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