On 10/14/14 5:12 PM, Neil wrote:
Gregory Szorc wrote:
If you are looking for ideas on how to reduce download size, the way
omni.ja is included in the installer could be reduced by 4+ MB. Both
omni.ja and browser/omni.ja are zip archives, where each file has a
separate compression context. If you treat all files from those two
archives as a single compression context (like tar+bz2) and stuff them
in a single archive, you get size reductions of 4+ MB due to the
compression engine sharing state between files. We can't install
omni.ja like this on client systems because it is bad for performance
(we want the ability to extract individual files without reading a
large compression context - this is a benefit of the zip format). But
we could ship the files optimized for size (or have installer's
compression handle the files individually) and have the installer
re-encode them to omni.ja so they are optimized for performance.
I'm not sure what you're trying to say here. As far as I can see what
you're suggesting is using some RAR-like rather than ZIP-like format for
the installer. Why would the way you're compressing the two omni.ja
files into the installer affect the installed omni.ja files?
The more data you throw into the compression engine, the greater the
chances there will be redundant data and you won't have duplicate
representations of that data inside the compressed result. There's a lot
of data inside both omni.ja and it turns out that many forms of
compression will find those duplicate patterns and prevent the redundancy.
Also, we're not talking about changing omni.ja as it exists in the
installed application: only how data within omni.ja is "packaged" and
shipped in the installer. Discussions on whether omni.ja should be e.g.
lzma or laid out differently on disk are orthogonal but still important
to have (because they impact performance, especially start times).
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