naruse	2015-12-12 17:06:18 +0900 (Sat, 12 Dec 2015)

  New Revision: 53049

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=53049

  Log:
    add insight about parallel test-all
    
    see also https://bugs.ruby-lang.org/projects/ruby/wiki/DeveloperHowto

  Modified files:
    trunk/common.mk
Index: common.mk
===================================================================
--- common.mk	(revision 53048)
+++ common.mk	(revision 53049)
@@ -1085,7 +1085,7 @@ help: PHONY https://github.com/ruby/ruby/blob/trunk/common.mk#L1085
 	"  gdb-ruby:        runs test.rb by ruby under gdb" \
 	"  check:           equals make test test-all" \
 	"  test:            ruby core tests" \
-	"  test-all:        all ruby tests [TESTS=<test files>]" \
+	"  test-all:        all ruby tests [TESTS=\"-j4 <test files>\"]" \
 	"  test-rubyspec:   run RubySpec test suite" \
 	"  update-rubyspec: update local copy of RubySpec" \
 	"  benchmark:       benchmark this ruby and COMPARE_RUBY." \

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