I’ve reported an Eclipse bug. Doesn’t look like their debugger has ever done quite the right thing, unless the behaviour of the JVM has changed significantly.
On 03/11/2014 15:33, "Christian Thalinger" <christian.thalin...@oracle.com> wrote: >Interesting. Thanks for digging deep. > >> On Oct 31, 2014, at 8:36 AM, MacGregor, Duncan (GE Energy Management) >><duncan.macgre...@ge.com> wrote: >> >> Okay, I now know why the JVM is stuck for so long, just not why Eclipse >>is >> doing what it does. >> >> At certain points during the loading of our application Eclipse will >>make >> a large number (upto 10000) jdwp classesForSignature requests, each of >> which causes the jdwp lib to trawl over a large number of classes >>(several >> 10s of thousands), resulting in upto a couple hundred million jvmti >> GetClassSignature calls, and is particularly pointless because it fails >>to >> find any of these classes. >> >> That last bit gave me a clue. These large numbers of classesForSignature >> requests occur when classes have been GCed, and a request is being >>issued >> for every single class that has been successfully Gced. Since we¹re >> careful to ensure that all the code we dynamically execute at startup is >> done in temporary class loaders so that the everything can be Gced away, >> and since variance LF stuff can also be Gced, the problem is much worse >> than it would be in other applications. >> >> It¹s really bad in earlier 8 updates without the LF editor work because >> there¹s more classes and more getting Gced, so I¹ve seen 3 minute long >> pauses with that version. >> >> I guess this should be reported as a bug to the Eclipse debug team, but >>I >> wonder if classesForSignature can¹t be made faster in some way. >> >> Regards, Duncan. >> >> _______________________________________________ >> mlvm-dev mailing list >> mlvm-dev@openjdk.java.net >> http://mail.openjdk.java.net/mailman/listinfo/mlvm-dev > >_______________________________________________ >mlvm-dev mailing list >mlvm-dev@openjdk.java.net >http://mail.openjdk.java.net/mailman/listinfo/mlvm-dev _______________________________________________ mlvm-dev mailing list mlvm-dev@openjdk.java.net http://mail.openjdk.java.net/mailman/listinfo/mlvm-dev
