5d912a2f35
# Objective * Speed up inserting and applying commands. * Halve the stack size of `CommandQueue` to 24 bytes. * Require fewer allocations. ## Solution Store commands and metadata densely within the same buffer. Each command takes up 1 `usize` of metadata, plus the bytes to store the command itself. Zero-sized types take up no space except for the metadata. # Benchmarks All of the benchmarks related to commands. | Bench | Time | % Change | p-value | |----------------------------------------|-----------|--------------|-----------------| | empty_commands/0_entities | 4.7780 ns | -18.381% | 0.00 | | spawn_commands/2000_entities | 233.11 us | -0.9961% | 0.00 | | spawn_commands/4000_entities | 448.38 us | -3.1466% | 0.00 | | spawn_commands/6000_entities | 693.12 us | -0.3978% | _0.52_ | | spawn_commands/8000_entities | 889.48 us | -2.8802% | 0.00 | | insert_commands/insert | 609.95 us | -4.8604% | 0.00 | | insert_commands/insert_batch | 355.54 us | -2.8165% | 0.00 | | fake_commands/2000_commands | 4.8018 us | **-17.802%** | 0.00 | | fake_commands/4000_commands | 9.5969 us | **-17.337%** | 0.00 | | fake_commands/6000_commands | 14.421 us | **-18.454%** | 0.00 | | fake_commands/8000_commands | 19.192 us | **-18.261%** | 0.00 | | sized_commands_0_bytes/2000_commands | 4.0593 us | -4.7145% | 0.00 | | sized_commands_0_bytes/4000_commands | 8.1541 us | -4.9470% | 0.00 | | sized_commands_0_bytes/6000_commands | 12.806 us | -12.017% | 0.00 | | sized_commands_0_bytes/8000_commands | 17.096 us | -14.070% | 0.00 | | sized_commands_12_bytes/2000_commands | 5.3425 us | **-27.632%** | 0.00 | | sized_commands_12_bytes/4000_commands | 10.283 us | **-31.158%** | 0.00 | | sized_commands_12_bytes/6000_commands | 15.339 us | **-31.418%** | 0.00 | | sized_commands_12_bytes/8000_commands | 20.206 us | **-33.133%** | 0.00 | | sized_commands_512_bytes/2000_commands | 99.118 us | -9.9655% | 0.00 | | sized_commands_512_bytes/4000_commands | 201.96 us | -8.8235% | 0.00 | | sized_commands_512_bytes/6000_commands | 300.95 us | -9.2344% | 0.00 | | sized_commands_512_bytes/8000_commands | 404.69 us | -8.4578% | 0.00 | |
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| .. | ||
| entity | ||
| query | ||
| schedule | ||
| schedule_v3 | ||
| storage | ||
| system | ||
| world | ||
| archetype.rs | ||
| bundle.rs | ||
| change_detection.rs | ||
| component.rs | ||
| event.rs | ||
| lib.rs | ||
| reflect.rs | ||