837110 - Use snappy or lz4 instead of zlib for compressing js source

Status: NEW

(Core :: JavaScript Engine, defect)

Description

[Jeff Muizelaar [:jrmuizel]]

JS source compression shows up noticeably when starting the email app (see bug 836515)

In the quick measurements that I did, fast lz compressors tend to be about 10x faster and produce output that's about 1.5x bigger when run on minified js source. This is probably a trade off worth taking at least for single core cpus.

Comment 1

[Jeff Muizelaar [:jrmuizel]]

Here are some actual numbers from on ARM on gaia-email-opt.js

time ./snzip -c /home/jrmuizel/gaia-email-opt.js  > /dev/null
real	0m0.123s

time gzip -c /home/jrmuizel/gaia-email-opt.js  > /dev/null
real	0m0.737s

size:
snappy: 522077
gzip:   328346

Comment 2

[Chris Peterson [:cpeterson]]

If you choose to compress JS sources with Snappy, you may also want to fix bug 768074 (update our in-tree copy of Snappy to get their ARM optimizations).

Comment 3

[fxtech]

now LZ4 it support also strems

http://fastcompression.blogspot.it/p/lz4.html