diff options
author | Abseil Team <absl-team@google.com> | 2020-09-18 15:55:15 -0700 |
---|---|---|
committer | Derek Mauro <dmauro@google.com> | 2020-09-24 13:47:15 -0400 |
commit | b56cbdd23834a65682c0b46f367f8679e83bc894 (patch) | |
tree | dacab9a64dd1a9e9668737e511d1a5420ff96001 /absl/strings/str_cat_benchmark.cc | |
parent | b832dce8489ef7b6231384909fd9b68d5a5ff2b7 (diff) |
Abseil LTS 2020092320200923
What's New:
* `absl::StatusOr<T>` has been released. See our [blog
post](https://abseil.io/blog/2020-091021-status) for more
information.
* Abseil Flags reflection interfaces have been released.
* Abseil Flags memory usage has been significantly optimized.
* Abseil now supports a "hardened" build mode. This build mode enables
runtime checks that guard against programming errors that may lead
to security vulnerabilities.
Notable Fixes:
* Sanitizer dynamic annotations like `AnnotateRWLockCreate` that are
also defined by the compiler sanitizer implementation are no longer
also defined by Abseil.
* Sanitizer macros are now prefixed with `ABSL_` to avoid naming collisions.
* Sanitizer usage is now automatically detected and no longer requires
macros like `ADDRESS_SANITIZER` to be defined on the command line.
Breaking Changes:
* Abseil no longer contains a `dynamic_annotations` library. Users
using a supported build system (Bazel or CMake) are unaffected by
this, but users manually specifying link libraries may get an error
about a missing linker input.
Baseline: 7680a5f8efe32de4753baadbd63e74e59d95bac1
Cherry picks: None
Diffstat (limited to 'absl/strings/str_cat_benchmark.cc')
-rw-r--r-- | absl/strings/str_cat_benchmark.cc | 49 |
1 files changed, 48 insertions, 1 deletions
diff --git a/absl/strings/str_cat_benchmark.cc b/absl/strings/str_cat_benchmark.cc index 14c63b3f..02c4dbe6 100644 --- a/absl/strings/str_cat_benchmark.cc +++ b/absl/strings/str_cat_benchmark.cc @@ -23,7 +23,7 @@ namespace { const char kStringOne[] = "Once Upon A Time, "; -const char kStringTwo[] = "There was a std::string benchmark"; +const char kStringTwo[] = "There was a string benchmark"; // We want to include negative numbers in the benchmark, so this function // is used to count 0, 1, -1, 2, -2, 3, -3, ... @@ -137,4 +137,51 @@ void BM_DoubleToString_By_SixDigits(benchmark::State& state) { } BENCHMARK(BM_DoubleToString_By_SixDigits); +template <typename... Chunks> +void BM_StrAppendImpl(benchmark::State& state, size_t total_bytes, + Chunks... chunks) { + for (auto s : state) { + std::string result; + while (result.size() < total_bytes) { + absl::StrAppend(&result, chunks...); + benchmark::DoNotOptimize(result); + } + } +} + +void BM_StrAppend(benchmark::State& state) { + const int total_bytes = state.range(0); + const int chunks_at_a_time = state.range(1); + const absl::string_view kChunk = "0123456789"; + + switch (chunks_at_a_time) { + case 1: + return BM_StrAppendImpl(state, total_bytes, kChunk); + case 2: + return BM_StrAppendImpl(state, total_bytes, kChunk, kChunk); + case 4: + return BM_StrAppendImpl(state, total_bytes, kChunk, kChunk, kChunk, + kChunk); + case 8: + return BM_StrAppendImpl(state, total_bytes, kChunk, kChunk, kChunk, + kChunk, kChunk, kChunk, kChunk, kChunk); + default: + std::abort(); + } +} + +template <typename B> +void StrAppendConfig(B* benchmark) { + for (int bytes : {10, 100, 1000, 10000}) { + for (int chunks : {1, 2, 4, 8}) { + // Only add the ones that divide properly. Otherwise we are over counting. + if (bytes % (10 * chunks) == 0) { + benchmark->Args({bytes, chunks}); + } + } + } +} + +BENCHMARK(BM_StrAppend)->Apply(StrAppendConfig); + } // namespace |