Re: untar with plzip faster than with lzip for no apparent reason

[Sonia Diaz Pacheco]

Hello wrotycz,

El dom, 29 sept 2024 a las 15:51, wrotycz (<wrotycz@wir.pl>) escribió:

I found this, interesting thing - when untarring single member lzip compressed tar plzip turnes out to be apparently faster than lzip,

despite the fact that that archive is single member and pure decompression is faster with lzip.

I think it could be because lzip buffers the decompressed output in blocks of 32 MiB (dictionary size in the files you are testing) while plzip buffers the decompressed output in blocks of 1 MiB.

If you have a chance, try experimenting with the --out-slots option in plzip[1] to find out if there is any difference.

[1] http://www.nongnu.org/lzip/manual/plzip_manual.html#Invoking-plzip

Cheers,

Sonia