The Contest program is designed to test system responsiveness by running Linux kernel compilation under a number of different load conditions. It is designed to compare different kernels, not different machines. It uses real workloads you would expect to find for short periods of time in everyday machines, but sustains them for the duration of a kernel compile to increase the signal to noise ratio.
kernbench is a CPU throughput benchmark. It is designed to compare kernels on the same machine, or to compare hardware. It runs a kernel compile at various numbers of concurrent jobs: 1/2 number of CPUs, optimal (default is 4xnumber of CPUs), and maximal job count. Optionally it can also run single threaded. It then prints out a number of useful statistics for the average of each group of runs.
LRZIP is a compression program and library that can achieve very high compression ratios and speed when used with large files using unlimited sized compression windows. It uses the combined compression algorithms of zpaq and lzma for maximum compression, lzo for maximum speed, and the long range redundancy reduction of rzip. It is designed to scale with increases with RAM size, improving compression further. A choice of either size or speed optimizations allows for either better compression than even lzma can provide, or better speed than gzip, but with bzip2 sized compression levels. It also has high grade password protected encryption and full STDIN/STDOUT support.
In fact tar itself is broken and that command line option does not work, nothing to do with lrzip! So unfortunately you have to use the lrztar wrapper that it comes with or do it in two steps (which yields better compression than the wrapper).