- jruby --ng-server starts up a server. You can manage it however you like
- jruby --ng uses the Nailgun client instead of launching a new JVM for the command you run. You'll just need to run make in tool/nailgun to build the ng executable (already built for you on Windows).
Heres a sample session:
~/projects/jruby ➔ cd tool/nailgun/ ; make ; cd -
Building ng client. To build a Windows binary, type 'make ng.exe'
gcc -Wall -pedantic -s -O3 -o ng src/c/ng.c
ld warning: option -s is obsolete and being ignored
~/projects/jruby ➔ jruby --ng-server
NGServer started on all interfaces, port 2113.
+ Stopped jruby --ng-server
~/projects/jruby ➔ bg
+ jruby --ng-server &
~/projects/jruby ➔ jruby --ng -e "puts 1"
~/projects/jruby ➔ time jruby -e "puts 1"
~/projects/jruby ➔ time jruby --ng -e "puts 1"
Update: For those not familiar, "NailGun is a client, protocol, and server for running Java programs from the command line without incurring the JVM startup overhead. Programs run in the server (implemented in java), triggered by the client (written in C), which handles all I/O."
Update 2: It's been brought to my attention that we no longer ship a pre-configured Makefile for the ng client, so your build command line should actually look like:
~/projects/jruby ➔ cd tool/nailgun/ ; ./configure ; make ; cd -
Alternatively, you can run "ant build-ng" in the JRuby root, which will do largely the same thing for you using Ant.