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Add benchmarks for SAX parsing, value operations, JSON Pointer, and conversions (#5845)

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Squashed onto develop cd6b428ef (CI fixes from #5860). Original commits:

- Add benchmarks for SAX parsing, value operations, JSON Pointer, and conversions
- Time copies together with their destruction in the benchmarks
- Time destroying the json in ToJsonStrings

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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Niels Lohmann authored and GitHub committed 2026-10-21 12:25:42 +02:00
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tests/benchmarks/README.md
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@@ -22,6 +22,15 @@ Micro-benchmarks for parsing, serialization and the binary formats, written with
| `ViewAccept` | validate with `json_document::accept`; compare with `Accept` |
| `ViewMaterialize` | convert a parsed `json_document` into a `json` value |
| `ViewDump` | serialize a parsed `json_document`; compare with `Dump` |
| `SaxParse` | parse with a SAX handler that only counts events, so no values are built |
| `Copy`, `CopyAssign`, `CopyRing` | copy a parsed document and destroy a copy, both timed: a temporary copy, an assignment over an earlier copy, and replacing the oldest of eight live copies |
| `CopyOnly`, `DestroyOnly` | only the copy or only the destruction, the other half untimed; a fast destructor can leave work to the next allocations, so these tell the halves apart but do not compare versions |
| `Equal`, `Iterate` | compare a parsed document with a copy, 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, and destroy it again |
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`, ...).