Customizing Graal for JRuby

gistfile1.txt

~/projects/jruby $ echo $JRUBY_GRAAL
-Xfixnum.cache=false -J-XX:+UnlockExperimentalVMOptions -J-XX:+EnableJVMCI -J-XX:+UseJVMCICompiler -J-Djvmci.Compiler=jruby-graal -J-Xbootclasspath/a:/usr/lib/jvm/jdk8-jvmci/jre/lib/jvmci/jvmci-api.jar:/usr/lib/jvm/jdk8-jvmci/jre/lib/jvmci/jvmci-hotspot.jar:/usr/lib/jvm/graalvm/lib/graal/graal.jar -Xcompile.invokedynamic

~/projects/jruby $ jruby mandelbrot.rb 
1.568706
1.263336
1.2612649999999999
1.185973
1.188513
1.196141
1.1832500000000001
1.1738950000000001
1.1787750000000001
1.1836799999999998
1.177073
1.173415
1.165675
1.1799030000000001
1.167859
1.18124
1.1891969999999998
1.169011
1.171051
1.17486

~/projects/jruby $ jruby -Xcompile.invokedynamic mandelbrot.rb 
1.237169
0.7084459999999999
0.6838650000000001
0.659342
0.745088
0.6648620000000001
0.649168
0.6505540000000001
0.648953
0.639765
0.653462
0.64859
0.645602
0.629986
0.632386
0.628902
0.635348
0.6331100000000001
0.6336080000000001
0.626798

~/projects/jruby $ jruby $JRUBY_GRAAL mandelbrot.rb 
0.737211
0.427491
0.072004
0.075777
0.10040600000000001
0.109073
0.11461500000000001
0.112447
0.073181
0.080539
0.073155
0.072808
0.07056499999999999
0.073722
0.073304
0.08178400000000001
0.072471
0.07209099999999999
0.07018600000000001
0.07152

What's the modification? Was it something about disabling identity for your Fixnum box objects?