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8244936: Reduce JNI overhead of accessing FileDescriptor

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Reviewed-by: rriggs, alanb
This commit is contained in:
Claes Redestad 2020-05-13 22:25:14 +02:00
parent ad2afe0bf4
commit 168cdcf65d
8 changed files with 66 additions and 45 deletions
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22
test/micro/org/openjdk/bench/java/io/RandomAccessRead.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2014, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -51,11 +51,15 @@ public class RandomAccessRead {
@Param("1000000")
private int fileSize;
@Param("8192")
private int buffer;
private RandomAccessFile raf;
private long offset;
private int deltaIndex;
private int[] deltas;
private File f;
private byte[] buf;
@Setup(Level.Trial)
public void beforeRun() throws IOException {
@ -66,6 +70,7 @@ public class RandomAccessRead {
}
}
deltas = new int[]{1, 2, 3, 5, 7, 11, 13, 17, 19, 23};
buf = new byte[buffer];
}
@TearDown(Level.Trial)
@ -85,6 +90,20 @@ public class RandomAccessRead {
raf.close();
}
@Benchmark
public int testBuffer() throws IOException {
offset = offset + deltas[deltaIndex];
if (offset >= fileSize) {
offset = 0;
}
deltaIndex++;
if (deltaIndex >= deltas.length) {
deltaIndex = 0;
}
raf.seek(offset);
return raf.read(buf);
}
@Benchmark
public int test() throws IOException {
offset = offset + deltas[deltaIndex];
@ -98,5 +117,4 @@ public class RandomAccessRead {
raf.seek(offset);
return raf.read();
}
}