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Comment by _ph_ | Hacker News Reader

Why do you think it is? Go has a really great gc which mostly runs in parallel to your program with gc stops only in the doman of less than milliseconds. Discord ran into a corner case where they did not create enough garbage to trigger gc cycles, but had a performance impact due to scheduled gc cycles for returning memory to the OS (which they wouldn't need to do either).

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Because many services eventually become performance bottlenecked either via accumulation of users or accumulation of features. In either case eventually performance becomes very critical.

Sure, but that doesn't make Go unsuitable for those tasks on a fundamental basis. Go is very high performance. Whether Go or another language is the best match very much depends on the problem at hand and the especial requirements. Even in the described case they might have tweaked the GC to fit their bill.

GC pauses aside can Go match the performance of Rust when coded properly? Would sorting an array of structs in Go be in the same ballpark as sorting the same sized array of structures in Rust? I don't know a whole lot about how Go manages the heap under the covers.

Sure. That kind of code is very similar in both languages.

Rust will probably be faster because it benefits from optimizations in LLVM that Go likely doesn't have.

Go arrays of structs are contiguous, not indirect pointers.

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