| feature | weaselab | fdb |
|---|---|---|
| based on | node-copying treap | node-copying treap |
branch-free child function |
✅ | ❌ |
| bytes per node (worst-case) | 64 + kv len + 1* | 96 + kv len |
| cheaper iteration* | ❌ | ✅ |
| efficient bulk queries | ✅ | ❌ |
| entries per set (worst-case) | 1 | 3 |
| memory-usage (rough) | 40% | 100% |
| 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
benchmarks
weaselab
| ns/op | op/s | err% | total | benchmark |
|---|---|---|---|---|
| 1,538.88 | 649,824.01 | 2.7% | 0.22 | monotonically increasing |
| 1.25 | 798,888,023.37 | 0.0% | 0.01 | *iter |
| 32.10 | 31,153,434.23 | 0.7% | 0.01 | ++iter |
| 31.08 | 32,178,831.30 | 0.3% | 0.01 | --iter |
| 139.19 | 7,184,433.93 | 2.2% | 0.02 | begin |
| 176.43 | 5,667,847.59 | 0.3% | 0.02 | begin (firstGeq) |
| 54.56 | 18,329,336.92 | 0.4% | 0.01 | end |
| 159.37 | 6,274,892.80 | 0.1% | 0.10 | bulkFirstGeq |
| 153.55 | 6,512,408.74 | 0.1% | 0.09 | bulkFirstGeq (latest version) |
fdb
| ns/op | op/s | err% | total | benchmark |
|---|---|---|---|---|
| 2,236.83 | 447,061.26 | 1.0% | 0.29 | monotonically increasing |
| 2.11 | 473,370,596.42 | 0.9% | 0.01 | *iter |
| 12.07 | 82,858,977.78 | 1.2% | 0.01 | ++iter |
| 8.54 | 117,158,071.80 | 0.9% | 0.01 | --iter |
| 94.26 | 10,608,588.66 | 1.1% | 0.01 | begin |
| 159.01 | 6,288,940.61 | 0.4% | 0.02 | begin (firstGeq) |
| 73.47 | 13,610,276.41 | 0.9% | 0.01 | end |
| 422.53 | 2,366,723.10 | 0.1% | 0.25 | bulkFirstGeq |
| 365.13 | 2,738,758.86 | 0.1% | 0.22 | bulkFirstGeq (latest version) |