5 ms·

AOT overhead 200MB (ensuring app loads fast) Frameworks 150MB Assets for all screen resolutions 50MB Google Meet/Chat/etc 100MB AI models 25MB

einpoklum 10mo ago
AOT = Ahead Of Time? Attack On Titan? Something else?
- kachapopopow 10mo ago
  it's ahead of time and AOT compilation is done at OS startup, not sure if that is being measured here.
  - efficax 10mo ago
    OS startup? AOT compilation happens in the build pipeline, before the app is distributed.
    - chasd00 10mo ago
      Wouldn't compilation during the build process be ROT? As in, "Right On Time" compilation? Build is where the compilation step is usually performed.
      - jeroenhd 10mo ago
        I don't think iOS does any on-device or in-app-store compilation since Apple deprecated Bitcode.
    - kachapopopow 10mo ago
      AOT is unique because you want to compile it with all the capabilities your device has, so there still has to be some complication done, especially when you have processors that have brand new instructions to make operations significantly more efficient.
      - MaxBarraclough 10mo ago
        That's not the approach they're referring to, iOS doesn't support that. They're referring to delivering the compiled native code as part of the app package.
- wiseowise 10mo ago
  Mobile applications need to be AOT (Ahead of Time) compiled for the target device to have optimal performance.
- CGMthrowaway 10mo ago
  https://en.wikipedia.org/wiki/Ahead-of-time_compilation https://en.wikipedia.org/wiki/Ahead-of-time_compilation
  - lucianbr 10mo ago
    Didn't this use to be called "compilation"?
    - orthoxerox 10mo ago
      Yes, and landline phones used to be called "phones".
    - tasty_freeze 10mo ago
      Yes, but then JIT (just in time) compilation became commonplace, so now it is often useful to distinguish between AOT and JIT.
taeric 10mo ago
I find "ensuring app loads fast" to be absolutely hilarious, here. What has to be done to help a mail app load fast? And, snarkily, can they do this for the web page? On my decent connection right now, loading a new tab to gmail takes about 3 seconds to visibly load. Another few seconds to get so that I can interact with it. Is kind of hilarious to see how long it takes to load the compose window if I press "c" as soon as I see any of the app has loaded.
- CGMthrowaway 10mo ago
  Starting with machine code expands lines of code 2-10x. It's also taking helper functions and pre-evaluating them putting results inline, and unrolls loops (could be 5-50x increase where they exist?) And it precalculates lookup tables (takes up space) for virtual methods.
  - taeric 10mo ago
    Right, I know what sort of things happen in that process. And to be fair, I'm mainly poking fun at how bad the web page has become. I do feel that this bloat is, far and away, the worst offender when it comes to why things feel slower nowadays. The application just flat out does way more than most people assume it can. Which means it almost certainly has way more capabilities than it needs for many of us. Would be neat to see a metric on "how much of the code is never loaded" in typical use. Akin to some game medals of "played more than x% of players."
xigoi 10mo ago
> OT overhead 200MB (ensuring app loads fast) Yet there is a positive correlation between size and startup time…

einpoklum 10mo ago

AOT = Ahead Of Time? Attack On Titan? Something else?

kachapopopow 10mo ago
it's ahead of time and AOT compilation is done at OS startup, not sure if that is being measured here.
- efficax 10mo ago
  OS startup? AOT compilation happens in the build pipeline, before the app is distributed.
  - chasd00 10mo ago
    Wouldn't compilation during the build process be ROT? As in, "Right On Time" compilation? Build is where the compilation step is usually performed.
    - jeroenhd 10mo ago
      I don't think iOS does any on-device or in-app-store compilation since Apple deprecated Bitcode.
  - kachapopopow 10mo ago
    AOT is unique because you want to compile it with all the capabilities your device has, so there still has to be some complication done, especially when you have processors that have brand new instructions to make operations significantly more efficient.
    - MaxBarraclough 10mo ago
      That's not the approach they're referring to, iOS doesn't support that. They're referring to delivering the compiled native code as part of the app package.
wiseowise 10mo ago
Mobile applications need to be AOT (Ahead of Time) compiled for the target device to have optimal performance.
CGMthrowaway 10mo ago
https://en.wikipedia.org/wiki/Ahead-of-time_compilation https://en.wikipedia.org/wiki/Ahead-of-time_compilation
- lucianbr 10mo ago
  Didn't this use to be called "compilation"?
  - orthoxerox 10mo ago
    Yes, and landline phones used to be called "phones".
  - tasty_freeze 10mo ago
    Yes, but then JIT (just in time) compilation became commonplace, so now it is often useful to distinguish between AOT and JIT.

taeric 10mo ago

I find "ensuring app loads fast" to be absolutely hilarious, here. What has to be done to help a mail app load fast? And, snarkily, can they do this for the web page? On my decent connection right now, loading a new tab to gmail takes about 3 seconds to visibly load. Another few seconds to get so that I can interact with it. Is kind of hilarious to see how long it takes to load the compose window if I press "c" as soon as I see any of the app has loaded.

CGMthrowaway 10mo ago
Starting with machine code expands lines of code 2-10x. It's also taking helper functions and pre-evaluating them putting results inline, and unrolls loops (could be 5-50x increase where they exist?) And it precalculates lookup tables (takes up space) for virtual methods.
- taeric 10mo ago
  Right, I know what sort of things happen in that process. And to be fair, I'm mainly poking fun at how bad the web page has become. I do feel that this bloat is, far and away, the worst offender when it comes to why things feel slower nowadays. The application just flat out does way more than most people assume it can. Which means it almost certainly has way more capabilities than it needs for many of us. Would be neat to see a metric on "how much of the code is never loaded" in typical use. Akin to some game medals of "played more than x% of players."

xigoi 10mo ago

> OT overhead 200MB (ensuring app loads fast) Yet there is a positive correlation between size and startup time…