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plain old io (#492)

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plain old io
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Artsiom Korzun 2024-01-19 21:52:55 +01:00 committed by GitHub
parent 6e3893c6a6
commit 586def3620
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GPG Key ID: B5690EEEBB952194
2 changed files with 58 additions and 56 deletions
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4
calculate_average_artsiomkorzun.sh
View File

@ -17,9 +17,9 @@
if [ -f target/CalculateAverage_artsiomkorzun_image ]; then
echo "Picking up existing native image 'target/CalculateAverage_artsiomkorzun_image', delete the file to select JVM mode." 1>&2
target/CalculateAverage_artsiomkorzun_image
target/CalculateAverage_artsiomkorzun_image -XX:MaxDirectMemorySize=4294967296
else
JAVA_OPTS="--enable-preview -Xmx128m -XX:+UseSerialGC -XX:-TieredCompilation"
JAVA_OPTS="--enable-preview -Xmx128m -XX:+UseSerialGC -XX:-TieredCompilation -XX:MaxDirectMemorySize=4294967296"
echo "Chosing to run the app in JVM mode as no native image was found, use prepare_artsiomkorzun.sh to generate." 1>&2
java $JAVA_OPTS --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CalculateAverage_artsiomkorzun
fi

98
src/main/java/dev/morling/onebrc/CalculateAverage_artsiomkorzun.java
View File

