Startup times for base and loading ActiveRecord on JDK7 an JDK8 with various flags

gistfile1.txt

Java 7 does not currently have tiered compilation on by default, and we do not enable invokedynamic.

Default settings (no indy, no tiered)

system ~/projects/jruby $ (pickjdk 4 ; time jruby -e 1)
New JDK: jdk1.7.0_07.jdk

real	0m1.255s
user	0m1.953s
sys	0m0.084s

No indy, tiered

system ~/projects/jruby $ (pickjdk 4 ; time jruby -J-XX:+TieredCompilation -e 1)
New JDK: jdk1.7.0_07.jdk

real	0m1.047s
user	0m2.315s
sys	0m0.137s

No indy, stop at tier 1 (-client, basically)

system ~/projects/jruby $ (pickjdk 4 ; time jruby -J-XX:+TieredCompilation -J-XX:TieredStopAtLevel=1 -e 1)
New JDK: jdk1.7.0_07.jdk

real	0m0.891s
user	0m1.122s
sys	0m0.097s

With indy, no tiered

system ~/projects/jruby $ (pickjdk 4 ; time jruby -Xcompile.invokedynamic=true -e 1)
New JDK: jdk1.7.0_07.jdk

real	0m1.286s
user	0m2.044s
sys	0m0.090s

With indy, tiered

system ~/projects/jruby $ (pickjdk 4 ; time jruby -Xcompile.invokedynamic=true -J-XX:+TieredCompilation -e 1)
New JDK: jdk1.7.0_07.jdk

real	0m1.113s
user	0m2.508s
sys	0m0.139s

With indy, tiered stop at level 1

system ~/projects/jruby $ (pickjdk 4 ; time jruby -Xcompile.invokedynamic=true -J-XX:+TieredCompilation -J-XX:TieredStopAtLevel=1 -e 1)
New JDK: jdk1.7.0_07.jdk

real	0m0.938s
user	0m1.252s
sys	0m0.105s

Loading active_record with default config

system ~/projects/jruby $ (pickjdk 4 ; time jruby -e "require 'active_record'")
New JDK: jdk1.7.0_07.jdk

real	0m2.701s
user	0m5.844s
sys	0m0.173s

Loading active_record with tiered

system ~/projects/jruby $ (pickjdk 4 ; time jruby -J-XX:+TieredCompilation -e "require 'active_record'")
New JDK: jdk1.7.0_07.jdk

real	0m2.173s
user	0m7.289s
sys	0m0.298s

Loading active_record with tiered stop at level 1

system ~/projects/jruby $ (pickjdk 4 ; time jruby -J-XX:+TieredCompilation -J-XX:TieredStopAtLevel=1 -e "require 'active_record'")
New JDK: jdk1.7.0_07.jdk

real	0m1.524s
user	0m2.301s
sys	0m0.168s

Java 8 has tiered compilation on by default and we enable invokedynamic

Default (with indy, with tiered)

system ~/projects/jruby $ (pickjdk 5 ; time jruby -e 1)
New JDK: jdk1.8.0.jdk

real	0m0.924s
user	0m2.002s
sys	0m0.110s

Tiered stop at level 1

system ~/projects/jruby $ (pickjdk 5 ; time jruby -J-XX:TieredStopAtLevel=1 -e 1)
New JDK: jdk1.8.0.jdk

real	0m0.832s
user	0m1.047s
sys	0m0.088s

Loading active_record with tiered

system ~/projects/jruby $ (pickjdk 5 ; time jruby -e "require 'active_record'")
New JDK: jdk1.8.0.jdk

real	0m2.816s
user	0m9.832s
sys	0m0.343s

Loading active_record with tiered stop at 1

system ~/projects/jruby $ (pickjdk 5 ; time jruby -J-XX:TieredStopAtLevel=1 -e "require 'active_record'")
New JDK: jdk1.8.0.jdk

real	0m1.895s
user	0m2.960s
sys	0m0.203s

Loading active_record with indy disabled

system ~/projects/jruby $ (pickjdk 5 ; time jruby -Xcompile.invokedynamic=false -e "require 'active_record'")
New JDK: jdk1.8.0.jdk

real	0m2.212s
user	0m7.687s
sys	0m0.298s

Loading active_record with indy disabled and tiered stop at level 1

system ~/projects/jruby $ (pickjdk 5 ; time jruby -Xcompile.invokedynamic=false -J-XX:TieredStopAtLevel=1 -e "require 'active_record'")
New JDK: jdk1.8.0.jdk

real	0m1.526s
user	0m2.344s
sys	0m0.167s

Loading base with indy disabled, tiered

system ~/projects/jruby $ (pickjdk 5 ; time jruby -Xcompile.invokedynamic=false -e 1)
New JDK: jdk1.8.0.jdk

real	0m0.850s
user	0m1.753s
sys	0m0.109s

Loading base with indy disabled, tiered stop at level 1

system ~/projects/jruby $ (pickjdk 5 ; time jruby -Xcompile.invokedynamic=false -J-XX:TieredStopAtLevel=1 -e 1)
New JDK: jdk1.8.0.jdk

real	0m0.747s
user	0m0.914s
sys	0m0.082s