rmuir commented on code in PR #13450:
URL: https://github.com/apache/lucene/pull/13450#discussion_r1626828513
##########
lucene/core/src/java21/org/apache/lucene/store/MemorySegmentIndexInput.java:
##########
@@ -370,6 +370,16 @@ public void prefetch(long offset, long length) throws
IOException {
}
}
+ @Override
+ public void readAhead(long offset, long length) throws IOException {
+ // Start loading the first bytes in the background
+ if (length != 0) {
+ prefetch(offset, 1);
+ }
+ // TODO: Is there a hint we can give to the OS to let it optimize for our
forward-only access
+ // pattern in the given range?
+ }
Review Comment:
or even better, `MADV_NORMAL` for the range, which is less aggressive.
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