shilov · January 27, 2012 23:01 · Jan 27, 2012
diff --git a/redis_json_marshal_eval_benchmarks.rb b/redis_json_marshal_eval_benchmarks.rb
@@ -0,0 +1,88 @@
+# http://forrst.com/posts/JSON_vs_Marshal_vs_eval_Which_is_the_fastest_fo-6Qy
+
+require 'benchmark'
+require 'json'
+require 'redis'
+
+# -----------------
+
+puts "Initialize variables.."
+
+# Initialize connection to Redis via unix socket
+redis = Redis.new(path: '/tmp/redis.sock')
+
+# Generate array containing nested hashes with random integers, ex: { 1931 => { 9159 => 9366 }, 'stringkey' => 'stringvalue' }
+hashes = []
+100000.times do |i|
+  hashes[i] = { Random.rand(1..100) => { Random.rand(1..100) => Random.rand(1..100) }, 'stringkey' => 'stringvalue' }
+end
+
+puts '-----------------'
+
+puts "Benchmark converting and inserting to Redis\n\n"
+
+# Benchmark converting all the generated hashes into Redis
+Benchmark.bm(20) do |x|
+  # Convert to json
+  x.report('to_json:') {  hashes.each { |h| redis.set 'hash:j', h.to_json }  }
+  # "{\"1931\":{\"9159\":9366},\"stringkey\":\"stringvalue\"}"
+
+  # Convert to bytestream
+  x.report('Marshal.dump:') {  hashes.each { |h| redis.set 'hash:m', Marshal.dump(h) }  }
+  # "\x04\b{\ai\x02\x8B\a{\x06i\x02\xC7#i\x02\x96$I\"\x0Estringkey\x06:\x06EFI\"\x10stringvalue\x06;\x00F"
+
+  # Convert to string
+  x.report('hash.to_s:') {  hashes.each { |h| redis.set 'hash:s', h } }
+  # "{1931=>{9159=>9366}, \"stringkey\"=>\"stringvalue\"}"
+end
+
+puts '-----------------'
+
+puts "Retrieve from Redis to compare\n\n"
+
+# Retrieve from Redis
+rawjson = redis.get 'hash:j'
+rawbytestream = redis.get 'hash:m'
+rawstring = redis.get 'hash:s'
+
+# Convert back to a hash object
+json = JSON.parse(rawjson)
+bytestream = Marshal.restore(rawbytestream)
+string = eval(rawstring)
+
+puts "json == bytestream: #{json == bytestream}" # FALSE
+puts "string == bytestream: #{string == bytestream}" # TRUE
+
+puts '-----------------'
+
+puts "Benchmark retrieving from Redis and converting back to a hash\n\n"
+
+# Benchmark converting the hash 100000 times
+Benchmark.bm(20) do |x|
+  x.report('JSON.parse') { 100000.times { JSON.parse(redis.get 'hash:j') } }
+  x.report('Marshal.restore') { 100000.times { Marshal.restore(redis.get 'hash:m') } }
+  x.report('eval(string)') { 100000.times { eval(redis.get 'hash:s') } }
+end
+# 
+# 
+# 
+# Initialize variables..
+# -----------------
+# Benchmark converting and inserting to Redis
+# 
+#                            user     system      total        real
+# to_json:               4.380000   1.060000   5.440000 (  6.570592)
+# Marshal.dump:          2.870000   1.030000   3.900000 (  5.021693)
+# hash.to_s:             2.890000   1.010000   3.900000 (  4.997409)
+# -----------------
+# Retrieve from Redis to compare
+# 
+# json == bytestream: false
+# string == bytestream: true
+# -----------------
+# Benchmark retrieving from Redis and converting back to a hash
+# 
+#                            user     system      total        real
+# JSON.parse             3.440000   1.070000   4.510000 (  5.497154)
+# Marshal.restore        3.130000   1.050000   4.180000 (  5.163987)
+# eval(string)           5.130000   1.140000   6.270000 (  7.270163)
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