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p7zip 9.20.1b "testing" (Users)

posted by Zyzzle, 25.08.2012, 00:59

>
> > Also, your 9.20 is ~200k more bloated than that old 9.13,
>
> Probably a libc issue, who knows. I could rebuild entirely with "-Os", but
> it wouldn't be faster, probably slower.
If you've got the time, it would be interesting to test how the size and speed with -Os compares.

I'm testing it on 2 systems, one is an old Intel Atom netbook, the other an i7 2600k, so it appears that -machinetype=i686 would yield best results on both systems. Also, you could try -O3 and I can compare if there are any speed differences.

>
> > which I still use,
> > and which was also compiled with [FSU] pthreads. There seems no speed
> advantage
> > at all to 9.13 vs 9.20, are there any hidden advantages?
>
> Honestly, I don't know, perhaps bugfixes. I didn't check the changelog,
> just assumed it was better! :-)
>
> http://www.7-zip.org/history.txt
>

Lots of "bug fixes" listed since 9.13, but it is not specified what these fixes are or do!

> > EDITED to ask if it's possible to get a compile of 7zip .ZIP deflate
> modes
> > ONLY, without any other compression modules?
>
> No, not really, not that I know of. You can try AdvanceComp's ADVZIP.EXE
> ("-z4") to repack .ZIPs in place. It may? also allow creating archives from
> scratch, but I don't know if that's .7z only or what (can't remember).
>
> http://advancemame.sourceforge.net/comp-readme.html
>
> http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/util/file/7zip/advancecomp/
>
> N.B. Those binaries of his are several years old, so if you want fresher
> (probably more bloated but faster), I can oblige. Just please mention
> compiler settings preferrred. ;-)
Yes, I've used ADVZIP for years, however even its "insane" setting isn't as good as 7zip's -mx9 deflate settings for creating optimized .ZIPS. This may be due to the old age of the code (2005) I'm using, but see below!

I found AdvanceComp 1.16 beta here: http://advancemame.sourceforge.net/beta/
which is the latest version for DOS I can find. It doesn't improve on speed or compression. If you've got newer code that you can compile (with machinetype=i686 and -O2 or -O3 GCC compiler options, I'd love to try them out! Thanks for offering.

>
> > Anyway, thanks for making 9.20 available for us to test.
>
> I assume this means you used the second one ('\' fixes, aka
> "9.20.1b-testing")?
Yes, that second one works perfectly for me with -mx8 and -mx9 and .EXE filters, your first compile did not work with -mx9 and .EXE filters. Good sleuthing on figuring out that compiler error!

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