uschindler commented on code in PR #13196:
URL: https://github.com/apache/lucene/pull/13196#discussion_r1535283242
##########
lucene/core/src/java21/org/apache/lucene/store/MemorySegmentIndexInputProvider.java:
##########
@@ -92,10 +110,22 @@ private final MemorySegment[] map(
}
if (preload) {
segment.load();
+ } else if (segSize > 0L && advice.isPresent()) { // not when preloading!
+ nativeAccess.madvise(segment, advice.getAsInt());
}
segments[segNr] = segment;
startOffset += segSize;
}
return segments;
}
+
+ private OptionalInt mapContextToMadvise(IOContext context) {
+ if (context.randomAccess) {
+ return OptionalInt.of(NativeAccess.POSIX_MADV_RANDOM);
+ }
+ if (context.readOnce || context.context == Context.MERGE) {
Review Comment:
I moved the check for MERGE context to beginning in
242e5e9064acb70430c9082b82b2258ce75beeb3. This makes it always win. The reason
for that is: We often set MERGE context, but the other settings keep their
defaults (like random access). So when merging is first, we always bail out and
advise kernel: "may be freed soon after they are accessed"
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