There's a flaw in your argumentation.
- Your assertion is: CPU speed is increasing faster than memory bandwidth.
- Your example shows: IO speed is an order of magnitude lower than memory bandwidth.
- But by all we know at this point, if your dataset was smaller or your memory larger the 1000% overhead approach would beat a 30% overhead one.
Point 3 refutes point 1, with point 2 bearing no relevance to either. All you have proven is:
You can trade memory to gain speed - so long as you have enough memory.
That, I believe, isn't news to anyone. The fact that the 1000% overhead forced you to go for disk IO rather than all-in-memory is irrelevant because it doesn't have any impact on the relation between CPU speed and memory bandwidth.
You do have a point in complaining about the high overhead approach forcing you to take refuge in disk IO, but that's an entirely different argument from saying that trading memory for clock cycles will backfire when an application fits in memory.
Which of these two different points do you want to discuss?
Makeshifts last the longest.
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