Your message dated Sat, 1 May 2010 15:58:20 +0200
with message-id <[email protected]>
and subject line Re: Bug#439347: Bug #439347 sun-java6-jdk: Unexpected
performance (in a numerical application)
has caused the Debian Bug report #439347,
regarding sun-java6-jdk: Unexpected performance (in a numerical application)
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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439347: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=439347
Debian Bug Tracking System
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--- Begin Message ---
Package: sun-java6-jdk
Version: 6-02-1
Severity: normal
Hello.
When running a medium-size simulation program, I get contradictory
performances if "java" is launched with the "-Xint" option or not.
Let me elaborate:
At some point of the simulation, the same quantity Q can be computed in 2
different ways, say "QH" and "QL". When using "QL", the program is about
twice as fast as when using "QL". This is confirmed when using "-Xint".
Leaving out "-Xint" (for maximum performance), the result is, quite
surprisingly, the other way around: Using "QL" is about 50% slower than
with "QH"!
Doesn't this indicate some subtle bug in the JIT compiler?
Note that I recompiled everything with java 1.5, and there, the results
between interpreted bytecode and JIT-compiled code are consistent.
Best regards,
Gilles
-- System Information:
Debian Release: lenny/sid
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable')
Architecture: i386 (i686)
Kernel: Linux 2.6.19.1g1 (PREEMPT)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/bash
Versions of packages sun-java6-jdk depends on:
ii debconf [debconf-2.0] 1.5.14 Debian configuration management sy
ii libc6 2.6-5 GNU C Library: Shared libraries
ii libx11-6 2:1.0.3-7 X11 client-side library
ii sun-java6-jre 6-02-1 Sun Java(TM) Runtime Environment (
sun-java6-jdk recommends no packages.
-- debconf information excluded
--- End Message ---
--- Begin Message ---
On Sat, May 1, 2010 at 12:47 PM, Torsten Werner <[email protected]> wrote:
> the bug is old but if you are still interested in getting it fixed:
> please attach some test code that allows us to verify the problem.
The submitter suggested to close the report.
Torsten
--- End Message ---
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