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/*
* Copyright (c) 2011. Peter Lawrey
*
* "THE BEER-WARE LICENSE" (Revision 128)
* As long as you retain this notice you can do whatever you want with this stuff.
* If we meet some day, and you think this stuff is worth it, you can buy me a beer in return
* There is no warranty.
*/

package com.google.code.java.core.parser;

import org.junit.Test;

import java.io.*;
import java.nio.ByteBuffer;
import java.util.Arrays;

import static junit.framework.Assert.assertEquals;

public class InMemoryPerfTest {
interface PerfTest {
LongReader longReader();

LongWriter longWriter();

void finish();

String toString();
}

public void doPerf(PerfTest perfTest) throws IOException, InterruptedException {
int runs = 1001;
long[] times = new long[runs];
long len = 128 * 1024;
for (int n = 0; n < runs; n++) {
Thread.sleep(1);
long start = System.nanoTime();

LongWriter lw = perfTest.longWriter();
lw.write(len);
for (long i = 0; i < len; i++) {
lw.write(i);
}
lw.close();

LongReader lr = perfTest.longReader();
long len2 = lr.read();
if (len != len2)
assertEquals(len, len2);

for (long i = 0; i < len; i++) {
lr.read();
}
lr.close();
times[n] = System.nanoTime() - start;
}
perfTest.finish();
Arrays.sort(times);
System.out.printf(perfTest + ": Typically took %.1f ns to write/read per long.%n", (double) times[runs / 2] / len);
}

@Test
public void testUnsafePerf() throws IOException, InterruptedException {
doPerf(new PerfTest() {
final long address = ParserUtils.UNSAFE.allocateMemory(1024 * 1024);

@Override
public LongWriter longWriter() {
return new UnsafeLongWriter(address);
}

@Override
public LongReader longReader() {
return new UnsafeLongReader(address);
}

@Override
public String toString() {
return "Unsafe binary";
}

@Override
public void finish() {
ParserUtils.UNSAFE.freeMemory(address);
}
});
}

@Test
public void testByteBufferPerf() throws IOException, InterruptedException {
doPerf(new PerfTest() {
ByteBuffer buffer = ByteBuffer.allocateDirect(1025 * 1024);

@Override
public LongWriter longWriter() {
buffer.clear();
return new ByteBufferLongWriter(buffer);
}

@Override
public LongReader longReader() {
buffer.flip();
return new ByteBufferLongReader(buffer);
}

@Override
public String toString() {
return "ByteBuffer binary";
}

@Override
public void finish() {
}
});
}

@Test
public void testByteBufferTextDirectPerf() throws IOException, InterruptedException {
doPerf(new PerfTest() {
ByteBuffer buffer = ByteBuffer.allocateDirect(1025 * 1024);

@Override
public LongWriter longWriter() {
buffer.clear();
return new ByteBufferTextLongWriter(buffer);
}

@Override
public LongReader longReader() {
buffer.flip();
return new ByteBufferTextLongReader(buffer);
}

@Override
public String toString() {
return "ByteBuffer direct text";
}

@Override
public void finish() {
}
});
}

@Test
public void testByteBufferTextPerf() throws IOException, InterruptedException {
doPerf(new PerfTest() {
ByteBuffer buffer = ByteBuffer.allocate(1025 * 1024);

@Override
public LongWriter longWriter() {
buffer.clear();
return new ByteBufferTextLongWriter(buffer);
}

@Override
public LongReader longReader() {
buffer.flip();
return new ByteBufferTextLongReader(buffer);
}

@Override
public String toString() {
return "ByteBuffer heap text";
}

@Override
public void finish() {
}
});
}

@Test
public void testUnsafeTextPerf() throws IOException, InterruptedException {
doPerf(new PerfTest() {
final long address = ParserUtils.UNSAFE.allocateMemory(1025 * 1024);

@Override
public LongWriter longWriter() {
return new UnsafeTextLongWriter(address);
}

@Override
public LongReader longReader() {
return new UnsafeTextLongReader(address);
}

@Override
public String toString() {
return "Unsafe text";
}

@Override
public void finish() {
ParserUtils.UNSAFE.freeMemory(address);
}
});
}

@Test
public void testDataPerf() throws IOException, InterruptedException {
doPerf(new PerfTest() {
ByteArrayOutputStream baos;

@Override
public LongWriter longWriter() {
baos = new ByteArrayOutputStream();
return new DataLongWriter(baos);
}

@Override
public LongReader longReader() {
ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
return new DataLongReader(bais);
}

@Override
public String toString() {
return "DataStream binary";
}

@Override
public void finish() {
}
});
}

@Test
public void testPrintPerf() throws IOException, InterruptedException {
doPerf(new PerfTest() {
ByteArrayOutputStream baos;

@Override
public LongWriter longWriter() {
baos = new ByteArrayOutputStream();
return new PrintLongWriter(new PrintWriter(new OutputStreamWriter(baos)));
}

@Override
public LongReader longReader() {
return new PrintLongReader(
new BufferedReader(
new InputStreamReader(
new ByteArrayInputStream(baos.toByteArray()))));
}

@Override
public String toString() {
return "Print text";
}

@Override
public void finish() {
}
});
}

@Test
public void testDecimalFormatPerf() throws IOException, InterruptedException {
doPerf(new PerfTest() {
ByteArrayOutputStream baos;

@Override
public LongWriter longWriter() {
baos = new ByteArrayOutputStream();
return new DecimalFormatLongWriter(new PrintWriter(new OutputStreamWriter(baos)));
}

@Override
public LongReader longReader() {
return new DecimalFormatLongReader(
new BufferedReader(
new InputStreamReader(
new ByteArrayInputStream(baos.toByteArray()))));
}

@Override
public String toString() {
return "DecimalFormat text";
}

@Override
public void finish() {
}
});
}
}

Change log

r58 by peter.lawrey on Aug 30, 2011   Diff
Beerware licensing.
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Older revisions

r20 by peter.lawrey on Jul 15, 2011   Diff
Add support for double reading
writing.
r15 by peter.lawrey on Jul 14, 2011   Diff
Add support for ByteBufferText parser
r14 by peter.lawrey on Jul 14, 2011   Diff
Add support for ByteBufferText parser
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