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From zouqiong <ust...@gmail.com>
Subject Re: performance of drlvm
Date Fri, 28 Jul 2006 00:53:31 GMT
Hi, Stefano
       I think your idea about to keep a profile for the next run of the
same software is a
good idea. We, people, here always talk about this idea. But in fact, few vm
this idea, i am curious about it.

2006/7/28, Stefano Mazzocchi <stefano@apache.org>:
> zouqiong wrote:
> > I am very happy to know a person who has a common goal with me :-)
> >
> > en, my research focus on how to get more useful information to guide
> > compile
> > thread
> > and garbage collector to optimize the data locality and code quality,
> > and my
> > interest
> > is how to use performance monitor to get profile , and i think few
> vitural
> > machine use the performance monitor to guide code optimization
> > automatic. Of
> > course, many paper
> > use PMU to guide the analysis.
> There is one interesting trick that I learned at an IBM presentation
> that was done at MIT last year (apologies, I don't remember the name of
> the speaker) about the trick of "persisting" the runtime optimization
> information that the JVM discovers after the first few runs of a
> particular program.
> For server side software, the warm-up time is not a big deal, but for
> client side software, it's a huge deal if Eclipse (or your, ehm, firefox
> extension written in java <grin>) starts up in 0.5 seconds instead of 5.
> The idea, basically, is that the *very first* time an application is
> run, the JVM will profile it and optimize the bytecode -> native
> compilation and go on doing its normal hot-spot stuff... but then every
> now and then, or at shutdown, the JVM will write that info on disk, so
> that it will be possible for the *next* run to start with a
> "optimization profile" that is, so-to-speak, precompiled and doesn't
> have to be inferred from the runtime execution of the program.
> There are some issues with the approach, but I think it's a great idea
> and nothing that we, as a community, can't find an answer for.
> BTW, would be great to have those people here talking to us about those
> new JVM tricks they are doing in IBM for J9.
> --
> Stefano.
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Best Regards,

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