simple catalog json read/write test

json_catalog_io_profile.ipynb

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 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Tests for reading/writting JSON catalogs"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import json\n",
    "from functools import reduce\n",
    "from operator import add\n",
    "\n",
    "import obspy\n",
    "from obspy.core.util.testing import create_diverse_catalog\n",
    "from obspy.core.event.dict import dict_to_catalog, catalog_to_dict\n",
    "import xmltodict"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "def to_json(cat, path):\n",
    "    cat_dict = catalog_to_dict(cat)\n",
    "    with open(path, 'w') as fi:\n",
    "        json.dump(cat_dict, fi)\n",
    "\n",
    "def from_json(path):\n",
    "    with open(path) as fi:\n",
    "        return dict_to_catalog(json.load(fi))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "# create a test catalog\n",
    "cat = reduce(add, [create_diverse_catalog() for _ in range(100)])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "json_path = 'cat.json'\n",
    "xml_path = 'cat.xml'"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Compare speed of writing catalog"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "CPU times: user 204 ms, sys: 8.03 ms, total: 212 ms\n",
      "Wall time: 211 ms\n"
     ]
    }
   ],
   "source": [
    "%time cat.write('cat2.json', 'json')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "CPU times: user 169 ms, sys: 3.72 ms, total: 172 ms\n",
      "Wall time: 171 ms\n"
     ]
    }
   ],
   "source": [
    "%time to_json(cat, json_path)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "CPU times: user 124 ms, sys: 23 µs, total: 124 ms\n",
      "Wall time: 122 ms\n"
     ]
    }
   ],
   "source": [
    "%time cat.write(xml_path, 'quakeml')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Compare speed of reading catalog"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "CPU times: user 351 ms, sys: 66 µs, total: 351 ms\n",
      "Wall time: 350 ms\n"
     ]
    }
   ],
   "source": [
    "%time cat1 = from_json(json_path)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "CPU times: user 1.15 s, sys: 96 µs, total: 1.15 s\n",
      "Wall time: 1.15 s\n"
     ]
    }
   ],
   "source": [
    "%time cat2 = obspy.read_events(xml_path, 'quakeml')"
   ]
  }
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