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improve equality check performance, use graal jvm (#454)

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zerninv
2024-01-17 17:35:22 +00:00
committed by GitHub
parent 927880b97e
commit 765583e7d8
2 changed files with 86 additions and 63 deletions
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129
src/main/java/dev/morling/onebrc/CalculateAverage_zerninv.java
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@@ -31,39 +31,36 @@ import java.util.TreeMap;
public class CalculateAverage_zerninv {
private static final String FILE = "./measurements.txt";
private static final int L3_CACHE_SIZE = 128 * 1024 * 1024;
private static final int CORES = Runtime.getRuntime().availableProcessors();
private static final int CHUNK_SIZE = (L3_CACHE_SIZE - MeasurementContainer.SIZE * MeasurementContainer.ENTRY_SIZE * CORES) / CORES - 1024 * CORES;
// #.##
private static final int THREE_DIGITS_MASK = 0x2e0000;
// #.#
private static final int TWO_DIGITS_MASK = 0x2e00;
// #.#-
private static final int TWO_NEGATIVE_DIGITS_MASK = 0x2e002d;
private static final int BYTE_MASK = 0xff;
private static final int ZERO = '0';
private static final byte DELIMITER = ';';
private static final byte LINE_SEPARATOR = '\n';
private static final int CHUNK_SIZE = 1024 * 1024 * 32;
private static final Unsafe UNSAFE = initUnsafe();
private static Unsafe initUnsafe() {
try {
Field unsafe = Unsafe.class.getDeclaredField("theUnsafe");
unsafe.setAccessible(true);
return (Unsafe) unsafe.get(Unsafe.class);
}
catch (IllegalAccessException | NoSuchFieldException e) {
throw new RuntimeException(e);
}
}
public static void main(String[] args) throws IOException, InterruptedException {
try (var channel = FileChannel.open(Path.of(FILE), StandardOpenOption.READ)) {
var fileSize = channel.size();
var minChunkSize = Math.min(fileSize, CHUNK_SIZE);
var segment = channel.map(FileChannel.MapMode.READ_ONLY, 0, fileSize, Arena.global());
var tasks = new TaskThread[CORES];
for (int i = 0; i < tasks.length; i++) {
tasks[i] = new TaskThread(new MeasurementContainer(), (int) (fileSize / minChunkSize / CORES + 1));
}
var memorySegment = channel.map(FileChannel.MapMode.READ_ONLY, 0, fileSize, Arena.global());
var address = memorySegment.address();
var chunks = splitByChunks(address, address + fileSize, minChunkSize);
var chunks = splitByChunks(segment.address(), segment.address() + fileSize, minChunkSize);
for (int i = 0; i < chunks.size() - 1; i++) {
var task = tasks[i % CORES];
var task = tasks[i % tasks.length];
task.addChunk(chunks.get(i), chunks.get(i + 1));
}
@@ -93,23 +90,12 @@ public class CalculateAverage_zerninv {
}
}
private static Unsafe initUnsafe() {
try {
Field unsafe = Unsafe.class.getDeclaredField("theUnsafe");
unsafe.setAccessible(true);
return (Unsafe) unsafe.get(Unsafe.class);
}
catch (IllegalAccessException | NoSuchFieldException e) {
throw new RuntimeException(e);
}
}
private static List<Long> splitByChunks(long address, long end, long minChunkSize) {
List<Long> result = new ArrayList<>((int) ((end - address) / minChunkSize + 1));
result.add(address);
while (address < end) {
address += Math.min(end - address, minChunkSize);
while (address < end && UNSAFE.getByte(address++) != LINE_SEPARATOR) {
while (address < end && UNSAFE.getByte(address++) != '\n') {
}
result.add(address);
}
@@ -141,7 +127,7 @@ public class CalculateAverage_zerninv {
@Override
public String toString() {
return String.format("%.1f/%.1f/%.1f", min / 10d, sum / 10d / count, max / 10d);
return min / 10d + "/" + Math.round(sum / 1d / count) / 10d + "/" + max / 10d;
}
}
@@ -149,55 +135,59 @@ public class CalculateAverage_zerninv {
}
private static final class MeasurementContainer {
private static final int SIZE = 1024 * 16;
private static final int SIZE = 1 << 17;
private static final int ENTRY_SIZE = 4 + 4 + 1 + 8 + 8 + 2 + 2;
private static final int ENTRY_SIZE = 4 + 4 + 8 + 1 + 8 + 8 + 2 + 2;
