Add a warning for enabling ObjectSpace at runtime. Fixes #3478.

jruby · Nov 20, 2015 · da88890 · da88890
1 parent 07d50d1
commit da88890
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/core/src/main/java/org/jruby/ext/jruby/JRubyUtilLibrary.java b/core/src/main/java/org/jruby/ext/jruby/JRubyUtilLibrary.java
@@ -76,6 +76,9 @@ public static IRubyObject getObjectSpaceEnabled(IRubyObject recv) {
     @JRubyMethod(name = "objectspace=", module = true)
     public static IRubyObject setObjectSpaceEnabled(IRubyObject recv, IRubyObject arg) {
         Ruby runtime = recv.getRuntime();
+        if (arg.isTrue()) {
+            runtime.getWarnings().warn("ObjectSpace impacts performance. See http://wiki.jruby.org/PerformanceTuning#dont-enable-objectspace");
+        }
         runtime.setObjectSpaceEnabled(arg.isTrue());
         return runtime.getNil();
     }