3 ms·

This is actually the only case where I tolerate performance regressions: where the previous implementation was actually incorrect, rather than merely old or in

This is actually the only case where I tolerate performance regressions: where the previous implementation was actually incorrect, rather than merely old or in need of a rewrite in whatever framework or technology is currently in vogue.

taeric 3y ago
Performance is part of the implementation. Therefore, if it regresses, it is silly to claim it was incorrect before. Seems more likely to claim that tradeoffs were made for performance. I'm ok with performance leaning on advances in the hardware. I'm also ok with performance dropping if you are pushing more pixels. But, we had high resolution displays years ago. Such that that is a tough hill to defend.
- ComputerGuru 3y ago
  Performance is a combination of a) required behavior, b) implementation. If an implementation does not correctly meet the requirements, its performance cannot be compared to one that does.
  - taeric 3y ago
    Close. Performance is also part of your "a", there. And you have to adjust implementation accordingly. Is why nobody says that old "3d" games like Doom were poorly implemented. Even if they were not fully 3d.
    - ComputerGuru 3y ago
      Sure. But I'm approaching this from the assumption that we're actually talking "observed/resultant performance" and not "baseline required performance," i.e. talking about "'excess' performance over the required threshold," and if that regresses due to a correctness issue, I don't see the problem. Now what is "the minimum required performance threshold," I cannot say, but it is surely at least the ability to render on "CPU" at 60Hz. (which CPU? render what? using how much of the available CPU power? with how many frames of latency allowed?) Note that I don't fundamentally disagree with you and I cringe when I hear issues dismissed as "premature optimizations" myself.
      - taeric 3y ago
        I think that is fair. I was approaching this from the perspective of "my old machine was responsive, it is becoming less so." Back on the example of Doom, I understood why my machine at the time couldn't run Quake. It would be frustrating to force everyone to that paradigm.

taeric 3y ago

Performance is part of the implementation. Therefore, if it regresses, it is silly to claim it was incorrect before. Seems more likely to claim that tradeoffs were made for performance. I'm ok with performance leaning on advances in the hardware. I'm also ok with performance dropping if you are pushing more pixels. But, we had high resolution displays years ago. Such that that is a tough hill to defend.

ComputerGuru 3y ago
Performance is a combination of a) required behavior, b) implementation. If an implementation does not correctly meet the requirements, its performance cannot be compared to one that does.
- taeric 3y ago
  Close. Performance is also part of your "a", there. And you have to adjust implementation accordingly. Is why nobody says that old "3d" games like Doom were poorly implemented. Even if they were not fully 3d.
  - ComputerGuru 3y ago
    Sure. But I'm approaching this from the assumption that we're actually talking "observed/resultant performance" and not "baseline required performance," i.e. talking about "'excess' performance over the required threshold," and if that regresses due to a correctness issue, I don't see the problem. Now what is "the minimum required performance threshold," I cannot say, but it is surely at least the ability to render on "CPU" at 60Hz. (which CPU? render what? using how much of the available CPU power? with how many frames of latency allowed?) Note that I don't fundamentally disagree with you and I cringe when I hear issues dismissed as "premature optimizations" myself.
    - taeric 3y ago
      I think that is fair. I was approaching this from the perspective of "my old machine was responsive, it is becoming less so." Back on the example of Doom, I understood why my machine at the time couldn't run Quake. It would be frustrating to force everyone to that paradigm.