardGpuResources() for i in gpu_nos]\n",
    "index_gpu = my_index_cpu_to_gpu_multiple(resources, faiss.IndexFlatL2(512), gpu_nos=gpu_nos)\n",
    "index_gpu.add(x)\n",
    "D, I = index_gpu.search(x, 128)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "CPU times: user 3.39 s, sys: 1.99 s, total: 5.38 s\n",
      "Wall time: 5.37 s\n"
     ]
    }
   ],
   "source": [
    "%%time\n",
    "gpu_nos = [2]\n",
    "resources = [faiss.StandardGpuResources() for i in gpu_nos]\n",
    "index_gpu = my_index_cpu_to_gpu_multiple(resources, faiss.IndexFlatL2(512), gpu_nos=gpu_nos)\n",
    "index_gpu.add(x)\n",
    "D, I = index_gpu.search(x, 128)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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