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I am trying to write a file as fast as I can through a buffered FileChannel similar to a BufferedOutputStream. I am wondering what is the optimum chunk of data I should use per write call to maximize bandwidth? I am on Ubuntu Linux.
There is no such thing as a “one size fits all” perfect answer on a question like this.
This sort of thing is impossible to predict.
It depends on the disk, controller, CPU, application, OS, other system load, kernel version, filesystem used and probably about a dozen other things I can’t quickly remember right now.
Often bigger is better, but there usually is a point of diminishing returns.
Trial and error is, for any given system, the only way to say for sure.
Even if you figure this out for your development environment, you will have to do it all again for every other system on which the software needs to run.
Best to do some limited testing and then pick a “reasonable” value that performs “well enough” on the majority of intended target systems.