Example using joblib for running systemcalls in parallel

joblib_poc

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   "source": [
    "import subprocess\n",
    "import functools\n",
    "from IPython.core.magic import line_magic, Magics, magics_class\n",
    "import joblib\n",
    "\n",
    "\n",
    "def systemcall(to_exec):\n",
    "    proc = subprocess.Popen(to_exec, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)\n",
    "    stdout, stderr = proc.communicate()\n",
    "    retval = proc.returncode\n",
    "\n",
    "    return(stdout, stderr, retval)\n",
    "\n",
    "@magics_class\n",
    "class JobManager(Magics):\n",
    "    jobs = []\n",
    "    ncpus = 2\n",
    "    \n",
    "    def __init__(self, shell, systemcaller):\n",
    "        super(JobManager, self).__init__(shell)\n",
    "        self.systemcall = systemcaller\n",
    "    \n",
    "    @line_magic\n",
    "    def stage(self, line):\n",
    "        self.jobs.append(line)\n",
    "        \n",
    "    @line_magic\n",
    "    def execute(self, line):\n",
    "        to_run = self.jobs\n",
    "        self.jobs = []\n",
    "        \n",
    "        if to_run:\n",
    "            return joblib.Parallel(n_jobs=self.ncpus)(joblib.delayed(self.systemcall)(f) for f in to_run)\n",
    "        else:\n",
    "            return []\n",
    "    \n",
    "ip = get_ipython()\n",
    "magics = JobManager(ip, systemcall)\n",
    "ip.register_magics(magics)"
   ]
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   "cell_type": "code",
   "execution_count": 12,
   "metadata": {
    "collapsed": false
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "[(b'sandbar.local\\n', b'', 0),\n",
       " (b'14:38  up 22:29, 7 users, load averages: 1.80 1.79 1.69\\n', b'', 0),\n",
       " (b'', b'', 0),\n",
       " (b'', b'/bin/sh: foobar: command not found\\n', 127)]"
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     "execution_count": 12,
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   "source": [
    "%stage hostname\n",
    "%stage uptime\n",
    "%stage sleep 10\n",
    "%stage foobar\n",
    "%execute"
   ]
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   "source": [
    "def do_something(a, b):\n",
    "    return a+b\n",
    "\n",
    "def do_something_else(x, y=None, z=10):\n",
    "    if y is None:\n",
    "        return x\n",
    "    else:\n",
    "        return x + y + z\n",
    "    \n",
    "jm.stage('hostname')\n",
    "jm.stage('uptime')\n",
    "jm.stage('sleep 10')\n",
    "#jm.stage(do_something, 5, 10)\n",
    "#jm.stage(do_something, 10, 15)\n",
    "#jm.stage(do_something_else, 10)\n",
    "#jm.stage(do_something_else, 10, 20, 30)\n",
    "#jm.stage(do_something_else, 10, z=20, y=30)\n",
    "#jm.stage(do_something_else, 10, y=None, z=30)"
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   "cell_type": "code",
   "execution_count": null,
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   "source": [
    "%time jm.run()"
   ]
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   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
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   "outputs": [],
   "source": [
    "%stage hostname\n",
    "%stage uptime\n",
    "%stage do_something(5, 10)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "%execute"
   ]
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   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
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