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Add benchmarks for SAX parsing, value operations, JSON Pointer, and conversions

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The benchmark suite covered only parsing, serialization, and the binary formats.
Add benchmarks for SAX parsing without building values, copying, destroying,
comparing and iterating documents, flatten()/unflatten() (also for ordered_json),
diff() and patch(), JSON Pointer parsing, printing and lookup, and conversions
from and to standard containers. They use only API that 3.12.0 also has, so
releases can be compared on them.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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Niels Lohmann committed 2026-10-15 09:43:03 +02:00
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tests/benchmarks/README.md
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@@ -16,6 +16,13 @@ Micro-benchmarks for parsing, serialization and the binary formats, written with
| `FromBinaryBuffer`, `FromBinaryFile` | read CBOR, MessagePack, UBJSON, BJData and BSON from a buffer or a `FILE*` |
| `FromBinaryShape` | read deeply nested, container-heavy and scalar-heavy documents in every binary format |
| `FromCborChunkedString` | read CBOR strings split into indefinite-length chunks |
| `SaxParse` | parse with a SAX handler that only counts events, so no values are built |
| `Copy`, `Destroy`, `Equal`, `Iterate` | copy, destroy, or compare a parsed document, or visit every value with range-based `for` loops |
| `Flatten`, `FlattenOrdered`, `Unflatten` | `flatten()` for `json` and `ordered_json`, and `unflatten()` |
| `Diff`, `Patch` | `diff()` against the document with every eighth scalar changed, and applying that patch |
| `JsonPointerParse`, `JsonPointerToString`, `JsonPointerAt`, `JsonPointerContains` | the JSON pointers of every scalar in a document: parse them from strings, turn them back into strings, look them up with `at()` and `contains()` |
| `GetVectorInt`, `GetVectorDouble`, `GetMap` | `get<std::vector<std::int64_t>>()`, `get<std::vector<double>>()` and `get<std::map<std::string, json>>()` on large arrays and a large flat object |
| `ToJsonStrings` | create a `json` array from a `std::vector` of 100,000 strings, copied or moved |
The input files are those of [nativejson-benchmark](https://github.com/miloyip/nativejson-benchmark) (`canada`,
`citm_catalog`, `twitter`), a large `jeopardy` file, and number-heavy files (`floats`, `signed_ints`, ...).