What is this

This repo tries to give an overview over the landscape of the the different dbus implementations that exists in the rust ecosystem.

1. https://github.com/KillingSpark/rustbus
2. https://github.com/diwic/dbus-rs/ (bindings to C library)
3. https://github.com/diwic/dbus-rs/tree/master/dbus-native
4. https://gitlab.freedesktop.org/zeenix/zbus/
5. https://github.com/Arnavion/dbus-pure
6. https://github.com/srwalter/dbus-bytestream
7. https://github.com/LinkTed/dbus-message-parser
8. https://github.com/cmaves/async-rustbus

Note that I am the author of rustbus, but of course I am trying to be as objective as possible here.

Current state

Some benchmarks exist. I plan to add equivalent ones for the missing libs, and more kinds of benchmarks.

The benchmarks

1. MarshalMix: Build a signal message with mixed params and marshal it
2. MarshalBigArray: Build a signal message with a big u64 array and marshal it
3. MarshalStrArray: Build a signal message with a big String array and marshal it
4. Marshal + Send: Connect to the sessionbus, build a signal and send it to the bus

The dbus-message-parser does not provide any means of sending messages, so this benchmark is omitted.

Current results

I am running this on a Ryzen 3800X (/proc/cpuinfo says: AMD Ryzen 7 3800X). Your values might vary a bit.

I used rustc 1.65.0 (897e37553 2022-11-02) to run these benchmarks.

To replicate these results just run: cargo bench. That will run all benchmarks.

Library	MarshalMixed	MarshalStrArray	MarshalBigArray	Marshal + Send
rustbus	3.4257 µs	94.031 µs	2.1689 µs	71.926 µs
dbus-rs	168.82 µs	1.3286 ms	377.54 µs	262.12 µs
dbus-native	5.1487 µs	551.10 µs	123.87 µs	49.769 µs
dbus-bytestream	14.002 µs	1.1528 ms	134.56 µs	64.110 µs
dbus-message-parser	35.968 µs	4.6027 ms	756.30 µs	NaN
dbus-pure	14.657 µs	263.60 µs	19.066 µs	53.806 µs
zvariant	54.555 µs	1.0492 ms	538.07 µs	246.59 µs
zvariant-derive	55.633 µs	1.0560 ms	545.26 µs	245.16 µs
rustbus-async	4.5583 µs	145.70 µs	2.2329 µs	116.30 µs