8d88471c46
LLVM PGO (Profile-Guided Optimization) allows the compiler to better optimize code
for how it actually runs. This PR implements the AOT static PGO, and is tested on
Linux x86-64 and x86-32. The basic steps are:
1. Use `wamrc --enable-llvm-pgo -o <aot_file_of_pgo> <wasm_file>`
to generate an instrumented aot file.
2. Compile iwasm with `cmake -DWAMR_BUILD_STATIC_PGO=1` and run
`iwasm --gen-prof-file=<raw_profile_file> <aot_file_of_pgo>`
to generate the raw profile file.
3. Run `llvm-profdata merge -output=<profile_file> <raw_profile_file>`
to merge the raw profile file into the profile file.
4. Run `wamrc --use-prof-file=<profile_file> -o <aot_file> <wasm_file>`
to generate the optimized aot file.
5. Run the optimized aot_file: `iwasm <aot_file>`.
The test scripts are also added for each benchmark, run `test_pgo.sh` under
each benchmark's folder to test the AOT static pgo.
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|---|---|---|
| .. | ||
| build.sh | ||
| jetstream.patch | ||
| README.md | ||
| run_aot.sh | ||
| test_pgo.sh | ||
| tsf.patch | ||
Introduction
JetStream 2 is a JavaScript and WebAssembly benchmark suite focused on the most advanced web applications. It rewards browsers that start up quickly, execute code quickly, and run smoothly.
Source: https://browserbench.org/JetStream/in-depth.html
Building
Please build iwasm and wamrc, refer to:
And install emsdk, refer to the guide. Don't forget to activate emsdk and set up environment variables. For example, use instructions below to install it under /opt and activate it:
$ cd /opt
$ git clone https://github.com/emscripten-core/emsdk.git
$ cd emsdk
$ git pull
$ ./emsdk install latest
$ ./emsdk activate latest
$ echo "source /opt/emsdk/emsdk_env.sh" >> "${HOME}"/.bashrc
And then run ./build.sh to build the source code, the folder out will be created and files will be generated under it.
Running
Run ./run_aot.sh to test the benchmark, the native mode and iwasm aot mode will be tested for each workload, and the file report.txt will be generated.
Run ./test_pgo.sh to test the benchmark with AOT static PGO (Profile-Guided Optimization) enabled, please refer here to install tool llvm-profdata and build iwasm with cmake -DWAMR_BUILD_STATIC_PGO=1.