mayya-sharipova commented on issue #11507:
URL: https://github.com/apache/lucene/issues/11507#issuecomment-1629661053
@rmuir
> Can we run this test with lucene's defaults (e.g. not a 2GB rambuffer)?
I've done the test and surprising indexing time decreased substantially. It
is almost 2 times faster to index with Lucene's defaults than with 2Gb
RamBuffer at the expense that we end up with a bigger number of segments.
- Lucene 9.7 branch with FloatVectorValues.MAX_DIMENSIONS set to 2048
- preferredBitSize=128
- Panama Vector API enabled
- vector dims: 1536
- num of docs: 2.68M
| RamBuffer Size | Indexing time | Num of segments |
|----------: |-------------:|------:|
| 16 Mb | 1877 s | 19|
| 1994 Mb | 3141s | 9 |
<details>
<summary>Details</summary>
```
WARNING: Using incubator modules: jdk.incubator.vector
Jul 10, 2023 3:35:25 P.M.
org.apache.lucene.store.MemorySegmentIndexInputProvider <init>
INFO: Using MemorySegmentIndexInput with Java 20; to disable start with
-Dorg.apache.lucene.store.MMapDirectory.enableMemorySegments=false
Jul 10, 2023 3:35:26 P.M. org.apache.lucene.util.VectorUtilPanamaProvider
<init>
INFO: Java vector incubator API enabled; uses preferredBitSize=128
_fc.fdt _v6.fnm
_vj.si _vr_Lucene95HnswVectorsFormat_0.vec
_fc.fdx _v6.si
_vj_Lucene95HnswVectorsFormat_0.vec _vr_Lucene95HnswVectorsFormat_0.vem
_fc.fnm _v6_Lucene95HnswVectorsFormat_0.vec
_vj_Lucene95HnswVectorsFormat_0.vem _vr_Lucene95HnswVectorsFormat_0.vex
_fc.si _v6_Lucene95HnswVectorsFormat_0.vem
_vj_Lucene95HnswVectorsFormat_0.vex _vs.fdm
_fc_Lucene95HnswVectorsFormat_0.vec _v6_Lucene95HnswVectorsFormat_0.vex
_vl.fdm _vs.fdt
creating index in vectors.bin-16-100.index
MS 0 [2023-07-10T14:47:25.668178Z; main]: initDynamicDefaults
maxThreadCount=4 maxMergeCount=9
IFD 0 [2023-07-10T14:47:25.725823Z; main]: init: current segments file is
"segments";
deletionPolicy=org.apache.lucene.index.KeepOnlyLastCommitDeletionPolicy@64f6106c
IFD 0 [2023-07-10T14:47:25.735809Z; main]: now delete 0 files: []
IFD 0 [2023-07-10T14:47:25.738456Z; main]: now checkpoint "" [0 segments ;
isCommit = false]
IFD 0 [2023-07-10T14:47:25.738587Z; main]: now delete 0 files: []
IFD 0 [2023-07-10T14:47:25.743719Z; main]: 2 ms to checkpoint
IW 0 [2023-07-10T14:47:25.744195Z; main]: init: create=true reader=null
IW 0 [2023-07-10T14:47:25.779752Z; main]:
dir=MMapDirectory@/Users/mayya/Elastic/knn/open_ai_vectors/vectors.bin-16-100.index
lockFactory=org.apache.lucene.store.NativeFSLockFactory@319b92f3
index=
version=9.7.0
analyzer=org.apache.lucene.analysis.standard.StandardAnalyzer
ramBufferSizeMB=16.0
maxBufferedDocs=-1
mergedSegmentWarmer=null
delPolicy=org.apache.lucene.index.KeepOnlyLastCommitDeletionPolicy
commit=null
openMode=CREATE
similarity=org.apache.lucene.search.similarities.BM25Similarity
mergeScheduler=ConcurrentMergeScheduler: maxThreadCount=4, maxMergeCount=9,
ioThrottle=true
codec=Lucene95
infoStream=org.apache.lucene.util.PrintStreamInfoStream
mergePolicy=[TieredMergePolicy: maxMergeAtOnce=10,
maxMergedSegmentMB=5120.0, floorSegmentMB=2.0,
forceMergeDeletesPctAllowed=10.0, segmentsPerTier=10.0,
maxCFSSegmentSizeMB=8.796093022208E12, noCFSRatio=0.1, deletesPctAllowed=20.0
readerPooling=true
perThreadHardLimitMB=1945
useCompoundFile=false
commitOnClose=true
indexSort=null
checkPendingFlushOnUpdate=true
softDeletesField=null
maxFullFlushMergeWaitMillis=500
leafSorter=null
eventListener=org.apache.lucene.index.IndexWriterEventListener$1@10a035a0
writer=org.apache.lucene.index.IndexWriter@67b467e9
IW 0 [2023-07-10T14:47:25.780320Z; main]: MMapDirectory.UNMAP_SUPPORTED=true
FP 0 [2023-07-10T14:47:27.042597Z; main]: trigger flush:
activeBytes=16779458 deleteBytes=0 vs ramBufferMB=16.0
FP 0 [2023-07-10T14:47:27.045564Z; main]: thread state has 16779458 bytes;
docInRAM=2589
FP 0 [2023-07-10T14:47:27.049109Z; main]: 1 in-use non-flushing threads
states
DWPT 0 [2023-07-10T14:47:27.050859Z; main]: flush postings as segment _0
numDocs=2589
....
Indexed 2680961 documents in 1877s
```
</details>
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