[libcxx-commits] [libcxx] 1026944 - [libc++] Reduce the number of runs on the format_to{, n} and formatted_size benchmarks (#179922)

[via libcxx-commits]

Author: Nikolas Klauser
Date: 2026-02-09T15:36:58+01:00
New Revision: 1026944313daa82e68094b446d208a24906f8af0

URL: https://github.com/llvm/llvm-project/commit/1026944313daa82e68094b446d208a24906f8af0
DIFF: https://github.com/llvm/llvm-project/commit/1026944313daa82e68094b446d208a24906f8af0.diff

LOG: [libc++] Reduce the number of runs on the format_to{,n} and formatted_size benchmarks (#179922)

Testing a bunch of sizes has relatively little value. This reduces the
number of benchmarks so we can run them on a regular basis. This saves
~8 minutes when running the benchmarks.

Added: 
    

Modified: 
    libcxx/test/benchmarks/format/format_to.bench.cpp
    libcxx/test/benchmarks/format/format_to_n.bench.cpp
    libcxx/test/benchmarks/format/formatted_size.bench.cpp

Removed: 
    


################################################################################
diff  --git a/libcxx/test/benchmarks/format/format_to.bench.cpp b/libcxx/test/benchmarks/format/format_to.bench.cpp
index 5b06e826715e7..d1cbb49cad4e2 100644
--- a/libcxx/test/benchmarks/format/format_to.bench.cpp
+++ b/libcxx/test/benchmarks/format/format_to.bench.cpp
@@ -84,24 +84,24 @@ static void BM_format_to_string_pointer(benchmark::State& state) {
 
 /*** Main ***/
 
-BENCHMARK(BM_format_to_string_back_inserter<std::string>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_string_back_inserter<std::vector<char>>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_string_back_inserter<std::list<char>>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_string_begin<std::string>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_string_begin<std::vector<char>>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_string_begin<std::list<char>>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_string_span<char>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_string_pointer<char>)->RangeMultiplier(2)->Range(1, 1 << 20);
+BENCHMARK(BM_format_to_string_back_inserter<std::string>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_string_back_inserter<std::vector<char>>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_string_back_inserter<std::list<char>>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_string_begin<std::string>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_string_begin<std::vector<char>>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_string_begin<std::list<char>>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_string_span<char>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_string_pointer<char>)->Arg(1)->Arg(16384)->Arg(1048576);
 
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
-BENCHMARK(BM_format_to_string_back_inserter<std::wstring>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_string_back_inserter<std::vector<wchar_t>>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_string_back_inserter<std::list<wchar_t>>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_string_begin<std::wstring>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_string_begin<std::vector<wchar_t>>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_string_begin<std::list<wchar_t>>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_string_span<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_string_pointer<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20);
+BENCHMARK(BM_format_to_string_back_inserter<std::wstring>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_string_back_inserter<std::vector<wchar_t>>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_string_back_inserter<std::list<wchar_t>>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_string_begin<std::wstring>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_string_begin<std::vector<wchar_t>>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_string_begin<std::list<wchar_t>>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_string_span<wchar_t>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_string_pointer<wchar_t>)->Arg(1)->Arg(16384)->Arg(1048576);
 #endif
 
 BENCHMARK_MAIN();

diff  --git a/libcxx/test/benchmarks/format/format_to_n.bench.cpp b/libcxx/test/benchmarks/format/format_to_n.bench.cpp
index 30f6ce74f7c93..748c72f2c2866 100644
--- a/libcxx/test/benchmarks/format/format_to_n.bench.cpp
+++ b/libcxx/test/benchmarks/format/format_to_n.bench.cpp
@@ -84,24 +84,24 @@ static void BM_format_to_n_string_pointer(benchmark::State& state) {
 
 /*** Main ***/
 
-BENCHMARK(BM_format_to_n_string_back_inserter<std::string>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_n_string_back_inserter<std::vector<char>>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_n_string_back_inserter<std::list<char>>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_n_string_begin<std::string>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_n_string_begin<std::vector<char>>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_n_string_begin<std::list<char>>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_n_string_span<char>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_n_string_pointer<char>)->RangeMultiplier(2)->Range(1, 1 << 20);
+BENCHMARK(BM_format_to_n_string_back_inserter<std::string>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_n_string_back_inserter<std::vector<char>>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_n_string_back_inserter<std::list<char>>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_n_string_begin<std::string>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_n_string_begin<std::vector<char>>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_n_string_begin<std::list<char>>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_n_string_span<char>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_n_string_pointer<char>)->Arg(1)->Arg(16384)->Arg(1048576);
 
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
-BENCHMARK(BM_format_to_n_string_back_inserter<std::wstring>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_n_string_back_inserter<std::vector<wchar_t>>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_n_string_back_inserter<std::list<wchar_t>>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_n_string_begin<std::wstring>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_n_string_begin<std::vector<wchar_t>>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_n_string_begin<std::list<wchar_t>>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_n_string_span<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20);
-BENCHMARK(BM_format_to_n_string_pointer<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20);
+BENCHMARK(BM_format_to_n_string_back_inserter<std::wstring>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_n_string_back_inserter<std::vector<wchar_t>>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_n_string_back_inserter<std::list<wchar_t>>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_n_string_begin<std::wstring>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_n_string_begin<std::vector<wchar_t>>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_n_string_begin<std::list<wchar_t>>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_n_string_span<wchar_t>)->Arg(1)->Arg(16384)->Arg(1048576);
+BENCHMARK(BM_format_to_n_string_pointer<wchar_t>)->Arg(1)->Arg(16384)->Arg(1048576);
 #endif
 
 BENCHMARK_MAIN();

diff  --git a/libcxx/test/benchmarks/format/formatted_size.bench.cpp b/libcxx/test/benchmarks/format/formatted_size.bench.cpp
index e244f0bbb8cb2..9c52f386a782a 100644
--- a/libcxx/test/benchmarks/format/formatted_size.bench.cpp
+++ b/libcxx/test/benchmarks/format/formatted_size.bench.cpp
@@ -28,9 +28,9 @@ static void BM_formatted_size_string(benchmark::State& state) {
 
   state.SetBytesProcessed(state.iterations() * size * sizeof(CharT));
 }
-BENCHMARK(BM_formatted_size_string<char>)->RangeMultiplier(2)->Range(1, 1 << 20);
+BENCHMARK(BM_formatted_size_string<char>)->Arg(1)->Arg(16384)->Arg(1048576);
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
-BENCHMARK(BM_formatted_size_string<wchar_t>)->RangeMultiplier(2)->Range(1, 1 << 20);
+BENCHMARK(BM_formatted_size_string<wchar_t>)->Arg(1)->Arg(16384)->Arg(1048576);
 #endif
 
 BENCHMARK_MAIN();