This is a little bit strange (some suites run more that 50% faster using jdk6u10 !):

using jdk6u4:

run-junit-compiled:
[echo] compile=JIT, jit.threshold=0, jit.max=-1, objectspace=true threadpool=false reflection=false version=ruby1_8
   [junit] Testsuite: org.jruby.test.MainTestSuite
   [junit] Tests run: 240, Failures: 0, Errors: 0, Time elapsed: 48,344 sec
   [junit]
   [junit] Testsuite: org.jruby.test.ScriptTestSuite
   [junit] Tests run: 77, Failures: 0, Errors: 0, Time elapsed: 57,235 sec
   [junit]
   [junit] Testsuite: org.jruby.test.BFTSTestSuite
   [junit] Tests run: 10, Failures: 0, Errors: 0, Time elapsed: 3,14 sec
   [junit]
   [junit] Testsuite: org.jruby.test.JRubyTestSuite
   [junit] Tests run: 59, Failures: 0, Errors: 0, Time elapsed: 30,578 sec
   [junit]
   [junit] Testsuite: org.jruby.test.MRITestSuite
   [junit] Tests run: 38, Failures: 0, Errors: 0, Time elapsed: 21,453 sec
   [junit]
   [junit] Testsuite: org.jruby.test.RubiconTestSuite
   [junit] Tests run: 44, Failures: 0, Errors: 0, Time elapsed: 12,781 sec
   [junit]
   [junit] Testsuite: org.jruby.test.RubyTestTestSuite
   [junit] Tests run: 223, Failures: 0, Errors: 0, Time elapsed: 15,39 sec
   [junit]
   [junit] Testsuite: org.jvyamlb.YAMLLoadTest
   [junit] Tests run: 8, Failures: 0, Errors: 0, Time elapsed: 0,031 sec
   [junit]
   [junit] Testsuite: org.jvyamlb.YAMLDumpTest
   [junit] Tests run: 6, Failures: 0, Errors: 0, Time elapsed: 0,015 sec

BUILD SUCCESSFUL
Total time: 4 minutes 20 seconds


using jdk6u10 (from openjdk page):

run-junit-compiled:
[echo] compile=JIT, jit.threshold=0, jit.max=-1, objectspace=true threadpool=false reflection=false version=ruby1_8
   [junit] Testsuite: org.jruby.test.MainTestSuite
   [junit] Tests run: 240, Failures: 0, Errors: 0, Time elapsed: 33,11 sec
   [junit]
   [junit] Testsuite: org.jruby.test.ScriptTestSuite
   [junit] Tests run: 77, Failures: 0, Errors: 0, Time elapsed: 37,656 sec
   [junit]
   [junit] Testsuite: org.jruby.test.BFTSTestSuite
   [junit] Tests run: 10, Failures: 0, Errors: 0, Time elapsed: 3,125 sec
   [junit]
   [junit] Testsuite: org.jruby.test.JRubyTestSuite
   [junit] Tests run: 59, Failures: 0, Errors: 0, Time elapsed: 14,703 sec
   [junit]
   [junit] Testsuite: org.jruby.test.MRITestSuite
   [junit] Tests run: 38, Failures: 0, Errors: 0, Time elapsed: 9,735 sec
   [junit]
   [junit] Testsuite: org.jruby.test.RubiconTestSuite
   [junit] Tests run: 44, Failures: 0, Errors: 0, Time elapsed: 9,61 sec
   [junit]
   [junit] Testsuite: org.jruby.test.RubyTestTestSuite
   [junit] Tests run: 223, Failures: 0, Errors: 0, Time elapsed: 13,375 sec
   [junit]
   [junit] Testsuite: org.jvyamlb.YAMLLoadTest
   [junit] Tests run: 8, Failures: 0, Errors: 0, Time elapsed: 0,016 sec
   [junit]
   [junit] Testsuite: org.jvyamlb.YAMLDumpTest
   [junit] Tests run: 6, Failures: 0, Errors: 0, Time elapsed: 0 sec

BUILD SUCCESSFUL
Total time: 2 minutes 46 seconds

Benchmarks are not affected THAT much though.

Marcin.

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