The benchmark creates a set of DSOs that mimic the work involved in
loading the current version of libandroid_servers.so. The synthetic
benchmark has roughly the same number of libraries with roughly the same
relocations.
Currently, on a local aosp_walleye build that includes recent performance
improvements (including the Neon-based CL
I3983bca1dddc9241bb70290ad3651d895f046660), using the "performance"
governor, the benchmark reports these scores:
$ adb shell taskset 10 \
/data/benchmarktest64/linker-reloc-bench/linker-reloc-bench \
--benchmark_repetitions=20 --benchmark_display_aggregates_only=true
...
--------------------------------------------------------------------------------
Benchmark Time CPU Iterations
--------------------------------------------------------------------------------
BM_linker_relocation/real_time_mean 70048 us 465 us 20
BM_linker_relocation/real_time_median 70091 us 466 us 20
BM_linker_relocation/real_time_stddev 329 us 8.29 us 20
$ adb shell taskset 10 \
/data/benchmarktest/linker-reloc-bench/linker-reloc-bench \
--benchmark_repetitions=20 --benchmark_display_aggregates_only=true
...
--------------------------------------------------------------------------------
Benchmark Time CPU Iterations
--------------------------------------------------------------------------------
BM_linker_relocation/real_time_mean 83051 us 462 us 20
BM_linker_relocation/real_time_median 83069 us 464 us 20
BM_linker_relocation/real_time_stddev 184 us 8.91 us 20
Test: manual
Bug: none
Change-Id: I6dac66978f8666f95c76387093bda6be0151bfce
