my stuff on github

[Shelwien]

https://github.com/Shelwien

Added ppmd_sh for now.
Please tell me what else from http://nishi.dreamhosters.com/u , http://nishi.dreamhosters.com/ , http://ctxmodel.net , etc
would you like to see there?

[joerg]

can you please upload a windows binary for testing here?

interesting to see for me on github
you interesting "plzma = parallel lzma" - and - your "parcoder" (but the program seems not to work under my windows 10)

best regards

[Shelwien]

> can you please upload a windows binary for testing here?

https://github.com/Shelwien/ppmd_sh/releases
http://nishi.dreamhosters.com/u/ppmd_sh9.rar

These are actually different, so you can compare them :)

> you interesting "plzma = parallel lzma"

"plzma" is not from parallel lzma, unfortunately, its just lzma with added lzmarec entropy coder -
basically slower lzma with 1-2% better compression.
But I guess you can test plzma4 in http://nishi.dreamhosters.com/u/7zdll_v5.rar - that one is MT (lzmarec mode with :a=1)

> and - your "parcoder" (but the program seems not to work under my windows 10)

Do you mean http://compression.ru/sh/parcoder.rar ?
No wonder it doesn't work, its from 2001.
Here, I updated it and uploaded: http://nishi.dreamhosters.com/u/ParCoder.rar
But again, its not MT, or fast. Its just a demo of rangecoder interleaving, using multiple files.

There's also a more modern implementation of that - http://nishi.dreamhosters.com/u/vecrc_v0.rar
Also I have psrc, which actually uses two threads, at last. But the source I have for psrc is kinda too complicated for a demo...

[Dimitri]

hello, can you make this http://nishi.dreamhosters.com/u/7zdll_v5.rar into one static exe ?

thanks in advance

[Shelwien]

Here's v6: http://nishi.dreamhosters.com/u/7zv6.exe
If you have specific requests (like x86 or plzma2), please tell in advance.

[Dimitri]

i added some non default settings also increased block by some margin, 7z a -mx=9 -bb3 -mm=plzma2:mt=6:c=10000m:a=1:d128m:fb=273:mc=100000 000:lc=4:lp=0 data.7z data.dat

i use plzma2 x64 but i think it has some problem regarding its stdin and stdout ....

[Shelwien]

10G block? that's just weird, why use plzma2 then? there's non-MT plain plzma.
Which is also in http://nishi.dreamhosters.com/u/plzma_v3c.rar btw

[Dimitri]

plzma2 is plain fast plus i like testing this, here is what i did long time ago custom compile 7z with zstd and lzham support.


at the moment i use this:


[External compressor:lzma2]
header = 0
packcmd = 7z a -txz -an -m1=lzma2:d512m:fb=273:mf=bt4:mc=100000000:lc=4:lp= 0 -mmt=2 -mx9 -si -so <stdin> <stdout>
unpackcmd = 7z x -txz -an -y -si -so <stdin> <stdout>

xz has true stdout, but it lacks MT decompression which is a problem.