A petaflop is a quadrillion floating-point operations per second.
Department of Energy's Los Alamos National Laboratory, was the first system to reach 1.026 petaflops (a petaflop is equal to a quadrillion calculations per second; the "flops" stands for floating point operations per second).— Top Stories - Google News
The fastest systems today can only reach 1 petaflop, a remarkable achievement in its own right that was met only last year.— Latest from Computerworld
A teraflop equals a trillion floating points a second; a petaflop is— Latest from Computerworld
Sequoia, due to be delivered in 2011 and operational in 2012, will be a 20 petaflop (define) system that fits into just 3,500 square feet, roughly the same size as BlueGene / L, but it will have 40 times the compute power, according to Dave Turek, vice president of Deep Computing at IBM.— Internet News

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