In 1979 American computer scientist Jack Dongarra (University of Tennesse, Knoxville and Oak Ridge National Laboratory, Oak Ridge, TN) together Jim Bunch, Cleve Moler and Pete Stewart developed the LINPACK Benchmark, a measure of a system's floating point computing power. The LINPACK benchmark measures how fast a computer solves a dense n by n system of linear equations Ax = b, which is a common task in engineering. It is the benchmark used in the twice-annual ranking of the world's supercomputers by Top500.org.