fs.promises.readFile is 40% slower than fs.readFile

Re:fs.promises.readFile is 40% slower than fs.readFile by orf on Wednesday March 03, 2021 @05:19PM (#26335544)

It depends - I would assume the callback pattern is much easier to JIT than the promise pattern and requires less objects to be allocated, but you’re right. That’s a huge difference.

You’d need to benchmark another non-io bound function to find how much overhead comes from promises themselves.

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Re:fs.promises.readFile is 40% slower than fs.readFile by beaconstudios on Wednesday March 03, 2021 @05:22PM (#26335588)

Not enough to add 40% overhead to a 1mb file read, I can tell you that much.

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Re:fs.promises.readFile is 40% slower than fs.readFile by javajosh on Wednesday March 03, 2021 @07:43PM (#26337092)

It depends. If disks got so fast that function call overhead starts to dominate, then you might see an effect like this. But I have to imagine reading from an SSD is still 1000x slower (at least) than a function invocation in Javascript.

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Re:fs.promises.readFile is 40% slower than fs.readFile by beaconstudios on Wednesday March 03, 2021 @08:24PM (#26337408)

I don't see that basically ever being the case.

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