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@@ -14,6 +14,7 @@ Install: | |
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``` | ||
pip install mkdocs-material | ||
pip install mkdocs-redirects | ||
``` | ||
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Build and Serve: | ||
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C++ Benchmarks {#flatbuffers_benchmarks} | ||
========== | ||
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Comparing against other serialization solutions, running on Windows 7 | ||
64bit. We use the LITE runtime for Protocol Buffers (less code / lower | ||
overhead), Rapid JSON (one of the fastest C++ JSON parsers around), | ||
and pugixml, also one of the fastest XML parsers. | ||
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We also compare against code that doesn't use a serialization library | ||
at all (the column "Raw structs"), which is what you get if you write | ||
hardcoded code that just writes structs. This is the fastest possible, | ||
but of course is not cross platform nor has any kind of forwards / | ||
backwards compatibility. | ||
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We compare against Flatbuffers with the binary wire format (as | ||
intended), and also with JSON as the wire format with the optional JSON | ||
parser (which, using a schema, parses JSON into a binary buffer that can | ||
then be accessed as before). | ||
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The benchmark object is a set of about 10 objects containing an array, 4 | ||
strings, and a large variety of int/float scalar values of all sizes, | ||
meant to be representative of game data, e.g. a scene format. | ||
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| | FlatBuffers (binary) | Protocol Buffers LITE | Rapid JSON | FlatBuffers (JSON) | pugixml | Raw structs | | ||
|--------------------------------------------------------|-----------------------|-----------------------|-----------------------|------------------------| ----------------------| ----------------------| | ||
| Decode + Traverse + Dealloc (1 million times, seconds) | 0.08 | 302 | 583 | 105 | 196 | 0.02 | | ||
| Decode / Traverse / Dealloc (breakdown) | 0 / 0.08 / 0 | 220 / 0.15 / 81 | 294 / 0.9 / 287 | 70 / 0.08 / 35 | 41 / 3.9 / 150 | 0 / 0.02 / 0 | | ||
| Encode (1 million times, seconds) | 3.2 | 185 | 650 | 169 | 273 | 0.15 | | ||
| Wire format size (normal / zlib, bytes) | 344 / 220 | 228 / 174 | 1475 / 322 | 1029 / 298 | 1137 / 341 | 312 / 187 | | ||
| Memory needed to store decoded wire (bytes / blocks) | 0 / 0 | 760 / 20 | 65689 / 4 | 328 / 1 | 34194 / 3 | 0 / 0 | | ||
| Transient memory allocated during decode (KB) | 0 | 1 | 131 | 4 | 34 | 0 | | ||
| Generated source code size (KB) | 4 | 61 | 0 | 4 | 0 | 0 | | ||
| Field access in handwritten traversal code | typed accessors | typed accessors | manual error checking | typed accessors | manual error checking | typed but no safety | | ||
| Library source code (KB) | 15 | some subset of 3800 | 87 | 43 | 327 | 0 | | ||
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### Some other serialization systems we compared against but did not benchmark (yet), in rough order of applicability: | ||
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- Cap'n'Proto promises to reduce Protocol Buffers much like FlatBuffers does, | ||
though with a more complicated binary encoding and less flexibility (no | ||
optional fields to allow deprecating fields or serializing with missing | ||
fields for which defaults exist). | ||
It currently also isn't fully cross-platform portable (lack of VS support). | ||
- msgpack: has very minimal forwards/backwards compatibility support when used | ||
with the typed C++ interface. Also lacks VS2010 support. | ||
- Thrift: very similar to Protocol Buffers, but appears to be less efficient, | ||
and have more dependencies. | ||
- YAML: a superset of JSON and otherwise very similar. Used by e.g. Unity. | ||
- C# comes with built-in serialization functionality, as used by Unity also. | ||
Being tied to the language, and having no automatic versioning support | ||
limits its applicability. | ||
- Project Anarchy (the free mobile engine by Havok) comes with a serialization | ||
system, that however does no automatic versioning (have to code around new | ||
fields manually), is very much tied to the rest of the engine, and works | ||
without a schema to generate code (tied to your C++ class definition). | ||
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### Code for benchmarks | ||
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Code for these benchmarks sits in `benchmarks/` in git branch `benchmarks`. | ||
It sits in its own branch because it has submodule dependencies that the main | ||
project doesn't need, and the code standards do not meet those of the main | ||
project. Please read `benchmarks/cpp/README.txt` before working with the code. | ||
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<br> |
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