Java 7 update 12 issue with MethodHandles.catchException.

[MacGregor, Duncan (GE Energy Management)]

Thanks. Meanwhile I've patched the two offending parts of the database library to work round the problem. Although our benchmarks run quite nicely on 7u12 and 8 (give or take a couple of slowdowns) full applications really aren't performing well right now.

Startup time on 7u12 has increased by somewhere between 50 and 70%, which seems to be due to the new LambdaForm infrastructure being slower on initialisation/initial calls. That isn't great but is something I think we can live with and will probably push us to look at ways of improving overall startup time.

The large number of LamdbaForms created means permgen usage has increased substantially – it was over 300MB by the time the applications has started.

Compilation never really settles down during use of the app. I'll look into this (I don't think it ever really settled down on 7u9 either but performance was considerably better).

I'm going to try running everything with PrintCompilation and LogCompilation to try and work out why compilation isn't settling down and narrow the problem down.

From: John Rose <john.r.rose at oracle.com<mailto:john.r.rose at oracle.com>>
Reply-To: Da Vinci Machine Project <mlvm-dev at openjdk.java.net<mailto:mlvm-dev at openjdk.java.net>>
Date: Wednesday, 12 December 2012 19:42
To: Da Vinci Machine Project <mlvm-dev at openjdk.java.net<mailto:mlvm-dev at openjdk.java.net>>
Subject: Re: Java 7 update 12 issue with MethodHandles.catchException.

On Dec 12, 2012, at 11:33 AM, Christian Thalinger wrote:

That helps.  I can't recall code that has a "8 argument limitation" and does something else with 9+.  Maybe John has an idea.

The bug is probably in GuardWithCatch.invoke_V, in this file:
  http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/tip/src/share/classes/java/lang/invoke/MethodHandleImpl.java

I'll look into it.

— John