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/*
* 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
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8274548
* @summary Test gathering write of more than INT_MAX bytes
* @requires vm.bits == 64
* @library ..
* @library /test/lib
* @build jdk.test.lib.RandomFactory
* @run main/othervm/timeout=480 -Xmx4G LargeGatheringWrite
* @key randomness
*/
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;
import java.util.Random;
import jdk.test.lib.RandomFactory;
import static java.nio.file.StandardOpenOption.CREATE;
import static java.nio.file.StandardOpenOption.READ;
import static java.nio.file.StandardOpenOption.WRITE;
public class LargeGatheringWrite {
private static final int GB = 1024*1024*1024;
private static final Random RND = RandomFactory.getRandom();
private static long t0;
private static void printTime(String msg) {
System.out.printf("TIMESTAMP: %-16s: %f seconds%n", msg,
(System.nanoTime() - t0)/1000000000.0);
}
public static void main(String[] args) throws IOException {
t0 = System.nanoTime();
printTime("start");
// Create direct and heap buffers
ByteBuffer direct = ByteBuffer.allocateDirect(GB);
ByteBuffer heap = ByteBuffer.allocate(GB);
// Load buffers with random values
assert heap.hasArray();
RND.nextBytes(heap.array());
direct.put(0, heap, 0, heap.capacity());
// Create an array of buffers derived from direct and heap
ByteBuffer[] bigBuffers = new ByteBuffer[] {
direct,
heap,
direct.slice(0, GB/2),
heap.slice(0, GB/2),
direct.slice(GB/2, GB/2),
heap.slice(GB/2, GB/2),
direct.slice(GB/4, GB/2),
heap.slice(GB/4, GB/2),
direct.slice(0, 1),
heap.slice(GB - 2, 1)
};
// Calculate the sum of all buffer capacities
long totalLength = 0L;
for(ByteBuffer buf : bigBuffers)
totalLength += buf.capacity();
// Write the data to a temporary file
Path tempFile = Files.createTempFile("LargeGatheringWrite", ".dat");
printTime("before writing");
System.out.printf("Writing %d bytes of data...%n", totalLength);
try (FileChannel fcw = FileChannel.open(tempFile, CREATE, WRITE);) {
// Print size of individual writes and total number written
long bytesWritten = 0;
long n;
while ((n = fcw.write(bigBuffers)) > 0) {
System.out.printf("Wrote %d bytes\n", n);
bytesWritten += n;
}
System.out.printf("Total of %d bytes written\n", bytesWritten);
printTime("after writing");
// Verify the content written
try (FileChannel fcr = FileChannel.open(tempFile, READ);) {
byte[] bytes = null;
for (ByteBuffer buf : bigBuffers) {
printTime("before verifying");
// For each buffer read the corresponding number of bytes
buf.rewind();
int length = buf.remaining();
System.out.printf("Checking length %d%n", length);
if (bytes == null || bytes.length < length)
bytes = new byte[length];
ByteBuffer dst = ByteBuffer.wrap(bytes).slice(0, length);
if (dst.remaining() != length)
throw new RuntimeException("remaining");
if (fcr.read(dst) != length)
throw new RuntimeException("length");
dst.rewind();
// Verify that the bytes read from the file match the buffer
int mismatch;
if ((mismatch = dst.mismatch(buf)) != -1) {
String msg = String.format("mismatch: %d%n", mismatch);
throw new RuntimeException(msg);
}
printTime("after verifying");
}
}
} finally {
Files.delete(tempFile);
}
printTime("end");
}
}
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