Performance

Silverback tries to improve the performance with every release and a huge effort is put into optimizing the code and the integration with the underlying libraries. The development of v5.0.0 especially focused on performance improvements in several areas and the results speak for themselves. There surely is still room for further optimizations, but the current state is already quite satisfying.

Benchmark Results

The benchmarks were built with .NET 10 and run on a Windows 11 workstation (AMD Ryzen 9 9950X3D, 64 GB DDR5). They use BenchmarkDotNet, and the source code is available on GitHub.

Message Bus

v4.6.2

Method	Mean	Error	StdDev	Gen0	Gen1	Allocated
Publish with single sync subscriber	1.726 us	0.0296 us	0.0247 us	0.2136	0.2060	10.5 KB
Publish with single async subscriber	2.572 us	0.0230 us	0.0204 us	0.2365	0.2289	11.42 KB
Publish with multiple sync subscribers	1.868 us	0.0156 us	0.0138 us	0.2213	0.2136	10.75 KB
Publish with multiple async subscribers	4.317 us	0.0463 us	0.0410 us	0.2747	0.2594	13.45 KB
Publish with multiple sync and async subscribers	2.750 us	0.0494 us	0.0588 us	0.2441	0.2365	11.73 KB
PublishAsync with single sync subscriber	1.664 us	0.0119 us	0.0093 us	0.2136	0.2060	10.31 KB
PublishAsync with single async subscriber	2.508 us	0.0312 us	0.0276 us	0.2365	0.2289	11.05 KB
PublishAsync with multiple sync subscribers	1.851 us	0.0145 us	0.0300 us	0.2136	0.1984	10.66 KB
PublishAsync with multiple async subscribers	4.406 us	0.0880 us	0.1736 us	0.2441	0.1831	12.51 KB
PublishAsync with multiple sync and async subscribers	2.799 us	0.0532 us	0.0497 us	0.2441	0.2289	11.36 KB

v5.0.0

Method	Mean	Error	StdDev	Gen0	Allocated
Publish with single sync subscriber	195.5 ns	2.55 ns	2.13 ns	0.0219	1.08 KB
Publish with single async subscriber	843.5 ns	15.90 ns	14.87 ns	0.0305	1.54 KB
Publish with multiple sync subscribers	198.3 ns	1.63 ns	1.44 ns	0.0219	1.08 KB
Publish with multiple async subscribers	853.3 ns	3.77 ns	2.94 ns	0.0305	1.54 KB
Publish with multiple sync and async subscribers	1,037.7 ns	12.75 ns	11.30 ns	0.0381	2 KB
PublishAsync with single sync subscriber	205.0 ns	1.09 ns	0.97 ns	0.0219	1.08 KB
PublishAsync with single async subscriber	1,025.1 ns	20.23 ns	21.64 ns	0.0458	2.24 KB
PublishAsync with multiple sync subscribers	204.4 ns	1.83 ns	1.71 ns	0.0219	1.08 KB
PublishAsync with multiple async subscribers	1,027.4 ns	15.70 ns	15.42 ns	0.0458	2.24 KB
PublishAsync with multiple sync and async subscribers	1,370.5 ns	11.19 ns	9.92 ns	0.0610	3.09 KB

Comparison v5.0.0 vs. v4.6.2

Method	Mean 4.6.2	Mean 5.0.0	Mean Diff	Allocated 4.6.2	Allocated 5.0.0	Allocated Diff
Publish with single sync subscriber	1.726 us	0.196 us	-89 %	10.50 KB	1.08 KB	-90 %
Publish with single async subscriber	2.572 us	0.844 us	-67 %	11.42 KB	1.54 KB	-87 %
Publish with multiple sync subscribers	1.868 us	0.198 us	-89 %	10.75 KB	1.08 KB	-90 %
Publish with multiple async subscribers	4.317 us	0.853 us	-80 %	13.45 KB	1.54 KB	-89 %
Publish with multiple sync and async subscribers	2.750 us	1.038 us	-62 %	11.73 KB	2.00 KB	-83 %
PublishAsync with single sync subscriber	1.664 us	0.205 us	-88 %	10.31 KB	1.08 KB	-90 %
PublishAsync with single async subscriber	2.508 us	1.025 us	-59 %	11.05 KB	2.24 KB	-80 %
PublishAsync with multiple sync subscribers	1.851 us	0.204 us	-89 %	10.66 KB	1.08 KB	-90 %
PublishAsync with multiple async subscribers	4.406 us	1.027 us	-77 %	12.51 KB	2.24 KB	-82 %
PublishAsync with multiple sync and async subscribers	2.799 us	1.371 us	-51 %	11.36 KB	3.09 KB	-73 %

Kafka Producer

Publishing 1000 messages to Kafka (running in docker on the local machine) to a single topic using a single producer.

v4.6.2

ethod	Mean	Error	StdDev	Ratio	Allocated
PublishAsync inside foreach	15.68 s	0.025 s	0.024 s	1.00	20.17 MB

v5.0.0

Method	Mean	Error	StdDev	Ratio	Gen0	Gen1	Allocated	Alloc Ratio
PublishAsync inside foreach	15,603.73 ms	15.956 ms	12.457 ms	1.000	-	-	6.31 MB	1.00
WrapAndPublishBatchAsync	15.59 ms	0.139 ms	0.123 ms	0.001	62.5000	31.2500	3.43 MB	0.54

Comparison v5.0.0 vs. v4.6.2

Method	Mean 4.6.2	Mean 5.0.0	Mean Diff	Allocated 4.6.2	Allocated 5.0.0	Allocated Diff
PublishAsync inside foreach	15.68 s	15.60 s	-	20.17 MB	6.31 MB	-69 %
WrapAndPublishBatchAsync	*15.68 s	0.02 s	-99.9 %	20.17 MB	3.43 MB	-83 %

* WrapAndPublishBatchAsync did not exist in v4.6.2 so it's compared against PublishAsync inside a foreach, being it the only straightforward possibility in v4.6.2.