ccm - the elephant in the room

[avitar]

Guys

Do you yet have anything to compare to ccm? It's quite old now, n years since development started. I've tried arc, bcm, crush,7zip etc. CCM appears to outperform all of them on my smallish file (8M) of xml ie text. For a compression time of a few seconds it is better (75% of the archive size) than arc -mx, and much (or much much) better than the others.

I haven't tried it for the really big files that you guys try and guess, because it isn't open source that it isn't checked in the tests that you do. I believe that the techniques used are known. So - does anyone have anything that it 'up to date' that's as good?

John

[Nania Francesco]

simply .. ZCM !

[Sportman]

Did you tried ZCM it was best in my XML/HTML tests since some months:
http://heartofcomp.altervista.org/ZCM/home.htm

It only support 8 core, if it had 12 or 16 core support it was more useful.

[Skymmer]

Avitar, you can try ZPAQ, BSC, NanoZip. All of them support multi-threading, have both x86\x64 versions and have good set of options to play with. Here is the little test on Program Files folder from my Win7 x64 SP1 installation.
Size is 441 753 333 bytes.

                                       time        mem          size
                                     -------     -------     -----------
ccmx 1.30 -7                         124.750     1304 MB     194 807 968
nz 0.09 x64 -nm -cc -t8 -p8 -m1g      89.625     1064 MB     187 310 003

As you see, NZ beats CCM by all terms. It runs faster with less memory used, but also gives a smaller size. But with these options NZ uses all 8 logical CPUs of my system and tested compilation is x64 one.

[m^2]

As you see, NZ beats CCM by all terms. (...) But with these options NZ uses all 8 logical CPUs of my system and tested compilation is x64 one.

These 2 are clearly contradictory...

[avitar]

thanks. Downloaded zcm v0.88 & it works ok.

BTW, feature? -zcm a ans.dat ans.zcm crashes, but ok w/o the .zcm extension.

J

[Matt Mahoney]

Archive name comes first.