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From Dmitry Egorov <d.ego...@inbox.ru>
Subject Re: [archive] Re: jar and zip optimizations
Date Sat, 05 Apr 2008 12:41:47 GMT
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[] =
#if !defined(HY_NO_SIG)
#if defined(HY_LOCAL_ZLIB)
}; ...

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

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