ChrisHegarty commented on issue #14315:
URL: https://github.com/apache/lucene/issues/14315#issuecomment-2690452885
```diff
---
a/lucene/test-framework/src/java/org/apache/lucene/tests/store/BaseDirectoryTestCase.java
+++
b/lucene/test-framework/src/java/org/apache/lucene/tests/store/BaseDirectoryTestCase.java
@@ -1131,11 +1131,16 @@ public abstract class BaseDirectoryTestCase extends
LuceneTestCase {
assertEquals(input.length(), slice.length());
assertBytes(slice, bytes, 0);
+ System.out.println("input= " + input);
// subslices
for (int offset = 1; offset < bytes.length; offset++) {
RandomAccessInput subslice = input.randomAccessSlice(offset,
input.length() - offset);
assertEquals(input.length() - offset, subslice.length());
+ long startTime = System.nanoTime();
assertBytes(subslice, bytes, offset);
+ double elapsed = (System.nanoTime() - startTime) / 100_000d;
+ System.out.println("subslice, offset=" + offset +
+ ", length=" +(input.length() - offset) + ", elapsed=" +
elapsed + "ms");
}
```
On my Mac:
```
2> Feb 28, 2025 11:49:57 AM
org.apache.lucene.internal.vectorization.VectorizationProvider lookup
2> WARNING: Vector bitsize and/or integer vectors enforcement; using
default vectorization provider outside of testMode
1> input=
DirectIOIndexInput(path="/Users/chegar/git/tmp/lucene/lucene/misc/build/tmp/tests-tmp/lucene.misc.store.TestDirectIODirectory_DEE483D0402DBE52-001/testBytes-001/bytes")
1> subslice, offset=1, length=2325, elapsed=83.61083ms
1> subslice, offset=2, length=2324, elapsed=45.48791ms
1> subslice, offset=3, length=2323, elapsed=45.84875ms
1> subslice, offset=4, length=2322, elapsed=49.80542ms
1> subslice, offset=5, length=2321, elapsed=50.92125ms
1> subslice, offset=6, length=2320, elapsed=54.70416ms
1> subslice, offset=7, length=2319, elapsed=55.43292ms
1> subslice, offset=8, length=2318, elapsed=52.85667ms
1> subslice, offset=9, length=2317, elapsed=74.40292ms
1> subslice, offset=10, length=2316, elapsed=40.83208ms
1> subslice, offset=11, length=2315, elapsed=40.60541ms
1> subslice, offset=12, length=2314, elapsed=41.45208ms
1> subslice, offset=13, length=2313, elapsed=40.88708ms
1> subslice, offset=14, length=2312, elapsed=40.6725ms
1> subslice, offset=15, length=2311, elapsed=40.485ms
1> subslice, offset=16, length=2310, elapsed=40.03917ms
1> subslice, offset=17, length=2309, elapsed=60.80458ms
1> subslice, offset=18, length=2308, elapsed=39.77875ms
1> subslice, offset=19, length=2307, elapsed=40.10625ms
1> subslice, offset=20, length=2306, elapsed=41.12375ms
1> subslice, offset=21, length=2305, elapsed=40.38333ms
1> subslice, offset=22, length=2304, elapsed=40.13167ms
1> subslice, offset=23, length=2303, elapsed=40.105ms
1> subslice, offset=24, length=2302, elapsed=39.715ms
1> subslice, offset=25, length=2301, elapsed=60.88458ms
1> subslice, offset=26, length=2300, elapsed=39.39959ms
1> subslice, offset=27, length=2299, elapsed=34.98834ms
...
1> subslice, offset=2311, length=15, elapsed=0.23917ms
1> subslice, offset=2312, length=14, elapsed=0.20834ms
1> subslice, offset=2313, length=13, elapsed=0.2ms
1> subslice, offset=2314, length=12, elapsed=0.20875ms
1> subslice, offset=2315, length=11, elapsed=0.18416ms
1> subslice, offset=2316, length=10, elapsed=0.14417ms
1> subslice, offset=2317, length=9, elapsed=0.13417ms
1> subslice, offset=2318, length=8, elapsed=0.13ms
1> subslice, offset=2319, length=7, elapsed=0.125ms
1> subslice, offset=2320, length=6, elapsed=0.09875ms
1> subslice, offset=2321, length=5, elapsed=0.07375ms
1> subslice, offset=2322, length=4, elapsed=0.06792ms
1> subslice, offset=2323, length=3, elapsed=0.04209ms
1> subslice, offset=2324, length=2, elapsed=0.03791ms
1> subslice, offset=2325, length=1, elapsed=0.01084ms
```
On my Linux box:
```
input=
DirectIOIndexInput(path="/home/ubuntu/git/lucene/lucene/misc/build/tmp/tests-tmp/lucene.misc.store.TestDirectIODirectory_DEE483D0402DBE52-005/testBytes-001/bytes")
subslice, offset=1, length=2325, elapsed=28201.41166ms
subslice, offset=2, length=2324, elapsed=28089.54572ms
subslice, offset=3, length=2323, elapsed=28115.48957ms
subslice, offset=4, length=2322, elapsed=28078.17193ms
subslice, offset=5, length=2321, elapsed=27974.84056ms
subslice, offset=6, length=2320, elapsed=28047.90044ms
subslice, offset=7, length=2319, elapsed=27952.86185ms
subslice, offset=8, length=2318, elapsed=27881.8789ms
subslice, offset=9, length=2317, elapsed=28011.43265ms
subslice, offset=10, length=2316, elapsed=27976.61504ms
subslice, offset=11, length=2315, elapsed=27988.20013ms
subslice, offset=12, length=2314, elapsed=27917.88236ms
subslice, offset=13, length=2313, elapsed=27722.13725ms
subslice, offset=14, length=2312, elapsed=27861.3312ms
subslice, offset=15, length=2311, elapsed=27939.80588ms
subslice, offset=16, length=2310, elapsed=27954.75357ms
subslice, offset=17, length=2309, elapsed=27942.04881ms
...
```
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