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Add comments about stdout locking This is the source of some confusion regarding the `println!` macro: * https://llogiq.github.io/2017/06/01/perf-pitfalls.html#unbuffered-io * https://news.ycombinator.com/item?id=18794930 * https://reddit.com/r/rust/comments/5puyx2/why_is_println_so_slow/dcua5g5/ * https://reddit.com/r/rust/comments/ab7hsi/comparing_pythagorean_triples_in_c_d_and_rust/ecy7ql8/ In some of these cases it's not the locking behavior where the bottleneck lies, but it's still mentioned as a surprise when, eg, benchmarking a million `println!`'s in a very tight loop. If there's any stylistic problems please feel free to correct me! This is my first contribution and I want to get it right 🦀 |
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