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  How to check whether scalar replacement worked?  (Read 1367 times)
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Offline krausest

Junior Member


Exp: 15 years


I love YaBB 1G - SP1!


« Posted 2012-01-16 20:17:18 »

Scalar replacement in the jvm is pretty cool, but my problem is that I don't know an easy way to check if and where it works. Does anyone have an idea how to check whether an allocation has been replaced?
So far the only way I found is to run a stress test for the method in question with "-verbose:gc" and see if the gc runs less often.
Any better ideas?

Thanks,
Stefan
Offline Spasi
« Reply #1 - Posted 2012-01-16 21:42:05 »

You'll need a debug VM and these flags:

-XX:+UnlockDiagnosticVMOptions
-XX:+PrintEscapeAnalysis
-XX:+PrintEliminateAllocations
Offline krausest

Junior Member


Exp: 15 years


I love YaBB 1G - SP1!


« Reply #2 - Posted 2012-01-16 22:21:52 »

Very cool - thanks. A debug VM used to be available for pre-release JDKs, but I don't find it anymore for JDK 8 or JDK 7u4. Do you build it yourself or is it still available for download?
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Offline Spasi
« Reply #3 - Posted 2012-01-17 09:09:57 »

I use an old build atm. I couldn't find a recent one either, seems they're not available anymore.
Offline ra4king

JGO Kernel


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« Reply #4 - Posted 2012-01-17 09:30:59 »

Very cool - thanks. A debug VM used to be available for pre-release JDKs, but I don't find it anymore for JDK 8 or JDK 7u4. Do you build it yourself or is it still available for download?
WHOA! So are you like...from the future?! O_O

Offline theagentd
« Reply #5 - Posted 2012-01-17 10:54:31 »

Very cool - thanks. A debug VM used to be available for pre-release JDKs, but I don't find it anymore for JDK 8 or JDK 7u4. Do you build it yourself or is it still available for download?
WHOA! So are you like...from the future?! O_O
WILL THE GREAT TOKYO EARTHQUAKE STRIKE BEFORE JUNE THIS YEAR?!

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