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Add more numbers about MLIR binary sizes with the example binaries (NFC)

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Mehdi Amini 2023-07-26 16:12:45 -07:00
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mlir/examples/minimal-opt/README.md
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This folder contains example of minimal MLIR setup that can showcase the
intended binary footprint of the framework.
- mlir-cat: ~2MB
This includes the Core IR, the builtin dialect, the textual parser/printer,
the support for bytecode serialization.
- mlir-minimal-opt: ~3MB
This adds all the tooling for an mlir-opt tool: the pass infrastructure
and all the instrumentation associated with it.
- mlir-miminal-opt-canonicalize: ~4.8MB
This add the canonicalizer pass, which pulls in all the pattern/rewrite
machinery, including the PDL compiler and intepreter.
- mlir-cat: This includes the Core IR, the builtin dialect, the textual
parser/printer, the support for bytecode serialization.
- mlir-minimal-opt: This adds all the tooling for an mlir-opt tool: the pass
infrastructure and all the instrumentation associated with it.
- mlir-miminal-opt-canonicalize: This add the canonicalizer pass, which pulls in
all the pattern/rewrite machinery, including the PDL compiler and intepreter.
Below are some example measurements taken at the time of the LLVM 17 release,
using clang-14 on a X86 Ubuntu and [bloaty](https://github.com/google/bloaty).
| | Base | Os | Oz | Os LTO | Oz LTO |
| :------------------------------: | ------ | ------ | ------ | ------ | ------ |
| `mlit-cat` | 1018kB | 836KB | 879KB | 697KB | 649KB |
| `mlir-minimal-opt` | 1.54MB | 1.25MB | 1.29MB | 1.10MB | 1.00MB |
| `mlir-minimal-opt-canonicalizer` | 2.24MB | 1.81MB | 1.86MB | 1.62MB | 1.48MB |
Base configuration:
```
cmake ../llvm/ -G Ninja \
-DCMAKE_BUILD_TYPE=RelWithDebInfo \
-DLLVM_CCACHE_BUILD=ON \
-DLLVM_ENABLE_PROJECTS=mlir \
-DLLVM_BUILD_EXAMPLES=ON \
-DLLVM_TARGETS_TO_BUILD="Native" \
-DCMAKE_C_COMPILER=clang \
-DCMAKE_CXX_COMPILER=clang++ \
-DLLVM_ENABLE_LLD=ON \
-DLLVM_ENABLE_BACKTRACES=OFF \
-DCMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO=-Wl,-icf=all
```
Note: to measure the on-disk size, you need to run `strip bin/mlir-cat` first to
remove all the debug info (which are useful for `bloaty` though).
The optimization level can be tuned with `-Os` or `-Oz`:
- `-DCMAKE_C_FLAGS_RELWITHDEBINFO="-Os -g -DNDEBUG" -DCMAKE_CXX_FLAGS_RELWITHDEBINFO="-Os -g -DNDEBUG"`
- `-DCMAKE_C_FLAGS_RELWITHDEBINFO="-Oz -g -DNDEBUG" -DCMAKE_CXX_FLAGS_RELWITHDEBINFO="-Oz -g -DNDEBUG"`
Finally LTO can also be enabled with `-DLLVM_ENABLE_LTO=FULL`.
Bloaty can provide measurements using:
`bloaty bin/mlir-cat -d compileunits --domain=vm` or
`bloaty bin/mlir-cat -d symbols --demangle=full --domain=vm`