Back to the benchmarks! I got some great comments on reddit, So I wanted to do another post to update my numbers. Here’s what I changed:

• I wasn’t consistent on whether or not the serialization benchmarks included Some tests are including the allocation of a buffer to write into. I’ve changed it so most are reusing one, which speeds everything up (especially capnproto-rust!). This does depend on #18885 landing though.
• I’ve added bincode, which serializes values as raw bytes. Quite speedy too! Not nearly as fast as Cap’n Proto though.
• I’ve changed C++ and Rust JSON tests to serialize enums as uints.
• I added the time it takes to create the populate the structures. I’m betting the reason the Rust numbers are so high is that we’re allocating strings. Not sure if the other languages are able to avoid that allocation.

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JSON:

language	library	population (ns)	serialization (MB/s)	deserialization (MB/s)
Rust	serialize::json	1127	117	26
C++	rapidjson (dom)	546	281	144
C++	rapidjson (dom)	546	281	181
Go	encoding/json	343	63.99	22.46
Go	ffjson	343	144.60	(not supported)

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Cap’n Proto:

language	library	population (ns)	serialization (MB/s)	deserialization (MB/s)
Rust	capnproto-rust (unpacked)	325	4977	2251
Rust	capnproto-rust (packed)	325	398	246
Go	go-capnproto	2368	2226.71	450
Go	go-capnproto (zero copy)	2368	2226.71	1393.3

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Protocol Buffers:

language	library	population (ns)	serialization (MB/s)	deserialization (MB/s)
Rust	rust-protobuf	1041	370	118
Go	goprotobuf	1133	138.27	91.18
Go	gogoprotobuf	343	472.69	295.33

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Misc:

language	library	population (ns)	serialization (MB/s)	deserialization (MB/s)
Rust	rust-msgpack	1143	454	144
Rust	bincode	1143	1149	82

Anyone want to add more C/Go/Rust/Java/etc benchmarks?