As a quick follow up to the last post on malloc() speed comparisons, I decided to extend the size out a bit to cover malloc()ing up to 500M.
As you can see, once you make the jump up to mmap() (>256k), the cost is fairly well constant (give or take fluctuations). So it's not that huge memory buffers are terrible, just that there is a cost difference between the smaller and larger buffer sizes that may or may not matter in your case.
Time for 128k: 0.035259 Time for 256k: 0.009718 Time for 1M: 0.478129 Time for 5M: 0.968945 Time for 10M: 0.965172 Time for 50M: 0.674316 Time for 500M: 1.018901
As you can see, once you make the jump up to mmap() (>256k), the cost is fairly well constant (give or take fluctuations). So it's not that huge memory buffers are terrible, just that there is a cost difference between the smaller and larger buffer sizes that may or may not matter in your case.
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