{
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  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import multiprocessing\n",
    "import time"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 멀티쓰레드 미사용시 시간"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "p1  :  10000000\n",
      "p1  :  20000000\n",
      "p1  :  30000000\n",
      "p2  :  10000000\n",
      "p2  :  20000000\n",
      "p2  :  30000000\n",
      "p3  :  10000000\n",
      "p3  :  20000000\n",
      "p3  :  30000000\n",
      "p4  :  10000000\n",
      "p4  :  20000000\n",
      "p4  :  30000000\n",
      "====8.327701091766357 seconds====\n",
      "CPU times: user 8.3 s, sys: 21.3 ms, total: 8.32 s\n",
      "Wall time: 8.33 s\n"
     ]
    }
   ],
   "source": [
    "%%time\n",
    "start_time = time.time()\n",
    "\n",
    "def count(name):\n",
    "    for i in range(1, 30000001):\n",
    "        if (i%10000000)==0:\n",
    "            print(name, \" : \", i)\n",
    "            \n",
    "num_list = ['p1','p2','p3','p4']\n",
    "\n",
    "for num in num_list:\n",
    "    count(num)\n",
    "    \n",
    "print(\"===={} seconds====\".format(time.time()-start_time))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "p2  :  10000000\n",
      "p3  :  10000000\n",
      "p4  :  10000000\n",
      "p1  :  10000000\n",
      "p2  :  20000000\n",
      "p3  :  20000000\n",
      "p4  :  20000000\n",
      "p1  :  20000000\n",
      "p2  :  30000000\n",
      "p4  :  30000000\n",
      "p3  :  30000000\n",
      "p1  :  30000000\n",
      "====2.744521141052246 seconds====\n",
      "CPU times: user 17.5 ms, sys: 20.1 ms, total: 37.5 ms\n",
      "Wall time: 2.75 s\n"
     ]
    }
   ],
   "source": [
    "%%time\n",
    "start_time = time.time()\n",
    "\n",
    "def count(name):\n",
    "    for i in range(1, 30000001):\n",
    "        if (i%10000000)==0:\n",
    "            print(name, \" : \", i)\n",
    "            \n",
    "num_list = ['p1','p2','p3','p4']\n",
    "\n",
    "pool = multiprocessing.Pool(processes=4)\n",
    "pool.map(count, num_list)\n",
    "pool.close()\n",
    "pool.join()\n",
    "    \n",
    "print(\"===={} seconds====\".format(time.time()-start_time))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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