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From "Alexei Fedotov" <alexei.fedo...@gmail.com>
Subject Re: [classlib] [archive] Re: jar and zip optimizations
Date Tue, 08 Apr 2008 07:23:47 GMT
Dmitry,
What happens if you delete (add <delete file="<path to zlib1.dll>" />
to working_vm/build.xml at setup target)
this library right before the compilation starts?

Thanks.


On Mon, Apr 7, 2008 at 8:25 PM, Dmitry Egorov <d.egorov@inbox.ru> wrote:
> Hello, Mark.
>
>
>
> > I'm curious to know whether you plan to make zlib optimisations that are
> > harmony specific.  If not, then it would be much better to contribute
> > them back to the zlib project directly and not maintain them in the
> > harmony project.
> >
>
>  No, this optimizations are not Harmony specific, but  uses external
> optimization library, which is not free. I already have optimized zlib, so I
> just need to build it into Harmony.
>
>  My current goal is to make a small step - integrate my zlib into vm build
> system on my computer and see if I get considerable Harmony's performance
> increase. Based on results I can therefore think of integrating it in a
> "good way", which means searching for the optimization library's presence on
> the system and loading alternative zlib in case it is found.
>
>  For that goal I just need to be sure that vm is using zlib1.dll, downloaded
> from the internet. Dependency walker says it is, but what confuses me is
> zdll.lib. Is it just redundunt or used somewhere?
>
>
>
>  Mark Hindess wrote:
>
> > HY_LOCAL_ZLIB is set by the ant option -Dhy.local.zlib=true.  It is
> > intended for use on unix machines where libz.so is typically already
> > available (and in memory).  This option is not enabled by default but
> > since the zlib api is pretty stable this would seem to be a reasonable
> > default for unix machines.  I do set this option when building the
> > debian packages (which is why I noticed/reported that the harmony
> > version was not using the most effective compiler optimisations on linux
> > x86/x86_64).
> >
> > I'm curious to know whether you plan to make zlib optimisations that are
> > harmony specific.  If not, then it would be much better to contribute
> > them back to the zlib project directly and not maintain them in the
> > harmony project.
> >
> > -Mark.
> >
> >
> > On 5 April 2008 at 16:41, Dmitry Egorov <d.egorov@inbox.ru> wrote:
> >
> >
> > > Hello, everyone!
> > > I'm now working on zlib optimization using external performance library.
> For now my goal is to make Harmony use my modified zlib code instead of the
> one downloaded from the internet.
> > > So I've been struggling with build system for quite a long time. As far
> as I can understand now, both vm and classlib use hyzlib.dll (i'm currently
> working in Windows), which is made by downloading and compiling zlib's
> sources in classlib's buildfiles.
> > >
> > > But I'm not sure, because there's code in vm's build files which
> downloads zlib1.dll and zdll.lib. But I can't figure out whether vm is using
> it or not. On the other side, I found that vm has code related to
> > > hyzlib.dll in working_vm\vm\vmcore\src\init\vm_properties.cpp:
> > > static const char *api_dll_files[] =
> > > {
> > >    "harmonyvm",
> > >    "hythr",
> > > #if !defined(HY_NO_SIG)
> > >    "hysig",
> > > #endif
> > >    "hyprt",
> > > #if defined(HY_LOCAL_ZLIB)
> > >    "z",
> > > #else
> > >    "hyzlib",
> > > #endif
> > >    "hynio",
> > >    "vmi",
> > >    "hyluni",
> > >    "hyarchive"
> > > }; ...
> > >
> > > My primary goal is to optimize vm's zlib performance to boost start up
> time. So my question is whether vm is using hyzlib.dll or not?
> > >
> > > Tim Ellison wrote:
> > >
> > >
> > > > Dmitry Egorov wrote:
> > > >
> > > >
> > > > > Hello Mark, Tim,
> > > > > Thank you for your idea!  We have discussed possible native
> > > > > optimizations of jar and zip code with Alexei Fedotov and I'm
> > > > > currently looking into this.
> > > > >
> > > > >
> > > > Great.  Looking through the JIRAs I see Alexei raised a 'double read'
> issue.  You still have outstanding questions about this Alexei?
> > > >
> > > > [1] http://issues.apache.org/jira/browse/HARMONY-5526
> > > >
> > > > Regards,
> > > > Tim
> > > >
> > > >
> > > >
> > > >
> > >
> >
> >
> >
> >
> >
>
>



-- 
With best regards,
Alexei

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