The benchmark calls __cxa_atexit 100000 times, then either exits early
without calling the destructors (_Exit) or exits normally, calling them
(exit).
Test: mmma bionic/benchmarks/spawn
Change-Id: I41fe702d6ef11acb7a1dec95bf546b5dc693bd4a
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
This reverts commit 3bf27c86d1.
Disable the 32-bit glibc target. We're not interested in benchmarking that
target, and the bench_noop_nostl executable doesn't build when ASAN is
turned on, because the libclang_rt.asan_cxx-i386.a lib contains
ubsan_type_hash_itanium.cc.o, which needs __dynamic_cast and various
STL typeinfo variables. The equivalent libclang_rt.asan_cxx-x86_64.a
lib doesn't have ubsan_type_hash_itanium.cc.o in it.
Bug: http://b/141693636
Test: m bench_noop_nostl bench_noop bench_noop_static ASAN_OPTIONS=detect_leaks=0 SANITIZE_HOST=address
Change-Id: Id6de17e622682f3a166367ad670cba5bfa6aee47
Specifically, test the wall-clock time for running:
* a C program that does nothing (i.e. no STL)
* a C++ program that does nothing
* a statically-linked C++ program
* toybox true (in /system/bin and /vendor/bin)
* mksh -c true (in /system/bin and /vendor/bin)
Test: bionic-spawn-benchmarks
Change-Id: I961850ec90004cac83088feab5783f4f27768be1
