Comment by FraaJad | Hacker News Reader

Comment by FraaJad | Hacker News Reader

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I wouldn't be very sure about the claim that "D can never compete with Rust in performance and real-time or soft-real-time systems". If anything, due to much better metaprogramming (as you mention), you can have D programs that ARE faster than Rust (eg: see JSON parsing benchmark [1]).

You can write programs in D that have ZERO garbage collection.

In fact, the core libraries (phobos) are being actively rewritten to remove GC altogether.

[1]: https://github.com/kostya/benchmarks#json

The D "fastjson" version is not a general solution:

  > I think it is not necessary to validate data you are not using. So basically
  > I only scan them so much as to find where they end. Granted it is a bit of
  > optimization for a benchmark, but is actually handy in real-life as well.
  > After all you could still raise the validation level to maximum if you really
  > cared or call one of the validation functions.

https://github.com/kostya/benchmarks/pull/46#issuecomment-14...

shameless plug, you can use https://github.com/tamediadigital/asdf it should offer comparable performance to fastjson while having all the nice features.

Last I checked, JSON parsing is not a typical (soft-)real-time workload. Heck, GC probably doesn't even kick in in that JSON benchmark.

And yes, I'm aware that Phobos is being rewritten to remove GC. I'll reevaluate D when that's complete.

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