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Benchmark parsing of pretty-printed JSON

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Every input in the benchmark corpus is minified or only lightly spaced, so
none of them exercise the lexer's whitespace handling. Real-world JSON is
frequently indented - configuration files, pretty-printed API responses,
anything kept under version control - where the insignificant whitespace can
outweigh the data itself.

Add a ParseIndented family that re-serializes each document with an
indentation and parses that. The content is identical to the matching
ParseString row, so the pair isolates the cost of the whitespace alone.
Measured here, parsing the indented form costs 16-34% more than the minified
form of the same document, which nothing in the suite currently reports.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-09-02 23:09:41 +02:00
parent 09ae666612
commit 5cd24f6183
1 changed files with 38 additions and 0 deletions
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tests/benchmarks/src/benchmarks.cpp
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@@ -81,6 +81,44 @@ BENCHMARK_CAPTURE(ParseString, signed_ints, TEST_DATA_DIRECTORY "/regressi
BENCHMARK_CAPTURE(ParseString, unsigned_ints, TEST_DATA_DIRECTORY "/regression/unsigned_ints.json");
BENCHMARK_CAPTURE(ParseString, small_signed_ints, TEST_DATA_DIRECTORY "/regression/small_signed_ints.json");
//////////////////////////////////////////////////////////////////////////////
// parse pretty-printed JSON from string
//
// Every file in the corpus above is minified or only lightly spaced, so none of
// them exercise the lexer's whitespace handling. Real-world JSON is frequently
// indented - configuration files, pretty-printed API responses, anything kept
// under version control - where insignificant whitespace can outweigh the data.
// Re-serializing a document with an indentation and parsing that keeps the
// content identical to the ParseString row above, so the pair isolates the cost
// of the whitespace alone.
//////////////////////////////////////////////////////////////////////////////
static void ParseIndented(benchmark::State& state, const char* filename, int indent)
{
std::ifstream f(filename);
std::string str((std::istreambuf_iterator<char>(f)), std::istreambuf_iterator<char>());
const std::string indented = json::parse(str).dump(indent);
while (state.KeepRunning())
{
state.PauseTiming();
auto* j = new json();
state.ResumeTiming();
*j = json::parse(indented);
state.PauseTiming();
delete j;
state.ResumeTiming();
}
state.SetBytesProcessed(state.iterations() * indented.size());
}
BENCHMARK_CAPTURE(ParseIndented, jeopardy / 4, TEST_DATA_DIRECTORY "/jeopardy/jeopardy.json", 4);
BENCHMARK_CAPTURE(ParseIndented, canada / 4, TEST_DATA_DIRECTORY "/nativejson-benchmark/canada.json", 4);
BENCHMARK_CAPTURE(ParseIndented, citm_catalog / 4, TEST_DATA_DIRECTORY "/nativejson-benchmark/citm_catalog.json", 4);
BENCHMARK_CAPTURE(ParseIndented, twitter / 4, TEST_DATA_DIRECTORY "/nativejson-benchmark/twitter.json", 4);
//////////////////////////////////////////////////////////////////////////////
// serialize JSON
//////////////////////////////////////////////////////////////////////////////