For a computer that took a variable number of clock cycles to execute floating point instructions, what would be the formula to estimate its performance in FLOPS assuming that it can execute either A add instructions, or M multiply instructions, or D divide instructions per second in average?
Is it reasonable to use just the value of M, as was done in the first line of the table, using "About 2400 IBM 7030 Stretch supercomputers [...] IBM 7030 Stretch performs one floating-point multiply every 2.4 microseconds." to represent the performance of 1 GFLOPS, or were there better formulas?
Also, converting from Whetstones to FLOPS appears unreliable. The ratio of MWIPS to MFLOPS in this table varies substantially even for the same family of processors.
I don't care that In the past, FLOPS was considered a marketing term and thus subject to rather over-optimistic reporting, as mentioned in an answer below. I'm asking how it was computed.