Add micro benchmarks for TruffleRuby::ConcurrentMap

Author: eregon

bench/micro/truffleruby/concurrent_map.rb

@@ -0,0 +1,30 @@
+# Copyright (c) 2021 Oracle and/or its affiliates. All rights reserved. This
+# code is released under a tri EPL/GPL/LGPL license. You can use it,
+# redistribute it and/or modify it under the terms of the:
+#
+# Eclipse Public License version 2.0, or
+# GNU General Public License version 2, or
+# GNU Lesser General Public License version 2.1.
+
+if RUBY_ENGINE == 'truffleruby'
+  map = TruffleRuby::ConcurrentMap.new
+  10_000.times { |i| map[i] = i }
+  map[:a] = 1
+
+  benchmark 'TruffleRuby::ConcurrentMap#[]' do
+    map[:a]
+  end
+
+  benchmark 'TruffleRuby::ConcurrentMap#[]=' do
+    map[:set] = :value
+  end
+
+  benchmark 'TruffleRuby::ConcurrentMap#each_pair' do
+    map.each_pair { |k,v| k }
+  end
+
+  benchmark 'TruffleRuby::ConcurrentMap#delete' do
+    map[:to_delete] = true
+    map.delete(:to_delete)
+  end
+end