tamp is a multi-threaded file compressor built on top of quicklz library, the fastest open-source file compressor i m aware of, produces files slightly larger than lzop, compresses data many times faster than lzop i set KEYWORDS to *, though i only tested tamp on amd_64 architecture
Created attachment 201149 [details] tamp-2.5.ebuild
dev-libs/quicklz ebuild (dependency of tamp ebuild) is over there: http://bugs.gentoo.org/show_bug.cgi?id=281347
strange that tamp writes 8M when compressing without checking for partial writes. IMHO tamp might fail to write compressed stream when block size is big (though i have not seen it fail yet) i emailed upstream about this