Ruby: yajl vs oj benchmark

json.rb

require 'benchmark/ips'
require 'oj'
require 'yajl'

FILENAME = 'tweet.json'.freeze

json = File.read(FILENAME)

Benchmark.ips do |x|
  x.config(time: 20, warmup: 2)

  x.report('yajl parser') do
    Yajl::Parser.parse(json)
  end

  x.report('oj parser') do
    Oj.load(json)
  end

  x.compare!
end

results.txt

Results when relatively large JSON file (3 075B) is parsed

Warming up --------------------------------------
         yajl parser     1.487k i/100ms
           oj parser     2.353k i/100ms
Calculating -------------------------------------
         yajl parser     13.258k (±14.9%) i/s -    258.738k in  20.044143s
           oj parser     22.691k (±15.0%) i/s -    440.011k in  20.031725s

Comparison:
           oj parser:    22691.2 i/s
         yajl parser:    13258.1 i/s - 1.71x  slower

---

Results when small JSON file (53B) is parsed

Warming up --------------------------------------
         yajl parser    30.044k i/100ms
           oj parser    51.803k i/100ms
Calculating -------------------------------------
         yajl parser    348.436k (± 3.2%) i/s -      6.970M in  20.025251s
           oj parser    619.713k (± 3.4%) i/s -     12.381M in  20.005138s

Comparison:
           oj parser:   619713.3 i/s
         yajl parser:   348436.4 i/s - 1.78x  slower

simple.json

{
  "account_id": "acc123",
  "user_id": "user123"
}

tweet.json

{
  "data": {
    "created_at": "Fri Jun 06 17:49:39 +0000 2014",
    "id": 474971393852182500,
    "id_str": "474971393852182528",
    "text": "We can neither confirm nor deny that this is our first tweet.",
    "truncated": false,
    "entities": {
      "hashtags": [],
      "symbols": [],
      "user_mentions": [],
      "urls": []
    },
    "source": "<a href=\"http://twitter.com\" rel=\"nofollow\">Twitter Web Client</a>",
    "in_reply_to_status_id": null,
    "in_reply_to_status_id_str": null,
    "in_reply_to_user_id": null,
    "in_reply_to_user_id_str": null,
    "in_reply_to_screen_name": null,
    "user": {
      "id": 2359926157,
      "id_str": "2359926157",
      "name": "CIA",
      "screen_name": "CIA",
      "location": "Langley, VA",
      "description": "We are the Nation's first line of defense. We accomplish what others cannot accomplish and go where others cannot go.",
      "url": "http://t.co/3PkAkcbfw9",
      "entities": {
        "url": {
          "urls": [
            {
              "url": "http://t.co/3PkAkcbfw9",
              "expanded_url": "http://cia.gov",
              "display_url": "cia.gov",
              "indices": [
                0,
                22
              ]
            }
          ]
        },
        "description": {
          "urls": []
        }
      },
      "protected": false,
      "followers_count": 2348135,
      "friends_count": 31,
      "listed_count": 9073,
      "created_at": "Mon Feb 24 19:08:11 +0000 2014",
      "favourites_count": 105,
      "utc_offset": null,
      "time_zone": null,
      "geo_enabled": false,
      "verified": true,
      "statuses_count": 3774,
      "lang": "en",
      "contributors_enabled": false,
      "is_translator": false,
      "is_translation_enabled": false,
      "profile_background_color": "000000",
      "profile_background_image_url": "http://abs.twimg.com/images/themes/theme14/bg.gif",
      "profile_background_image_url_https": "https://abs.twimg.com/images/themes/theme14/bg.gif",
      "profile_background_tile": false,
      "profile_image_url": "http://pbs.twimg.com/profile_images/474250448757481472/QcQ_P01E_normal.jpeg",
      "profile_image_url_https": "https://pbs.twimg.com/profile_images/474250448757481472/QcQ_P01E_normal.jpeg",
      "profile_banner_url": "https://pbs.twimg.com/profile_banners/2359926157/1401488215",
      "profile_link_color": "1B95E0",
      "profile_sidebar_border_color": "000000",
      "profile_sidebar_fill_color": "000000",
      "profile_text_color": "000000",
      "profile_use_background_image": false,
      "has_extended_profile": true,
      "default_profile": false,
      "default_profile_image": false,
      "following": false,
      "follow_request_sent": false,
      "notifications": false,
      "translator_type": "none"
    },
    "geo": null,
    "coordinates": null,
    "place": null,
    "contributors": null,
    "is_quote_status": false,
    "retweet_count": 310771,
    "favorite_count": 246692,
    "favorited": false,
    "retweeted": false,
    "lang": "en"
  }
}