Pxz has its own disadvantages though. Since (from what I have read) LZMA can't be multithreaded easily, pxz compresses different parts of the file at the same time (dumping them in /tmp), and finally putting them all together at the end. For solid archives this reduces the compression ratio in exchange for a (quite significant) speedup. In most cases the ratio watsed is quite small, so the tradeoff is worth it.
Posted Mar 1, 2013 9:16 UTC (Fri) by nmav (subscriber, #34036)
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Indeed. However I'd suggest looking at plzip instead of the xz tools. I was surprized by the difference in compression ratio between them, even if they are based on the same compression algorithm.