@ -17,12 +17,12 @@ package dev.morling.onebrc;
import sun.misc.Unsafe;
import java.lang.foreign.Arena;
import java.lang.foreign.MemorySegment;
import java.lang.reflect.Field;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import java.util.Map;
import java.util.TreeMap;
import java.util.concurrent.atomic.AtomicInteger;
@ -31,19 +31,21 @@ import java.util.concurrent.atomic.AtomicReference;
public class CalculateAverage_artsiomkorzun {
private static final Path FILE = Path.of("./measurements.txt");
private static final long SEGMENT_SIZE = 32 * 1024 * 1024;
private static final long SEGMENT_OVERLAP = 1024;
private static final int SEGMENT_SIZE = 4 * 1024 * 1024;
private static final int SEGMENT_OVERLAP = 128;
private static final long COMMA_PATTERN = 0x3B3B3B3B3B3B3B3BL;
private static final long DOT_BITS = 0x10101000;
private static final long MAGIC_MULTIPLIER = (100 * 0x1000000 + 10 * 0x10000 + 1);
private static final Unsafe UNSAFE;
private static final long ADDRESS_OFFSET;
static {
try {
Field unsafe = Unsafe.class.getDeclaredField("theUnsafe");
unsafe.setAccessible(true);
UNSAFE = (Unsafe) unsafe.get(Unsafe.class);
ADDRESS_OFFSET = UNSAFE.objectFieldOffset(Buffer.class.getDeclaredField("address"));
}
catch (Throwable e) {
throw new RuntimeException(e);
@ -62,9 +64,7 @@ public class CalculateAverage_artsiomkorzun {
}
private static void execute() throws Exception {
MemorySegment fileMemory = map(FILE);
long fileAddress = fileMemory.address();
long fileSize = fileMemory.byteSize();
long fileSize = Files.size(FILE);
int segmentCount = (int) ((fileSize + SEGMENT_SIZE - 1) / SEGMENT_SIZE);
AtomicInteger counter = new AtomicInteger();
@ -74,7 +74,7 @@ public class CalculateAverage_artsiomkorzun {
Aggregator[] aggregators = new Aggregator[parallelism];
for (int i = 0; i < aggregators.length; i++) {
aggregators[i] = new Aggregator(counter, result, fileAddress, fileSize, segmentCount);
aggregators[i] = new Aggregator(counter, result, segmentCount);
aggregators[i].start();
}
@ -86,14 +86,16 @@ public class CalculateAverage_artsiomkorzun {
System.out.println(text(aggregates));
}
private static MemorySegment map(Path file) {
try (FileChannel channel = FileChannel.open(file, StandardOpenOption.READ)) {
long size = channel.size();
return channel.map(FileChannel.MapMode.READ_ONLY, 0, size, Arena.global());
}
catch (Throwable e) {
throw new RuntimeException(e);
private static long address(ByteBuffer buffer) {
return UNSAFE.getLong(buffer, ADDRESS_OFFSET);
}
private static ByteBuffer allocate(int size) {
ByteBuffer buffer = ByteBuffer.allocateDirect(size + 4096);
long address = address(buffer);
long aligned = (address + 4095) & (~4095);
int padding = (int) (aligned - address);
return buffer.position(padding).limit(padding + size).slice();
}
private static long word(long address) {
@ -139,13 +141,8 @@ public class CalculateAverage_artsiomkorzun {
private static final int ENTRIES = 64 * 1024;
private static final int SIZE = 128 * ENTRIES;
private final long pointer;
public Aggregates() {
long address = UNSAFE.allocateMemory(SIZE + 8096);
pointer = (address + 4095) & (~4095);
UNSAFE.setMemory(pointer, SIZE, (byte) 0);
}
private final ByteBuffer buffer = allocate(SIZE);
private final long pointer = address(buffer);
public long find(long word, int hash) {
long address = pointer + offset(hash);
@ -206,14 +203,8 @@ public class CalculateAverage_artsiomkorzun {
for (int offset = offset(hash);; offset = next(offset)) {
long address = pointer + offset;
int len = UNSAFE.getInt(address);
if (len == 0) {
UNSAFE.copyMemory(rightAddress, address, 24 + length);
break;
}
if (len == length && equal(address + 24, rightAddress + 24, length)) {
if (equal(address + 24, rightAddress + 24, length)) {
long sum = UNSAFE.getLong(address + 8) + UNSAFE.getLong(rightAddress + 8);
int cnt = UNSAFE.getInt(address + 16) + UNSAFE.getInt(rightAddress + 16);
short min = (short) Math.min(UNSAFE.getShort(address + 20), UNSAFE.getShort(rightAddress + 20));
@ -225,6 +216,13 @@ public class CalculateAverage_artsiomkorzun {
UNSAFE.putShort(address + 22, max);
break;
}
int len = UNSAFE.getInt(address);
if (len == 0) {
UNSAFE.copyMemory(rightAddress, address, length + 24);
break;
}
}
}
}
@ -237,8 +235,8 @@ public class CalculateAverage_artsiomkorzun {
int length = UNSAFE.getInt(address);
if (length != 0) {
byte[] array = new byte[length];
UNSAFE.copyMemory(null, address + 24, array, Unsafe.ARRAY_BYTE_BASE_OFFSET, length);
byte[] array = new byte[length - 1];
UNSAFE.copyMemory(null, address + 24, array, Unsafe.ARRAY_BYTE_BASE_OFFSET, array.length);
String key = new String(array);
long sum = UNSAFE.getLong(address + 8);
@ -271,7 +269,7 @@ public class CalculateAverage_artsiomkorzun {
}
private static boolean equal(long leftAddress, long leftWord, long rightAddress, int length) {
while (length >= 8) {
while (length > 8) {
long left = UNSAFE.getLong(leftAddress);
long right = UNSAFE.getLong(rightAddress);
@ -309,28 +307,28 @@ public class CalculateAverage_artsiomkorzun {
private final AtomicInteger counter;
private final AtomicReference<Aggregates> result;
private final long fileAddress;
private final long fileSize;
private final int segmentCount;
private final int segments;
public Aggregator(AtomicInteger counter, AtomicReference<Aggregates> result,
long fileAddress, long fileSize, int segmentCount) {
public Aggregator(AtomicInteger counter, AtomicReference<Aggregates> result, int segments) {
super("aggregator");
this.counter = counter;
this.result = result;
this.fileAddress = fileAddress;
this.fileSize = fileSize;
this.segmentCount = segmentCount;
this.segments = segments;
}
@Override
public void run() {
Aggregates aggregates = new Aggregates();
ByteBuffer buffer = allocate(SEGMENT_SIZE + SEGMENT_OVERLAP);
for (int segment; (segment = counter.getAndIncrement()) < segmentCount;) {
long position = SEGMENT_SIZE * segment;
long size = Math.min(SEGMENT_SIZE + SEGMENT_OVERLAP, fileSize - position);
long address = fileAddress + position;
try (FileChannel channel = FileChannel.open(FILE)) {
for (int segment; (segment = counter.getAndIncrement()) < segments;) {
buffer.clear();
long position = (long) SEGMENT_SIZE * segment;
int size = channel.read(buffer, position);
long address = address(buffer);
long limit = address + Math.min(SEGMENT_SIZE, size - 1);
if (segment > 0) {
@ -339,6 +337,10 @@ public class CalculateAverage_artsiomkorzun {
aggregate(aggregates, address, limit);
}
}
catch (Throwable e) {
throw new RuntimeException(e);
}
while (!result.compareAndSet(null, aggregates)) {
Aggregates rights = result.getAndSet(null);
@ -406,7 +408,7 @@ public class CalculateAverage_artsiomkorzun {
ptr = aggregates.put(position, word, length, hash);
}
position = update(ptr, position + length + 1);
position = update(ptr, position + length);
}
}
@ -431,12 +433,12 @@ public class CalculateAverage_artsiomkorzun {
}
private static long mask(long word, long separator) {
long mask = ((separator - 1) ^ separator) >>> 8;
long mask = separator ^ (separator - 1);
return word & mask;
}
private static int length(long separator) {
return Long.numberOfTrailingZeros(separator) >>> 3;
return (Long.numberOfTrailingZeros(separator) >>> 3) + 1;
}
private static long next(long position) {