Description of problem:
dracut runs compression utilities in various places. And while xz/lzma has the -T option to tell number of threads they should use and there is 'pigz' as a parallel version of gzip, dracut doesn't make use of that. Changing those calls would significantly speed up processing on multicore machines.

Version-Release number of selected component (if applicable):
dracut-034-24.git20131030.fc21.x86_64

How reproducible:
100 %

Steps to Reproduce:
1. run dracut
2. run 'top' to see that the forked 'xz' process uses at most 100 % CPU

Actual results:
compression done using one thread only

Expected results:
compression done using as much threads as possible