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Old 2017-12-01, 01:23   #6
Dubslow
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"Bunslow the Bold"
Jun 2011
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Quote:
Originally Posted by ATH View Post
Long ago I calculated 1 Ghz-days to be ~ 171 TeraFLOP (Not FLOPS)
Post #7 and #25 in this old thread:
http://www.mersenneforum.org/showthread.php?t=10235

Now we can calculate it more easily from here:
https://www.mersenne.org/primenet/

Under "Aggregate Computing Power" - "Today, last 24 hours" we can see that:

123137 Ghz-Days = 246.275 TFLOP/sec * 86400 sec = 21278160 TFLOP =>
1 Ghz-Days = 21278160 TFLOP / 123137 = 172.8 TFLOP

We can test "last 7 days" and "last 30 days" to see if we get the same results:

994150 Ghz-Days = 284.043 TFLOP/s * 86400s/day * 7 days =>
1 Ghz-Days = 172.8 TFLOP


4395208 Ghz-Days = 293.014 TFLOP/s * 86400s/day * 30 days =>
1 Ghz-Days = 172.8 TFLOP
That number, 172.8, is not a coincidence: it is in fact exactly (24*60*60)/500, which is another way of saying that 1 EGHz (1 [Core 2] Equivalent GHz, = 1GHz-day/day) is exactly 2 GFLOPS. Not sure which unit is defining the other, but that looks like the definition used by PrimeNet. Does anyone have an old Core 2 lying around?


So a 100 EGHz CPU (?? GPU?) is doing 200 GFLOPS according to the PrimeNet definition of EGHz and FLOP. I'm not sure how these line up to an actual Core 2 or to the "standard" definitions of FLOP.

Last fiddled with by Dubslow on 2017-12-01 at 01:25
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