[
https://issues.apache.org/jira/browse/NETBEANS-1593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16679890#comment-16679890
]
Martin Entlicher commented on NETBEANS-1593:
--------------------------------------------
Further examination revealed that the dramatic performance regression is caused
by inactive compilation.
1. When the "Toggle Pause in GraalVM Script" is used to enter eval, then:
* two compiler threads are started, "TruffleCompilerThread-20" and
"TruffleCompilerThread-21",
* 6 compilation jobs are performed
2. When the "Step into" is used to enter eval, then:
* one compiler thread is started only, "TruffleCompilerThread-20",
* 1 compilation job is performed
These are symptoms of something that was apparently broken by stepping through
the initial language execution, but it's not clear yet what's that.
These are indication that this is a bug in the platform (JDK/GraalVM), not in
NetBeans, IMHO. Further investigation is necessary.
> Debugging slows down JavaScript execution 20x times
> ---------------------------------------------------
>
> Key: NETBEANS-1593
> URL: https://issues.apache.org/jira/browse/NETBEANS-1593
> Project: NetBeans
> Issue Type: Bug
> Components: debugger - Java
> Affects Versions: 10.0
> Reporter: Jaroslav Tulach
> Assignee: Martin Entlicher
> Priority: Major
>
> While working on
> [PR-4|https://github.com/graalvm/graal-js-jdk11-maven-demo/pull/4] I realized
> that Truffle debugger support in NetBeans slows down execution 20x times.
> Without debugger the benchmark can execute in 150ms. With debugger it takes
> more than 3s. At current state the great Truffle debugging feature is not
> suitable for a demo.
> To reproduce, you need:
> * NetBeans 10 VC2
> * JDK11
> *
> [graal-js-jdk11-maven-demo|https://github.com/graalvm/graal-js-jdk11-maven-demo]
> at revision 2f851ca6d922
> Then you can debug the {{AppTest}} unit test and put a breakpoint to calls to
> {{eval}}, etc. Once the breakpoint is hit, remove it and continue. The rest
> of the execution will be slow - e.g. take more than 3s for each round.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: commits-unsubscr...@netbeans.apache.org
For additional commands, e-mail: commits-h...@netbeans.apache.org
For further information about the NetBeans mailing lists, visit:
https://cwiki.apache.org/confluence/display/NETBEANS/Mailing+lists
