$ time find pctraining | cpio -o | bzip2 > pctraining.cpio.bz2    
find pctraining  0.00s user 0.01s system 59% cpu 0.025 total
cpio -o  0.11s user 0.20s system 5% cpu 5.455 total
bzip2 > pctraining.cpio.bz2  5.06s user 0.08s system 91% cpu 5.604 total

$ time find pctraining | cpio -o | pbzip2 > pctraining.cpio.pbz2
find pctraining  0.00s user 0.01s system 52% cpu 0.026 total
cpio -o  0.10s user 0.19s system 15% cpu 1.940 total
pbzip2 > pctraining.cpio.pbz2  3.64s user 0.20s system 160% cpu 2.397 total