A supercomputer is a computer with a high level of computing performance compared to a general-purpose computer. Performance of a supercomputer is measured in floating-point operations per second (FLOPS) instead of million instructions per second (MIPS). As of 2017, there are supercomputers which can perform up to nearly a hundred quadrillions of FLOPS[3], measured in P(eta)FLOPS.[4] As of November 2017, all of the world's fastest 500 supercomputers run Linux-based operating systems