gc log analysis tools

[Ben Cheng]

The reason I am interested in this information is because I have a benchmark
whose score is X using 32-bit VM and 2G of heap. When I switched to 64-bit
build of the same VM, the score dropped to 0.77X with the same amount of
heap. If I increase the heap size to 3.5G (on a machine with 4GB of RAM),
the score went to to 1.40X.

What I need is pretty basic - it sums up all the gc time from the verbose
log during a benchmark run, as I want to verify if the change in gc time
correlates to the change in performance. I can write a similar script to do
that, but I just want to check to see if there is a working tool out there
already. Apparently the verbose gc log format changed from 1.5 and beyond
and the old script is not compatible.

Thanks,
-Ben

On 10/25/07, Neo Jia <neojia at gmail.com> wrote:
>
> Ben,
>
> What is your opion? I had one but not sure if it would work for you or not
> (
>
> I have not worked on JDK for a while ...
>
> Thanks,
> Neo
>
> On 10/25/07, Ben Cheng <bccheng at google.com> wrote:
> > Hi,
> >
> > I was trying to get a sense of total GC time spent in a Java app using
> 1.6
> > JDK. The gc logs (w/ and wo/ parallel gc) seem to break the ancient tool
> > gc_analyze.pl found on the web.
> >
> > Is there an update to date tool to produce the desired information for
> new
> > JDKs?
> >
> > Thanks in advance,
> > -Ben
> >
>
>
> --
> I would remember that if researchers were not ambitious
> probably today we haven't the technology we are using!
>
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