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This post is auto-generated from RSS feed The Rust Programming Language Forum - Latest topics. Source: Println!() vs write!() + std::io::stdout().lock()

Context: figuring out the less-than-obvious parts of std.

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Getting some mixed results from the use of println!(...) macro vs manual locking of the std::io::stdout() before calling the write!(...) on the lock() of the Stdout itself.

Sample code is here.

Question: how come the playground's execution is on the order of a few ms - regardless of whether it's a Debug or Release mode, while on my own local Win10 the println!() easily takes around 100+ ms, with the write!() into the StdoutLock<'_> is taking 1.25x to 1.5x+ as much?

That last bit is particularly surprising. Shouldn't println!() always be slower?

from my terminal (click for more details)

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