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README.md	initial	2024-06-22 20:45:49 +08:00
gen_bench.sh	initial	2024-06-22 20:45:49 +08:00
linker_reloc_bench.cpp	initial	2024-06-22 20:45:49 +08:00
run_bench_with_ninja.sh	initial	2024-06-22 20:45:49 +08:00

README.md

Dynamic Linker Relocation Benchmark

This benchmark measures the time spent in the dynamic linker to load a large set of shared objects with many symbols and relocations. It mimics the work involved in loading a fixed version of libandroid_servers.so.

Running the benchmark

To run the benchmark, build the linker-reloc-bench target, sync data, and run the benchmark from /data/benchmarktest[64]/linker-reloc-bench.

There is also a run_bench_with_ninja.sh script that uses the gen_bench.py --ninja mode to generate a benchmark. It's useful for experimentation. The --cc and --linker flags allow swapping out different static and dynamic linkers.

Regenerating the synthetic benchmark

regen/dump_relocs.py scans an ELF file and its dependencies, outputting a JSON dump, then regen/gen_bench.py processes the JSON file into benchmark code. gen_bench.py has two modes:

(default) generate Android.bp and source files
with --ninja: generate a build.ninja instead, and build a set of ELF file outputs