rmuir commented on code in PR #13223:
URL: https://github.com/apache/lucene/pull/13223#discussion_r1542723020
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lucene/core/src/java/org/apache/lucene/store/MMapDirectory.java:
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@@ -38,6 +38,15 @@
* fragmented address space. If you get an {@link IOException} about mapping
failed, it is
* recommended to reduce the chunk size, until it works.
*
+ * <p><b>NOTE</b>: On some platforms like Linux, mmap comes with a higher
readahead than regular
+ * read() operations, e.g. 128kB for mmap reads and 16kB for regular reads.
Such a high default
Review Comment:
Can you point to place in the kernel where this is happening?
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