| feature | weaselab | fdb |
|---|---|---|
| based on | node-copying treap | node-copying treap |
| bytes per node (worst-case) | 64 + kv len + 1* | 96 + kv len |
| cheaper iteration* | ❌ | ✅ |
| efficient bulk queries | ✅ | ❌ |
| entries per set (worst-case) | 1 | 3 |
| node gc | mark-and-sweep | reference-counting |
| pointer-size | 32-bit | 64-bit |
| purge strategy | scan | search |
| read from foreign thread | ✅ | ❌ |
| recursion-free | ✅ | ❌ |
| returns node memory to OS | ✅ | ❌ |
| searches per point clear | 1 | 5 |
| searches per range clear | 2 | 5 |
| searches per set (worst-case) | 1 | 4 |
* Part of a set of tradeoffs that enable 1 entry per set worst-case