[jira] [Created] (GROOVY-8298) Slow Performance Caused by Invoke Dynamic

["Joseph Athman (JIRA)" <ji...@apache.org>]

Joseph Athman created GROOVY-8298:
-------------------------------------

             Summary: Slow Performance Caused by Invoke Dynamic
                 Key: GROOVY-8298
                 URL: https://issues.apache.org/jira/browse/GROOVY-8298
             Project: Groovy
          Issue Type: Bug
    Affects Versions: 2.4.12
            Reporter: Joseph Athman


I have been researching a problem my application is having where performance seems to be much slower than I would expect. After a lot of research I found GROOVY-6583 which seems to have the same symptoms (though not caused by the same method calls). After more research I found someone who reported a similar issue and created a [sample application|https://github.com/dwclark/deopt-storm] which reproduces the issue. I am seeing the same behavior he discusses which is that using the JIT probe I'm able to see that our production application is constantly uses a large amount of CPU on JIT activities for days on end, it never gets better. 

When doing a thread dump of our application we often see 20-50 threads all stuck on this same stack trace:


{code:none}
"qtp2078714399-360525": running, holding [771bcf60]
	at java.lang.invoke.MethodHandleNatives.setCallSiteTargetNormal(Native Method)
	at java.lang.invoke.CallSite.setTargetNormal(CallSite.java:258)
	at java.lang.invoke.MutableCallSite.setTarget(MutableCallSite.java:154)
	at org.codehaus.groovy.vmplugin.v7.Selector$MethodSelector.doCallSiteTargetSet(Selector.java:909)
	at org.codehaus.groovy.vmplugin.v7.Selector$MethodSelector.setCallSiteTarget(Selector.java:969)
	at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:228)
	at java.lang.invoke.LambdaForm$DMH/1665404403.invokeStatic_L3IL5_L(LambdaForm$DMH)
	at java.lang.invoke.LambdaForm$BMH/1828868503.reinvoke(LambdaForm$BMH)
	at java.lang.invoke.LambdaForm$reinvoker/1917025677.dontInline(LambdaForm$reinvoker)
	at java.lang.invoke.LambdaForm$MH/462773420.guard(LambdaForm$MH)
	at java.lang.invoke.LambdaForm$MH/1947020920.linkToCallSite(LambdaForm$MH)
{code}


No matter how long the application runs it will continue to show this behavior. From what I've read I think our code causes this problem because we run code that looks like this:

{code:java}
// List of objects will consistent of 2-20 instances of classes 
// which all implement the same interface which defines the runMethod. 
// Each concrete implementation will have it's own unique behavior
def resultList = listOfObjects*.runMethod()
{code}

It would be nice if Groovy could at least identify this situation and prevent itself from getting in to the de-opt storm.




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