Sorry, the attached image didn't go through. Here is a public google doc containing the image. https://docs.google.com/document/d/1thLMJIiJhbOBrL59R8JDY6iA_rpu7cgWZnrR0Z1xI5I/edit?tab=t.0
On Wed, Oct 30, 2024 at 1:41 PM Rui Wu <rui...@mongodb.com> wrote: > Dear users, > > We recently migrated from Lucene9.7 to Lucene9.11. During the migration, > we noticed that the Lucene9.11 has a longer warm up time for vector > queries. The warm up time means: when the index just finishes building, the > query time is high for the first few minutes. > > The following figure shows the issue. The T=0 means the index just > finishes building. The Madvise ON is vanilla Lucene9.11. The Madvise OFF is > Lucene9.11 run with this JVM flag (--enable-native-access=NON_EXISTING_MODULE) > which effectively disables the madvise change. Turning the Madvise off on > Lucene9.11 brings the warm up time back to what Lucene9.7 is (Lucene9.7 > does not have madvise). This reminds me of a possibly similar discussion in > https://github.com/apache/lucene/issues/13920. > > Thanks! > > [image: image.png] >
