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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/tmiasko/dbus-core

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 Marshal + Send benchmark is not performed for zvariant because the zbus library currently uses a lot of println!() which hamper performance unfairly. The dbus-message-parser does not provide any means of sending messages.

Current results

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

To replicate these results just run: cargo bench. That will run all benchmarks. Alternatively you can rerun the benchmarks with more samples to get more reliable results. I used these parameters on the AMD CPU: target/release/deps/marshal_bench-221b1ccb00ad3f0a --nresamples 1000 --sample-size 1000 --bench.

Library MarshalMixed MarshalStrArray MarshalBigArray Marshal + Send
rustbus 11.405 us 179.49 us 5.2076 us 185.19 us
dbus-rs 165.86 us 1382.0 us 265.19 us 462.27 us
dbus-native 6.3081 us 398.83 us 222.01 us 149.27 us
dbus-bytestream 17.413 us 1356.0 us 153.00 us 182.65 us
dbus-core 9.3962 us 314.25 us 3.6330 us NaN
dbus-message-parser 49.605 us 7845.0 us 1213.3 us NaN
dbus-pure 18.164 us 362.68 us 52.927 us 225.27 us
zvariant 29.552 us 1285.3 us 308.78 us NaN
zvariant-derive 30.668 us 1295.5 us 316.89 us NaN