AppEngine JRuby - OutOfMemoryError：Java 堆空间 - 可以解决吗？

Question

我使用 AppEngine JRuby on Rails（SDK 版本 1.3.3.1） - 我经常遇到的一个问题是，在几次请求之后，服务器变得非常慢，直到它死掉并在终端（OSX）上抛出 OutOfMemoryError 。

请求本身非常轻量级，只不过是使用 DataMapper 查找实体或保存它。

在appspot上，这个问题没有发生。

有没有办法扩大JRuby的堆空间？

异常日志：

    Exception in thread "Timer-2" java.lang.OutOfMemoryError: Java heap space
Apr 29, 2010 8:08:22 AM com.google.apphosting.utils.jetty.JettyLogger warn
WARNING: Error for /users/close_users
java.lang.OutOfMemoryError: Java heap space
    at org.jruby.RubyHash.internalPut(RubyHash.java:480)
    at org.jruby.RubyHash.internalPut(RubyHash.java:461)
    at org.jruby.RubyHash.fastASet(RubyHash.java:837)
    at org.jruby.RubyArray.makeHash(RubyArray.java:2998)
    at org.jruby.RubyArray.makeHash(RubyArray.java:2992)
    at org.jruby.RubyArray.op_diff(RubyArray.java:3103)
    at org.jruby.RubyArray$i_method_1_0$RUBYINVOKER$op_diff.call(org/jruby/RubyArray$i_method_1_0$RUBYINVOKER$op_diff.gen)
    at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:146)
    at org.jruby.ast.CallOneArgNode.interpret(CallOneArgNode.java:57)
    at org.jruby.ast.LocalAsgnNode.interpret(LocalAsgnNode.java:123)
    at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:104)
    at org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
    at org.jruby.runtime.InterpretedBlock.evalBlockBody(InterpretedBlock.java:373)
    at org.jruby.runtime.InterpretedBlock.yield(InterpretedBlock.java:346)
    at org.jruby.runtime.InterpretedBlock.yield(InterpretedBlock.java:303)
    at org.jruby.runtime.Block.yield(Block.java:194)
    at org.jruby.RubyArray.collect(RubyArray.java:2354)
    at org.jruby.RubyArray$i_method_0_0$RUBYFRAMEDINVOKER$collect.call(org/jruby/RubyArray$i_method_0_0$RUBYFRAMEDINVOKER$collect.gen)
    at org.jruby.runtime.callsite.CachingCallSite.callBlock(CachingCallSite.java:115)
    at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:122)
    at org.jruby.ast.CallNoArgBlockNode.interpret(CallNoArgBlockNode.java:64)
    at org.jruby.ast.CallNoArgNode.interpret(CallNoArgNode.java:61)
    at org.jruby.ast.LocalAsgnNode.interpret(LocalAsgnNode.java:123)
    at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:104)
    at org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
    at org.jruby.ast.EnsureNode.interpret(EnsureNode.java:98)
    at org.jruby.ast.BeginNode.interpret(BeginNode.java:83)
    at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:104)
    at org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
    at org.jruby.ast.EnsureNode.interpret(EnsureNode.java:96)
    at org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:201)
    at org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:183)

Answer 1

设置 -XX:MaxHeapSize 和 -Xmx 虚拟机参数