* benchmark/gc/gcbench.rb: print HWM (high water mark) if possible.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43495 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Fri Nov  1 01:08:33 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* benchmark/gc/gcbench.rb: print HWM (high water mark) if possible.
+
 Thu Oct 31 21:48:31 2013  Kouhei Sutou  <kou@cozmixng.org>
 
 	* lib/rexml/parsers/streamparser.rb: Add dependency file require.

benchmark/gc/gcbench.rb

@@ -25,6 +25,13 @@ puts script
 puts Benchmark::CAPTION
 puts tms
 puts "GC total time (sec): #{gc_time}"
+
+# show High-Water Mark on Linux
+if File.exist?('/proc/self/status') && /VmHWM:\s*(\d+.+)/ =~ File.read('/proc/self/status')
+  puts
+  puts "VmHWM: #{$1.chomp}"
+end
+
 puts
 puts "Summary of #{name} on #{desc}\t#{tms.real}\t#{gc_time}\t#{GC.count}"
 puts "         (real time in sec, GC time in sec, GC count)"