testing various json parsing options

json_benchmarks.rb

require 'benchmark'
require 'google/protobuf'

pool = Google::Protobuf::DescriptorPool.new
pool.build do
  add_message "TestMessage" do
    optional :optional_int32,  :int32,        1
    optional :optional_int64,  :int64,        2
    optional :optional_uint32, :uint32,       3
    optional :optional_uint64, :uint64,       4
    optional :optional_bool,   :bool,         5
    optional :optional_float,  :float,        6
    optional :optional_double, :double,       7
    optional :optional_string, :string,       8
    optional :optional_bytes,  :bytes,        9
    optional :optional_msg,    :message,      10, "TestMessage2"

    repeated :repeated_int32,  :int32,        12
    repeated :repeated_int64,  :int64,        13
    repeated :repeated_uint32, :uint32,       14
    repeated :repeated_uint64, :uint64,       15
    repeated :repeated_bool,   :bool,         16
    repeated :repeated_float,  :float,        17
    repeated :repeated_double, :double,       18
    repeated :repeated_string, :string,       19
    repeated :repeated_bytes,  :bytes,        20
    repeated :repeated_msg,    :message,      21, "TestMessage2"
  end

  add_message "TestMessage2" do
    optional :foo, :int32, 1
  end
end

TestMessage = pool.lookup("TestMessage").msgclass
TestMessage2 = pool.lookup("TestMessage2").msgclass

tm = TestMessage.new
tm.repeated_string << 'ok1'
tm.repeated_string << 'ok2'
tm.optional_string = 'another string'
tm.optional_int32 = 102

raw_json = TestMessage.encode_json(tm)
raw_proto = TestMessage.encode(tm)
iters = 100_000
Benchmark.bm(12) do |b|
  b.report('.encode'){ iters.times{ TestMessage.encode(tm) } }
  b.report('.encode_json'){ iters.times{ TestMessage.encode_json(tm) } }
  b.report('.decode'){ iters.times{ TestMessage.decode(raw_proto) } }
  # this is broken on master when running jruby; so skipping
  # b.report('.decode_json'){ TestMessage.decode_json(raw_json) }
end; nil

results.txt

# MRI 2.2.0
#
# using stdlib JSON; gem JSON returned comperable results
                   user     system      total        real
.encode        0.180000   0.000000   0.180000 (  0.178334)
.encode_json   4.010000   0.010000   4.020000 (  4.063277)
.decode        0.870000   0.010000   0.880000 (  0.889392)

# using Yajl
                   user     system      total        real
.encode        0.170000   0.000000   0.170000 (  0.173894)
.encode_json   3.410000   0.030000   3.440000 (  3.486852)
.decode        0.900000   0.010000   0.910000 (  0.919666)

# using upb (default)
.encode        0.210000   0.010000   0.220000 (  0.208851)
.encode_json   0.380000   0.000000   0.380000 (  0.390611)
.decode        0.920000   0.020000   0.940000 (  0.945698)