I'm curious what decompression speeds you see for lzham? The compression ratios are impressive, but I assume that's at the cost of taking longer to unpack.
On Tue, Sep 15, 2015 at 7:17 PM, Charles Vaughn <[email protected]> wrote: > If you're interested in checking out LZHAM, I've got that building for > emscripten here: https://github.com/hackcasual/lzham_codec > > For bananabread, I saw the following results for of the models: > > rw-rw-r-- 1 charles charles 385692 Sep 15 19:12 m134_hudguns.blend > -rw-rw-r-- 1 charles charles 138954 Sep 15 19:13 m134_hudguns.blend.lz4 > -rw-rw-r-- 1 charles charles 83108 Sep 15 19:14 m134_hudguns.blend.lzham > > On Tuesday, September 8, 2015 at 5:11:26 PM UTC-7, Alon Zakai wrote: >> >> incoming now has optional LZ4 compression for file packages. What this >> lets you do is pre-compress your filesystem data, and keep it compressed in >> memory, and only decompress chunks on demand as they are read. This means >> that you can reduce the total amount of memory used by your application. >> >> LZ4 ( https://en.wikipedia.org/wiki/LZ4_%28compression_algorithm%29 ) is >> a very fast compression algorithm. In my benchmarks it makes little >> difference to I/O speed, and in general I/O from our in-memory filesystem >> is fast anyhow since it's already in memory. So the downside of needing to >> decompress seems small, I don't see much difference in BananaBread startup, >> for example, with or without LZ4 compression. >> >> Of course how useful this is depends on how compressible your data is. >> LZ4 can compress text very well, but often data in things like games is >> already compressed, like compressed textures and audio. Still, I saw >> 10%-25% compression on a few games I tried. >> >> Feedback and testing are very welcome. Some docs are at >> >> >> https://github.com/kripken/emscripten/blob/71bf8ed55ed03a96a018f76bf2003acf32db3235/src/settings.js#L250 >> >> but basically just run emcc with -s LZ4=1 . (If you run the file >> packager separately, you need to also pass --lz4 to it.) >> >> - Alon >> >> -- > You received this message because you are subscribed to the Google Groups > "emscripten-discuss" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "emscripten-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
