On Oct 7, 2012, at 10:00 AM, Wojciech Puchar wrote: >> I would be willing to work on a SMP version of tar (initially just gzip or >> something). >> >> I don't have the best experience in compression, and how to multi-thread it, >> but I think I would be able to learn and help out. > > gzip cannot - it is single stream.
gunzip commutes with cat, so gzip compression can be multi-threaded by compressing separate blocks and concatenating the result. For proof, look at Mark Adler's pigz program, which does exactly this. GZip decompression is admittedly trickier. > bzip2 - no idea bzip2 is block oriented and can be multi-threaded for both compression and decompression. Tim _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
