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Deduplicate Wasm optimization instructions (#14173)
See https://github.com/bevyengine/bevy-website/pull/1538 for context.
This commit is contained in:
Ben Frankel
GitHub
parent
ea2a7e5552
commit
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2 changed files with 16 additions and 100 deletions
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@ -256,61 +256,26 @@ In browsers, audio is not authorized to start without being triggered by an user
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### Optimizing
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On the web, it's useful to reduce the size of the files that are distributed.
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With rust, there are many ways to improve your executable sizes.
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Here are some.
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With rust, there are many ways to improve your executable sizes, starting with
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the steps described in [the quick-start guide](https://bevyengine.org/learn/quick-start/getting-started/setup/#compile-with-performance-optimizations).
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#### 1. Tweak your `Cargo.toml`
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Add a new [profile](https://doc.rust-lang.org/cargo/reference/profiles.html)
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to your `Cargo.toml`:
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```toml
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[profile.wasm-release]
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# Use release profile as default values
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inherits = "release"
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# Optimize with size in mind, also try "s", sometimes it is better.
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# This doesn't increase compilation times compared to -O3, great improvements
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opt-level = "z"
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# Do a second optimization pass removing duplicate or unused code from dependencies.
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# Slows compile times, marginal improvements
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lto = "fat"
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# When building crates, optimize larger chunks at a time
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# Slows compile times, marginal improvements
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codegen-units = 1
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```
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Now, when building the final executable, use the `wasm-release` profile
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by replacing `--release` by `--profile wasm-release` in the cargo command.
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Now, when building the executable, use `--profile wasm-release` instead of `--release`:
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```sh
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cargo build --profile wasm-release --example lighting --target wasm32-unknown-unknown
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```
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Make sure your final executable size is smaller, some of those optimizations
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may not be worth keeping, due to compilation time increases.
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#### 2. Use `wasm-opt` from the binaryen package
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Binaryen is a set of tools for working with wasm. It has a `wasm-opt` CLI tool.
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First download the `binaryen` package,
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then locate the `.wasm` file generated by `wasm-bindgen`.
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It should be in the `--out-dir` you specified in the command line,
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the file name should end in `_bg.wasm`.
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Then run `wasm-opt` with the `-Oz` flag. Note that `wasm-opt` is _very slow_.
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Note that `wasm-opt` optimizations might not be as effective if you
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didn't apply the optimizations from the previous section.
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To apply `wasm-opt`, first locate the `.wasm` file generated in the `--out-dir` of the
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earlier `wasm-bindgen-cli` command (the filename should end with `_bg.wasm`), then run:
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```sh
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wasm-opt -Oz --output optimized.wasm examples/wasm/target/lighting_bg.wasm
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mv optimized.wasm examples/wasm/target/lighting_bg.wasm
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```
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Make sure your final executable size is actually smaller. Some optimizations
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may not be worth keeping due to compilation time increases.
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For a small project with a basic 3d model and two lights,
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the generated file sizes are, as of July 2022, as follows:
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@ -323,13 +288,6 @@ the generated file sizes are, as of July 2022, as follows:
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|"z" + "thin" + codegen-units = 1 | 5.3M | 11M |
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|"z" + "fat" + codegen-units = 1 | 4.8M | 8.5M |
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There are more advanced optimization options available,
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check the following pages for more info:
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- <https://rustwasm.github.io/book/reference/code-size.html>
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- <https://rustwasm.github.io/docs/wasm-bindgen/reference/optimize-size.html>
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- <https://rustwasm.github.io/book/game-of-life/code-size.html>
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### Loading Assets
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To load assets, they need to be available in the folder examples/wasm/assets. Cloning this
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@ -664,61 +664,26 @@ In browsers, audio is not authorized to start without being triggered by an user
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### Optimizing
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On the web, it's useful to reduce the size of the files that are distributed.
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With rust, there are many ways to improve your executable sizes.
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Here are some.
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With rust, there are many ways to improve your executable sizes, starting with
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the steps described in [the quick-start guide](https://bevyengine.org/learn/quick-start/getting-started/setup/#compile-with-performance-optimizations).
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#### 1. Tweak your `Cargo.toml`
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Add a new [profile](https://doc.rust-lang.org/cargo/reference/profiles.html)
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to your `Cargo.toml`:
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```toml
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[profile.wasm-release]
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# Use release profile as default values
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inherits = "release"
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# Optimize with size in mind, also try "s", sometimes it is better.
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# This doesn't increase compilation times compared to -O3, great improvements
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opt-level = "z"
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# Do a second optimization pass removing duplicate or unused code from dependencies.
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# Slows compile times, marginal improvements
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lto = "fat"
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# When building crates, optimize larger chunks at a time
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# Slows compile times, marginal improvements
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codegen-units = 1
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```
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Now, when building the final executable, use the `wasm-release` profile
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by replacing `--release` by `--profile wasm-release` in the cargo command.
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Now, when building the executable, use `--profile wasm-release` instead of `--release`:
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```sh
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cargo build --profile wasm-release --example lighting --target wasm32-unknown-unknown
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```
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Make sure your final executable size is smaller, some of those optimizations
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may not be worth keeping, due to compilation time increases.
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#### 2. Use `wasm-opt` from the binaryen package
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Binaryen is a set of tools for working with wasm. It has a `wasm-opt` CLI tool.
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First download the `binaryen` package,
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then locate the `.wasm` file generated by `wasm-bindgen`.
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It should be in the `--out-dir` you specified in the command line,
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the file name should end in `_bg.wasm`.
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Then run `wasm-opt` with the `-Oz` flag. Note that `wasm-opt` is _very slow_.
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Note that `wasm-opt` optimizations might not be as effective if you
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didn't apply the optimizations from the previous section.
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To apply `wasm-opt`, first locate the `.wasm` file generated in the `--out-dir` of the
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earlier `wasm-bindgen-cli` command (the filename should end with `_bg.wasm`), then run:
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```sh
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wasm-opt -Oz --output optimized.wasm examples/wasm/target/lighting_bg.wasm
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mv optimized.wasm examples/wasm/target/lighting_bg.wasm
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```
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Make sure your final executable size is actually smaller. Some optimizations
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may not be worth keeping due to compilation time increases.
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For a small project with a basic 3d model and two lights,
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the generated file sizes are, as of July 2022, as follows:
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@ -731,13 +696,6 @@ the generated file sizes are, as of July 2022, as follows:
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|"z" + "thin" + codegen-units = 1 | 5.3M | 11M |
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|"z" + "fat" + codegen-units = 1 | 4.8M | 8.5M |
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There are more advanced optimization options available,
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check the following pages for more info:
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- <https://rustwasm.github.io/book/reference/code-size.html>
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- <https://rustwasm.github.io/docs/wasm-bindgen/reference/optimize-size.html>
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- <https://rustwasm.github.io/book/game-of-life/code-size.html>
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### Loading Assets
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To load assets, they need to be available in the folder examples/wasm/assets. Cloning this
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