All benchmarks were run on a Intel 7th gen cpu @4.0GHz with 32KB of L1 cache, and compiled with clang 10 with -O3.
source
Iterate N entities and unpack M components
Number of Entities
1 Component
2 Components
4 Components
256
0.002 ms
0.004 ms
0.008 ms
512
0.004 ms
0.008 ms
0.016 ms
4k
0.034 ms
0.063 ms
0.127 ms
32k
0.265 ms
0.507 ms
1.02 ms
250k
2.16 ms
4.14 ms
8.24 ms
1M
9.24 ms
18.0 ms
35.6 ms
for (auto entity : world->view<Components...>()) {
auto &a = world->unpack <A>(entity);
// ...Iterate N entities and unpack M components (lambda version)
Number of Entities
1 Component
2 Components
256
0.002 ms
0.005 ms
512
0.005 ms
0.009 ms
4k
0.038 ms
0.073 ms
32k
0.307 ms
0.592 ms
250k
2.45 ms
4.70 ms
1M
9.83 ms
18.7 ms
world->each<A, B>([](A &a, B &b) {
// ... Create N entities and pack 1 component
Number of Entities
Time
256
0.022 ms
512
0.043 ms
4k
0.345 ms
32k
2.80 ms
for (int64_t i = 0 ; i < N; ++i) {
world->pack (world->make_entity (), A{});
}Emit 2 events to N listeners
Number of Listeners
Time
256
0.004 ms
512
0.008 ms
4k
0.068 ms
32k
0.590 ms
250k
4.35 ms
1M
17.3 ms