proper usage of -XX:+PrintIdeal

[Manohar Jonnalagedda]

Hi Krystal,

thanks for the reply. I will post this on the hotspot-compiler-dev list as
well. Here is the link :
http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2011-November/006782.html


> Your command line arguments looks okay to me. I tried it on a fastdebug
> build of HotSpot 20.0-b11 and it worked fine. Is it that the file.xml is
> empty, or is it the particular method that you're after doesn't exist in
> "file.xml"? For the latter case, did you see a "file1.xml" in the same
> directory? Does it contain the method you're after?
>

I am using 20.0-b17 of the fastdebug build. I do have two files as well,
file.xml and file1.xml, and neither contain the method I am looking for. I
only have details for 4 methods, one of them being a decodeArrayLoop and
the others being methods from the API (file input and string manipulation
methods). Is it possible that methodA would not be JIT compiled following
the extra instrumentation overhead?

Cheers,
Manohar


>
> - Kris
>
>
> On Fri, Nov 25, 2011 at 12:57 AM, Manohar Jonnalagedda <
> manojo10386 at gmail.com> wrote:
>
>> Hello all,
>>
>> I am new to using the debug features of hotspot (probably posting to the
>> wrong list, as I haven't seen any list targetted to hotspot users), and was
>> interested in checking out the graph of a program that I wrote. The program
>> contains a method 'methodA' which I would like to inspect in terms of
>> optimizations performed. I verified using the PrintCompilation (and
>> PrintAssembly) flag that it was indeed JIT compiled.
>>
>> When I use the PrintIdeal flags, however, my output xml files do not
>> contain any mention of this method. Here is the command I use :
>>
>> $JAVA_HOME/bin/java -verbose:gc -server -d64 -XX:+UseCompressedOops
>> -XX:+DoEscapeAnalysis -XX:PrintIdealGraphLevel=1
>> -XX:PrintIdealGraphFile="file.xml" -XX:+PrintIdeal $JAVA_OPTS "$@"
>>
>> Would the problem be due to not using the flags properly?
>>
>> Thanks a lot for your help,
>> Manohar
>>
>>
> What version of HotSpot are you using? And, I assume you are using a
fastdebug build, right? Otherwise the PrintIdeal* arguments won't even be
accepted at VM start.
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