mayya-sharipova edited a comment on pull request #728:
URL: https://github.com/apache/lucene/pull/728#issuecomment-1058148842
I've benchmarked the results with ann-benchmarks on glove-100-angular (M:16,
efConstruction:100)
- baseline: main branch where we unset RAMBufferSizeMB, which defaults to
**16Mb** with force merge at the end of indexing.
- candidate: this PR, where RAMBufferSizeMB is set to default **16Mb** with
force merge at the end of indexing.
**Results**
- Indexing baseline took 1099 secs, around **18mins**
- Indexing candidate took 586 secs, around **10 mins**
- search performance is the same.
<details>
<summary>Details on the search performance </summary>
| | baseline recall | baseline QPS | candidate recall |
candidate QPS |
| ----------- | --------------: | -----------: | ---------------: |
------------: |
| n_cands=10 | 0.486 | 3995.468 | 0.463 |
3636.417 |
| n_cands=20 | 0.532 | 3261.435 | 0.529 |
3356.358 |
| n_cands=40 | 0.608 | 2685.442 | 0.603 |
2494.603 |
| n_cands=80 | 0.683 | 1874.002 | 0.682 |
1884.534 |
| n_cands=120 | 0.723 | 1474.137 | 0.721 |
1445.883 |
| n_cands=200 | 0.766 | 1048.531 | 0.766 |
1070.614 |
| n_cands=400 | 0.819 | 554.110 | 0.819 |
639.026 |
| n_cands=600 | 0.844 | 464.523 | 0.845 |
435.123 |
| n_cands=800 | 0.861 | 355.228 | 0.862 |
329.773 |
</details>
<details>
<summary>Candidate indexing details </summary>
Indexing output
```txt
IW 0 [2022-03-03T14:30:49.413950Z; main]: init: create=true reader=null
ramBufferSizeMB=16.0
maxBufferedDocs=-1
IW 0 [2022-03-03T14:30:49.424202Z; main]: MMapDirectory.UNMAP_SUPPORTED=true
Done indexing 1183514 documents; now flush
IW 0 [2022-03-03T14:30:50.824200Z; main]: now flush at close
IW 0 [2022-03-03T14:30:50.824401Z; main]: start flush: applyAllDeletes=true
IW 0 [2022-03-03T14:30:50.824515Z; main]: index before flush
DW 0 [2022-03-03T14:30:50.824557Z; main]: startFullFlush
DW 0 [2022-03-03T14:30:50.827209Z; main]: anyChanges? numDocsInRam=1183514
deletes=false hasTickets:false pendingChangesInFullFlush: false
DWPT 0 [2022-03-03T14:30:50.831053Z; main]: flush postings as segment _0
numDocs=1183514
HNSW 0 [2022-03-03T14:30:52.334343Z; main]: build graph from 1183514 vectors
...
HNSW 0 [2022-03-03T14:40:31.049504Z; main]: built 1180000 in 5585/578724 ms
...
IW 0 [2022-03-03T14:40:33.492318Z; main]: 582671 msec to write vectors
IFD 0 [2022-03-03T14:40:34.655718Z; main]: 20 msec to checkpoint
Indexed 1183514 documents in 585s
Force merge index in luceneknn-100-16-100.train-16-100.index
IFD 1 [2022-03-03T14:40:34.671943Z; main]: 0 msec to checkpoint
Built index in 586.944657087326
```
**Files in the index**
```txt
0 -rw-r--r-- 1 mayyasharipova staff 0B 3 Mar 14:30 _0.fdm
10080 -rw-r--r-- 1 mayyasharipova staff 4.6M 3 Mar 14:30 _0.fdt
0 -rw-r--r-- 1 mayyasharipova staff 0B 3 Mar 14:30
_0_Lucene90FieldsIndex-doc_ids_0.tmp
0 -rw-r--r-- 1 mayyasharipova staff 0B 3 Mar 14:30
_0_Lucene90FieldsIndexfile_pointers_1.tmp
929304 -rw-r--r-- 1 mayyasharipova staff 451M 3 Mar 14:30
_0_Lucene91HnswVectorsFormat_0.vec
924624 -rw-r--r-- 1 mayyasharipova staff 451M 3 Mar 14:30
_0_Lucene91HnswVectorsFormat_0.vec_temp_3.tmp
0 -rw-r--r-- 1 mayyasharipova staff 0B 3 Mar 14:30
_0_Lucene91HnswVectorsFormat_0.vem
0 -rw-r--r-- 1 mayyasharipova staff 0B 3 Mar 14:30
_0_Lucene91HnswVectorsFormat_0.vex
953168 -rw-r--r-- 1 mayyasharipova staff 451M 3 Mar 14:30
_0_knn_buffered_vectors_temp_2.tmp
0 -rw-r--r-- 1 mayyasharipova staff 0B 3 Mar 14:30 write.lock
```
**Files after force merge**
```txt
8 -rw-r--r-- 1 mayyasharipova staff 297B 3 Mar 14:40 _0.cfe
1105112 -rw-r--r-- 1 mayyasharipova staff 538M 3 Mar 14:40 _0.cfs
8 -rw-r--r-- 1 mayyasharipova staff 376B 3 Mar 14:40 _0.si
8 -rw-r--r-- 1 mayyasharipova staff 154B 3 Mar 14:40 segments_1
0 -rw-r--r-- 1 mayyasharipova staff 0B 3 Mar 14:30 write.lock
```
</details>
<details>
<summary>Baseline indexing details</summary>
Indexing output
```txt
Built index in 1099.0846738815308
```
**Files after force merge**
```txt
drwxr-xr-x 12 mayyasharipova staff 384B 3 Mar 15:14 .
drwxr-xr-x 42 mayyasharipova staff 1.3K 3 Mar 15:14 ..
-rw-r--r-- 1 mayyasharipova staff 201B 3 Mar 15:03 _w.fdm
-rw-r--r-- 1 mayyasharipova staff 4.6M 3 Mar 15:03 _w.fdt
-rw-r--r-- 1 mayyasharipova staff 3.5K 3 Mar 15:03 _w.fdx
-rw-r--r-- 1 mayyasharipova staff 192B 3 Mar 15:14 _w.fnm
-rw-r--r-- 1 mayyasharipova staff 532B 3 Mar 15:14 _w.si
-rw-r--r-- 1 mayyasharipova staff 451M 3 Mar 15:14
_w_Lucene91HnswVectorsFormat_0.vec
-rw-r--r-- 1 mayyasharipova staff 309K 3 Mar 15:14
_w_Lucene91HnswVectorsFormat_0.vem
-rw-r--r-- 1 mayyasharipova staff 82M 3 Mar 15:14
_w_Lucene91HnswVectorsFormat_0.vex
-rw-r--r-- 1 mayyasharipova staff 154B 3 Mar 15:14 segments_2
-rw-r--r-- 1 mayyasharipova staff 0B 3 Mar 14:56 write.lock
```
</details>
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