Quick shrink

Mr. ZIP promoted the use of ZIP codes for the ...

Mr. ZIP promoted the use of ZIP codes for the USPS during the 1960s and 1970s. (Photo credit: Wikipedia)

Just a quick post about something I just found out: using 7-zip (open source, hence preferred) can be slow. WinRAR has the name to be faster, and co-workers sometimes ask why it is not used instead.

But 7-zip uses multiple compression algorithms. Most of the time, the default algorithm (LZMA) is used. But the option to use the improved LZMA2 has been around for a while. This algorithm has been designed so that it can use multiple cores, whereas LZMA can only use 2 CPU cores effectively. And I have to say: speed increase on “Normal” compression is already 50%. I have not yet checked out the resulting size, but I need a deflation to about 10% of the original file, and that really seems feasible right now (halfway the process).

Maybe you’ve wondered about this, and maybe you already knew this. But if you didn’t yet, I hope I just made your waiting times a bit shorter 🙂

Update: to use the LZMA2-algorithm from the commandline, use the following:

7z a -m0=lzma2 -mmt6 o:\1.7z o:\1.dmp

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