README.md

Benchmarks

This folder contains benchmarks for zentt as well as the following ECS libraries:

• EnTT
• Bevy

The goal is to compare the performance in similar scenarios, although because of API and implementation differences each ECS has some unique benchmarks aswell.

Results

Each benchmark was run 10 times, creating/modifying/iterating 1'000'000 entities, the world/registry containing the entities was only cleared between each run (no new world/registry), so subsequent runs were faster because memory for components and entities was already allocated in the world.

Numbers in each cell: average, fastest, slowest, all units are in nano second unless specified explicitly.

Benchmark		zentt	Bevy	EnTT
Create empty entity	Avg Min Max	11 8 26	30 25 58	3.85 3.58 4.23
Create entity, add component (8 bytes)	Avg Min Max	52 48 68	111 101 141	22 20 36
Create entity, add 5 components (72 bytes)	Avg Min Max	371 332 458	548 521 608	136 105 155
Create entity bundle with 5 components (72 bytes)	Avg Min Max	101 87 158	206 165 244	-
Create entity, add 8 components (192 bytes)	Avg Min Max	722 687 847	1067 1037 1196	224 189 318
Create entity bundle with 8 components (192 bytes)	Avg Min Max	172 134 318	280 264 401	-
Create entity, add five empty components	Avg Min Max
Create entity bundle with five empty components	Avg Min Max
Add component (40 bytes) to entity with 5 components (72 bytes)	Avg Min Max	140 119 226	252 241 326	23 20 45
Add one component (192 bytes) to entity	Avg Min Max
Iterate entities with one component	Avg Min Max	2.18 1.84 2.87	2.31 1.92 3.76	1.79 1.54 2.79
Iterate entities with eight components, use three	Avg Min Max	8.22 7.04 9.76	11.50 9.56 13.14	10.94 10.11 11.91
Iterate entities with eight components, use all	Avg Min Max	8.37 7.14 9.84	12.58 10.25 15.84	22.21 18.92 32.57
Iterate entities with five components, different combinations, use 2	Avg Min Max	2.54 1.97 3.13	2.23 1.87 3.85	View, Group 3.28, 1.96 2.92, 1.41 3.76, 2.97
Iterate entities with five components, more different combinations, use 2 A & B	Avg Min Max	2.21 2.91 4.08	3.66 3.04 4.83	4.02 3.28 4.92
Iterate entities with five components, more different combinations, use 2 A & C	Avg Min Max	4.56 3.84 6.16	4.42 3.91 6.06	8.85 7.90 10.48
Record create entity commands	Avg Min Max	22 15 86	-	-
Apply create entity commands	Avg Min Max	12 10 18	-	-
Record create entity commands and add 8 components (192 bytes)	Avg Min Max	299 201 1018	-	-
Apply create entity commands and add 8 components (192 bytes)	Avg Min Max	784 722 909	-	-
Record create entity bundle commands with 8 components (192 bytes)	Avg Min Max	100 79 234	-	-
Apply create entity bundle commands withand add 8 components (192 bytes)	Avg Min Max	263 231 383	-	-
	Avg Min Max

Raw Results

This contains the raw output from the benchmark programs.