BSDTAR AND COMPRESSION STATS

[andrew@lloyd ~]$ time (bsdtar cf docs.tar docs && gzip docs.tar)
(; bsdtar cf docs.tar docs && gzip docs.tar; )  7.57s user 0.42s system 94% cpu 8.464 total
[andrew@lloyd ~]$ time (bsdtar cf docs.tar docs && bzip2 docs.tar)    
(; bsdtar cf docs.tar docs && bzip2 docs.tar; )  38.67s user 0.43s system 99% cpu 39.150 total
[andrew@lloyd ~]$ time (bsdtar cf docs.tar docs && ba7 docs.tar.7z docs.tar)
(; bsdtar cf docs.tar docs && ba7 docs.tar.7z docs.tar; )  78.51s user 1.08s system 177% cpu 44.846 total
[andrew@lloyd ~]$ time (bsdtar cf docs.tar docs && xz docs.tar)             
(; bsdtar cf docs.tar docs && xz docs.tar; )  73.54s user 0.62s system 99% cpu 1:14.20 total
[andrew@lloyd ~]$ du -s docs*
129380  docs
99044   docs.tar.7z
104720  docs.tar.bz2
105264  docs.tar.gz
99404   docs.tar.xz
[andrew@lloyd ~]$ du -sh docs*
127M    docs
97M     docs.tar.7z
103M    docs.tar.bz2
103M    docs.tar.gz
98M     docs.tar.xz
[andrew@lloyd ~]$ cat bin/ba7 
#!/bin/sh

7z a -t7z -m0=lzma -mx=9 -mfb=64 -md=32m -ms=on $1 $2