[jira] [Created] (NETBEANS-1185) Application extremely slow under debugger, then freezes

["Hendi (JIRA)" <ji...@apache.org>]

Hendi created NETBEANS-1185:
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             Summary: Application extremely slow under debugger, then freezes
                 Key: NETBEANS-1185
                 URL: https://issues.apache.org/jira/browse/NETBEANS-1185
             Project: NetBeans
          Issue Type: Bug
          Components: debugger - Java
    Affects Versions: 9.0
         Environment: Windows 10 x64 (1709), JDK 10.0.2, Core i7 6700K, 16 GB RAM
            Reporter: Hendi


I have a rather large Java project with over 600 source files. It is a console application, no GUI code. At startup it loads a lot of data (among other things it memory-maps some files that are around ~500 MB). When left unconstrained, it uses around 1.1 GB of memory once it is done, but it also works fine with -Xmx768M. When not running under a debugger, it takes around 1 minute to complete loading.

When launching it using NetBeans' debugger, however, it never completes. It will load for around 5 minutes (at which point it still isn't even half done..), then CPU usage for the process goes to 0% and netbeans64 sits at 12.5% (seems like a single thread running a spin loop or so). I use the current release version of NetBeans 9 running under JDK 10.0.2.

When I was still using NetBeans 8.2 with JDK 8, it was fine. Debugging was only marginally slower than launching it without a debugger.



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