[GitHub] [lucene] gsmiller commented on issue #12317: Option for disabling term dictionary compression

["gsmiller (via GitHub)" <gi...@apache.org>]

gsmiller commented on issue #12317:
URL: https://github.com/apache/lucene/issues/12317#issuecomment-1556202535

   I'm no expert in this area of our codec, but I'm curious to understand the issue a bit better. From the flame chart you provide, it looks like you're primarily looking at an indexing-related performance issue. Is that correct? When you disabled the patch, did you notice query-time performance changes? Compression isn't only useful for saving disk space; it's useful for keeping index pages hot in the OS cache and getting better data locality, which translates to better query-time performance. If your customer is running a 16gb heap on a machine with 32gb of memory, I wonder if they're benefitting much from the page cache? Is the heap squeezing out available memory for the page cache?


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