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From "Xiao-Feng Li" <xiaofeng...@gmail.com>
Subject Re: [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory (HARMONY-5281)
Date Thu, 13 Mar 2008 11:06:38 GMT
On Thu, Mar 13, 2008 at 7:01 PM, Alexei Fedotov
<alexei.fedotov@gmail.com> wrote:
> Thanks, Pavel!
>  I believe that your idea of making a questionable option configurable
>  is the best way to resolve these concerns.

Yes,  agreed.

Thanks,
xiaofeng
>
>
>  On Tue, Mar 11, 2008 at 4:13 PM, Pavel Pervov <pmcfirst@gmail.com> wrote:
>  > Xiao-Feng,
>  >
>  >  Yes, in the patch I've also added command line option to change that
>  >  behaviour (actually, patch _adds_ jar mapping, not _changes_ file
>  >  reads to mapping).
>  >  I made it on by default in the patch but I can change it to off before
>  >  committing and keep this functionality as a potential performance
>  >  optimization on some scenarios.
>  >
>  >  Pavel.
>  >
>  >
>  >
>  >  On 3/7/08, Xiao-Feng Li <xiaofeng.li@gmail.com> wrote:
>  >  > On Fri, Mar 7, 2008 at 6:42 PM, Nataly Naumova
>  >  > <natalya.s.naumova@gmail.com> wrote:
>  >  > > Tim,
>  >  > >
>  >  > >  I've measured the startup performance for simple applications, speedup
>  >  > >  was ~2-3% on simple graphics aplication with lots of AWT/SWING
>  >  > >  classes. But I think the idea is quite pretty, because of we get rid
>  >  > >  of a big amount of system calls, such as lseek, read etc. As we're
>  >  > >  working just with pointers directly.
>  >  >
>  >  > Can it be a runtime option chosen by the user?
>  >  >
>  >  > Thanks,
>  >  > xiaofeng
>  >  > >
>  >  > >
>  >  > >  On Thu, Mar 6, 2008 at 7:45 PM, Tim Ellison <t.p.ellison@gmail.com>
wrote:
>  >  > >  > Pavel Pervov (JIRA) wrote:
>  >  > >  >  > Please, note, that memory footprint of DRLVM will increase
by size of
>  >  > >  >  > JRE, namely, ~20 megs.
>  >  > >  >
>  >  > >  >  Eek, that's quite significant!  What's the speed-up by doing
this?
>  >  > >  >
>  >  > >  >  Regards,
>  >  > >  >  Tim
>  >  > >  >
>  >  > >
>  >  > >
>  >  > >
>  >  > >  --
>  >  > >  Nataly Naumova,
>  >  > >  Intel Middleware Products Division
>  >  > >
>  >  >
>  >  >
>  >  >
>  >  > --
>  >  > http://xiao-feng.blogspot.com
>  >  >
>  >
>  >
>  >
>  >
>  > --
>  >  Pavel Pervov,
>  >  Intel Enterprise Solutions Software Division
>  >
>
>
>
>  --
>  With best regards,
>  Alexei
>



-- 
http://xiao-feng.blogspot.com

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