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8295798: (ch) Test java/nio/channels/Channels/ReadXBytes.java is very slow on Windows

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Reviewed-by: alanb, bpb
This commit is contained in:
Daniel Jeliński 2022-10-25 07:25:07 +00:00
parent 89dafc002f
commit 706d1b7508
1 changed files with 23 additions and 18 deletions
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41
test/jdk/java/nio/channels/Channels/ReadXBytes.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2021, 2022, 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
@ -100,24 +100,29 @@ public class ReadXBytes {
// Creates a temporary file of a specified length with random content
static Path createFileWithRandomContent(long length) throws IOException {
Path file = createFile(length);
try (FileChannel fc = FileChannel.open(file, WRITE);) {
long pos = 0L;
// if the length exceeds 2 GB, skip the first 2 GB - 1 MB bytes
if (length >= 2L*1024*1024*1024) {
// write the last (length - 2GB - 1MB) bytes
pos = 2047L*1024*1024;
} else if (length > 0) {
// write either the first or last bytes only
long p = Math.min(Math.abs(RAND.nextLong()), length - 1);
pos = RAND.nextBoolean() ? p : length - 1 - p;
}
fc.position(pos);
int bufLength = Math.min(32768, (int)Math.min(length - pos, BIG_LENGTH));
byte[] buf = new byte[bufLength];
while (pos < length) {
try (FileChannel fc = FileChannel.open(file, WRITE)) {
if (length < 65536) {
// if the length is less than 64k, write the entire file
byte[] buf = new byte[(int)length];
RAND.nextBytes(buf);
int len = (int)Math.min(bufLength, length - pos);
pos += fc.write(ByteBuffer.wrap(buf, 0, len));
ByteBuffer bb = ByteBuffer.wrap(buf);
while (bb.hasRemaining()) {
fc.write(bb);
}
} else {
// write the first and the last 32k only
byte[] buf = new byte[32768];
RAND.nextBytes(buf);
ByteBuffer bb = ByteBuffer.wrap(buf);
while (bb.hasRemaining()) {
fc.write(bb);
}
bb.clear();
fc.position(length - buf.length);
RAND.nextBytes(buf);
while (bb.hasRemaining()) {
fc.write(bb);
}
}
}
return file;