Verification failure in SPECJVM2008.scimark.fft.small on Windows/32bit

[Volker Simonis]

Hi,

we have problems with SPECJVM2008 on Windows/x86 machines with at
least 4 cores and at least 4 benchmark threads. The benchmark
reproducible fails in the result verification of the sub-benchmark
scimark.fft.small (however in random places).

We could reproduce the problem with JDK 6u7 and 6u10 as well as with
the latest JDK 7b38 however only for the 32-bit Windows versions.

Because the problem occurs with both, C1 and C2 and because the
problem isn't reproducible neither with  -Xint, nor with the 64-bit
Windows or the Linux JDK, we think that this may be a problem in the
HotSpot runtime (perhaps a timing/concurrency problem with the
handling of 64-bit doubles in a 32-bit JDK on multi core machines?),
but this is only a wild guess.

We also observed that all the files (JDK, test classes and result
files) had to be on the local host in order to reproduce the problem
and we had the impression that the benchmark fails more quickly on
Intel XEON, compared to AMD Opteron (we tested on the following
hardware: Intel (2x XEON (with HT), 3.4GHz, 8GB, MS Win Server 2003
Enterprise x64, SP1) and AMD (4x Opteron 270, 2.0GHz, 9GB, MS Win
Server 2003 Enterprise x64, SP1)).

Has anybody else already observed this problem? Is this perhaps an
issue of SPECJVM2008.scimark.fft.small?

Any comments would be highly appreciated!

Regards,
Volker

PS: JVM2008 is available from http://www.spec.org/download.html

PPS: here's the command line we used for the tests: java -server
-XX:+CITime -Djava.io.tmpdir=tmp -jar SPECjvm2008.jar -ikv -wt 30 -it
60 -bt 4 --base scimark.fft.small scimark.fft.small scimark.fft.small
scimark.fft.small scimark.fft.small scimark.fft.small
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scimark.fft.small scimark.fft.small scimark.fft.small
scimark.fft.small scimark.fft.small scimark.fft.small
scimark.fft.small scimark.fft.small