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A comment on What Every Programmer Should Know About Memory (2007) [pdf]. Parent comment

Re:What Every Programmer Should Know About Memory (2007) [pdf] by 3JPLW on Monday March 04, 2019 @03:00PM (#19304752)
Sure, you don't really need to know any of this stuff unless you're actually needing to optimize code beyond the lowest hanging fruit.

My list presupposes you've hit a wall and need the best performance you can get. That's not always the case, but I certainly wouldn't say that these optimizations don't make a difference in the "real world of softare."

False sharing alone can be the difference between a 16x parallelization speedup and a 1000x+ slowdown over the naive serial algorithm. 16x can be the difference between actionable results tomorrow or three weeks from today... and if you didn't know about it, the 1000x+ slowdown would be otherwise inscrutable.

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Re:What Every Programmer Should Know About Memory (2007) [pdf] by cortesoft on Monday March 04, 2019 @06:05PM (#19306559)
Right, the question then becomes "What percentage of programmers are going to need to optimize code beyond the lowest hanging fruit"

I don't know exactly what that number is going to be, but I do know it is going to be a lot less than 100%.

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