[Sablevm-developer] JGFSyncBench fails

[Chris P. <chr...@ma...>]

Hi,

I'm trying to get some basic multithreading benchmarks to run with 
recent stagings (sablevm@1503 + sablevm-classpath@1509), but a seemingly 
simple one always fails (it works with Sun's java-1.4.1).  I did not try 
older builds with this benchmark, but Bruno's RollerCoaster was failing 
with the switch interpreter as well and that was why I upgraded to 
staging (it no longer fails).

I'm trying to run JGFSyncBench in section1 of the multithreaded Java 
Grande Forum Benchmarks:

http://www.epcc.ed.ac.uk/computing/research_activities/java_grande/index_1.html

I would like to try and fix this bug, but seeing as I have until now 
been primarily fixing problems with my own stuff, I need some pointers 
as to what needs to be fixed (I am not familiar with the written code, 
and concurrency problems are not exactly fun to debug), confirmation 
that it also fails for you, at least some of the time, and maybe 
suggestions as to how to fix this (if you have them).  Other mt 
benchmarks seem to be working okay (not all with my spmt stuff, e.g. 
RollerCoaster still fails, but that's possibly a separate issue).

The JGFSyncBench benchmark sets up an array of threads, and then calls a 
synchronized method to update a counter inside them (source is 
uncommented but I couldn't see any problems with it).

Cheers,
Chris

=============================================================

$ wget 
http://www.epcc.ed.ac.uk/computing/research_activities/java_grande/threads/jgf_threadv1.0.tar.gz
$ tar xvfz jgf_threadv1.0.tar.gz
$ cd threadv1.0  # not 100% sure about dir name, I changed mine
$ cd jgfutil
$ javac *.*      # or gcj-3.3.2
$ cd ..
$ cd section1
$ javac *.*      # or gcj-3.3.2
$ java -cp .:..:/usr/localcc/pkgs/j2sdk1.4.1/jre/lib/rt.jar JGFSyncBench

The no of threads has not been specified, defaulting to 1

Java Grande Forum Thread Benchmark Suite - Version 1.0 - Section 1
Executing on 1 thread

Section1:Sync:Method                            81471.58 
(synchronisations/s)
Section1:Sync:Object                            79458.69 
(synchronisations/s)

$ sablevm-staging-switch -c .:.. -Y JGFSyncBench

The no of threads has not been specified, defaulting to 1

Java Grande Forum Thread Benchmark Suite - Version 1.0 - Section 1
Executing on 1 thread

java.lang.NullPointerException
    at SyncMethodRunner.run (JGFSyncBench.java:166)
    at JGFSyncBench.JGFrun (JGFSyncBench.java:64)
    at JGFSyncBench.main (JGFSyncBench.java:133)
    at java.lang.VirtualMachine.invokeMain (VirtualMachine.java)
    at java.lang.VirtualMachine.main (VirtualMachine.java:88)

$ sablevm-staging-switch -c .:.. -Y JGFSyncBench

The no of threads has not been specified, defaulting to 1

Java Grande Forum Thread Benchmark Suite - Version 1.0 - Section 1
Executing on 1 thread

Exception in thread "Thread-10" java.lang.NullPointerException
    at SyncMethodRunner.run (JGFSyncBench.java:166)
    at java.lang.Thread.run (Thread.java:455)
    at java.lang.VMThread.callRun (VMThread.java:116)
    at java.lang.Thread.callRun (Thread.java:333)
    at java.lang.VirtualMachine.runThread (VirtualMachine.java:117)
java.lang.NullPointerException
    at SyncMethodRunner.run (JGFSyncBench.java:166)
    at JGFSyncBench.JGFrun (JGFSyncBench.java:64)
    at JGFSyncBench.main (JGFSyncBench.java:133)
    at java.lang.VirtualMachine.invokeMain (VirtualMachine.java)
    at java.lang.VirtualMachine.main (VirtualMachine.java:88)

---> it's different output each time as well, which makes this messier.