Dumping graphs on the command line

[Alexander Senier]

Hi Doug,

thanks, that was very helpful to put me on the right track. I found that
-XX:-TieredCompilation in combination with -Xcomp (and a lot of patience
;-) results in all intersting methods being dumped.

Cheers,
Alex

On 06/02/2017 01:13 PM, Doug Simon wrote:
> Hi Alex,
> 
> Graphs will only be dumped for methods compiled by Graal. Most likely, your example is small enough that it never reaches the top tier compiler. To force a method to be compiled by Graal, you need to either make sure it's hot (e.g., by placing calls to it in a loop with many iterations) or use -XX:CompileOnly[1]. The former is usually a better approach since you'll get a compilation with a more realistic profile. To see what is being compiled by Graal, use either the -XX:+PrintCompilation or -Dgraal.PrintCompilation=true options (the latter shows C1 compilations as well). To restrict compilation only to Graal, use -XX:-TieredCompilation. As you're probably aware, you need -XX:+UseJVMCICompiler in all cases.
> 
> -Doug
> 
> [1] https://docs.oracle.com/javase/8/docs/technotes/tools/unix/java.html
> 
>> On 2 Jun 2017, at 12:45, Alexander Senier <alexander.senier at tu-dresden.de> wrote:
>>
>> Hi all,
>>
>> I'm looking into Graal to create data flow graphs from Java programs.
>> Following the info from the repository I successfully got graphs in IGV
>> from the unittests (Linux, version 0.23 from the website):
>>
>> $ JAVA_HOME=../../labsjdk1.8.0_121-jvmci-0.26/ ../../mx/mx igv&
>> $ PATH=/opt/graalvm-0.23/bin:$PATH
>> JAVA_HOME=../../labsjdk1.8.0_121-jvmci-0.26/ ../../mx/mx unittest
>> -Dgraal.Dump= -Dgraal.PrintCFG=true BC_aload
>>
>> I see the graphs in IGV as well as the CFGPrinter log output.
>> Subsequently, I tried to get the same graphs for a custom example:
>>
>> $ /opt/graalvm-0.23/bin/javac  DH.java
>> $ /opt/graalvm-0.23/bin/java -Dgraal.Dump= -Dgraal.PrintCFG=true
>> -XX:+UseJVMCICompiler DH
>>
>> While the program is compiled and run, no graphs are generated in IGV
>> nor do I see any log files. I see no graal related messages either.
>>
>> What is the canonical way to dump graphs from a compilation, preferably
>> on the Linux command line?
>>
>> Thanks!
>>
>> Cheers,
>> Alex
>>
>> -- 
>> Dipl.-Inf. Alexander Senier
>> Scientific Assistant
>>
>> TU Dresden
>> Faculty of Computer Science
>> Institute of System Architecture
>> Chair of Privacy and Data Security
>> 01062 Dresden
>>
>> Tel.: +49 351 463-38719
>> Fax : +49 351 463-38255
> 

-- 
Dipl.-Inf. Alexander Senier
Scientific Assistant

TU Dresden
Faculty of Computer Science
Institute of System Architecture
Chair of Privacy and Data Security
01062 Dresden

Tel.: +49 351 463-38719
Fax : +49 351 463-38255