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What's the next step after LZ77?

7 posts in this topic

The first compression algorithm I learned to use was RLE. Then I learned LZ77 and am currently using it in my program. However, it's rather slow and not that efficient. Check out a sample compression comparison of an actual file that my program would need to compress:

 

Original filesize: 15.2MB

 

My LZ77 algorithm:

Filesize: 4.5MB (29.49% compression)

Time: 9.24 seconds

 

WinRAR:
Filesize: 905KB (5.79% compression)

Time: an instant

 

I could definitely use an improvement like that. What are my options?

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Like just said before: Take a look at LZ4 - it's used by Frostbite on PS4 and XBox One:

 

https://code.google.com/p/lz4/

https://twitter.com/JonOlick/status/466082222420664321

 

"LZ4 is a very fast lossless compression algorithm, providing compression speed at 400 MB/s per core, scalable with multi-cores CPU. It also features an extremely fast decoder, with speed in multiple GB/s per core, typically reaching RAM speed limits on multi-core systems."

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Original filesize: 15.2MB
Filesize: 4.5MB (29.49% compression)
Filesize: 905KB (5.79% compression)


Your math completely fails to add up.

Also, you should profile and optimize your LZ77 implementation. 9 seconds to compress 15 MB is pretty horrific... assuming you're not running on a 386 :-P
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Welp, excuse my bad timings. Right after I posted this thread I went back to my algorithm (which I wrote 5 months ago) and re-wrote it, I figured out a way to make it faster. It now compresses at 26.55% in only 1.37 seconds. Much better, but I still want more.

 

 

LZMA is an improved LZ77 algorithm, you could try using it. I think on average it compresses better than WinRAR.

It's in public domain so you don't need any licenses (I'm not an expert) and could use SDK:

http://www.7-zip.org/sdk.html

I'll definitely take a look at that! Thanks!

 

 

What do your files typically contain?

Commands to re-create a simulated environment. I plan on optimizing the data itself for size eventually, but the program can potentially run forever (generating infinite amounts of records) so compression still has to be as good as possible.

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