jimczi commented on PR #14178:
URL: https://github.com/apache/lucene/pull/14178#issuecomment-2622455427

   > Almost 10x indexing throughput improvement tells me we are doing something 
silly in Lucene.
   
   I did not test this specific integration but Faiss is multithreaded on bulk 
training, adding and searching so we have to be careful when comparing the 
result.
   The benchmark results show a single segment but only Faiss reports time 
spent in the force merge. 
   Does that mean that you indexed with `-numIndexThreads=1` for the Lucene 
run? Since Faiss uses multithreading by default, we cannot compare with Lucene 
if we don't use multi thread indexing and merging. 
    


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