feat: add benchmark for multi_thread

benchmarks/multi_thread_comporess.rb

@@ -0,0 +1,25 @@
+require 'benchmark/ips'
+$LOAD_PATH.unshift '../lib'
+require 'json'
+require 'objspace'
+require 'zstd-ruby'
+require 'thread'
+
+GUESSES = (ENV['GUESSES'] || 1000).to_i
+THREADS = (ENV['THREADS'] || 1).to_i
+
+p GUESSES: GUESSES, THREADS: THREADS
+
+sample_file_name = ARGV[0]
+json_string = File.read("./samples/#{sample_file_name}")
+
+queue = Queue.new
+GUESSES.times { queue << json_string }
+THREADS.times { queue << nil }
+THREADS.times.map {
+  Thread.new {
+    while str = queue.pop
+      Zstd.compress(str)
+    end
+  }
+}.each(&:join)