private static final int COUNT_OFFSET = 0;
private static final int HASH_OFFSET = 4;
private static final int SIZE_OFFSET = 8;
private static final int ADDRESS_OFFSET = 9;
private static final int SUM_OFFSET = 17;
private static final int MIN_OFFSET = 25;
private static final int MAX_OFFSET = 27;
private static final int LAST_BYTES_OFFSET = 8;
private static final int SIZE_OFFSET = 16;
private static final int ADDRESS_OFFSET = 17;
private static final int SUM_OFFSET = 25;
private static final int MIN_OFFSET = 33;
private static final int MAX_OFFSET = 35;
private final long address;
private MeasurementContainer() {
address = UNSAFE.allocateMemory(ENTRY_SIZE * SIZE);
UNSAFE.setMemory(address, ENTRY_SIZE * SIZE, (byte) 0);
for (long ptr = address; ptr < address + SIZE * ENTRY_SIZE; ptr += ENTRY_SIZE) {
UNSAFE.putShort(ptr + MIN_OFFSET, Short.MAX_VALUE);
UNSAFE.putShort(ptr + MAX_OFFSET, Short.MIN_VALUE);
}
}
public void put(long address, byte size, int hash, short value) {
public void put(long address, byte size, int hash, long lastBytes, short value) {
int idx = Math.abs(hash % SIZE);
long ptr = this.address + idx * ENTRY_SIZE;
int count;
boolean fastEqual;
while ((count = UNSAFE.getInt(ptr + COUNT_OFFSET)) != 0) {
if (UNSAFE.getInt(ptr + HASH_OFFSET) == hash
&& UNSAFE.getByte(ptr + SIZE_OFFSET) == size
&& isEqual(UNSAFE.getLong(ptr + ADDRESS_OFFSET), address, size)) {
break;
fastEqual = UNSAFE.getInt(ptr + HASH_OFFSET) == hash && UNSAFE.getLong(ptr + LAST_BYTES_OFFSET) == lastBytes;
if (fastEqual && UNSAFE.getByte(ptr + SIZE_OFFSET) == size && isEqual(UNSAFE.getLong(ptr + ADDRESS_OFFSET), address, size - 8)) {
UNSAFE.putInt(ptr + COUNT_OFFSET, count + 1);
UNSAFE.putLong(ptr + ADDRESS_OFFSET, address);
UNSAFE.putLong(ptr + SUM_OFFSET, UNSAFE.getLong(ptr + SUM_OFFSET) + value);
if (value < UNSAFE.getShort(ptr + MIN_OFFSET)) {
UNSAFE.putShort(ptr + MIN_OFFSET, value);
}
if (value > UNSAFE.getShort(ptr + MAX_OFFSET)) {
UNSAFE.putShort(ptr + MAX_OFFSET, value);
}
return;
}
idx = (idx + 1) % SIZE;
ptr = this.address + idx * ENTRY_SIZE;
}
UNSAFE.putInt(ptr + COUNT_OFFSET, count + 1);
UNSAFE.putInt(ptr + COUNT_OFFSET, 1);
UNSAFE.putInt(ptr + HASH_OFFSET, hash);
UNSAFE.putLong(ptr + LAST_BYTES_OFFSET, lastBytes);
UNSAFE.putByte(ptr + SIZE_OFFSET, size);
UNSAFE.putLong(ptr + ADDRESS_OFFSET, address);
UNSAFE.putLong(ptr + SUM_OFFSET, UNSAFE.getLong(ptr + SUM_OFFSET) + value);
if (value < UNSAFE.getShort(ptr + MIN_OFFSET)) {
UNSAFE.putShort(ptr + MIN_OFFSET, value);
}
if (value > UNSAFE.getShort(ptr + MAX_OFFSET)) {
UNSAFE.putShort(ptr + MAX_OFFSET, value);
}
UNSAFE.putLong(ptr + SUM_OFFSET, value);
UNSAFE.putShort(ptr + MIN_OFFSET, value);
UNSAFE.putShort(ptr + MAX_OFFSET, value);
}
public List<Measurement> measurements() {
@@ -207,21 +197,21 @@ public class CalculateAverage_zerninv {
long ptr = this.address + i * ENTRY_SIZE;
count = UNSAFE.getInt(ptr + COUNT_OFFSET);
if (count != 0) {
var station = createString(UNSAFE.getLong(ptr + ADDRESS_OFFSET), UNSAFE.getByte(ptr + SIZE_OFFSET));
var measurements = new TemperatureAggregation(
UNSAFE.getLong(ptr + SUM_OFFSET),
count,
UNSAFE.getShort(ptr + MIN_OFFSET),
UNSAFE.getShort(ptr + MAX_OFFSET));
var key = createString(UNSAFE.getLong(ptr + ADDRESS_OFFSET), UNSAFE.getByte(ptr + SIZE_OFFSET));
result.add(new Measurement(key, measurements));
result.add(new Measurement(station, measurements));
}
}
return result;
}
private static boolean isEqual(long address, long address2, byte size) {
for (int i = 0; i < size; i++) {
if (UNSAFE.getByte(address + i) != UNSAFE.getByte(address2 + i)) {
private boolean isEqual(long address, long address2, int size) {
for (int i = 0; i < size; i += 8) {
if (UNSAFE.getLong(address + i) != UNSAFE.getLong(address2 + i)) {
return false;
}
}
@@ -238,6 +228,17 @@ public class CalculateAverage_zerninv {
}
private static class TaskThread extends Thread {
// #.##
private static final int THREE_DIGITS_MASK = 0x2e0000;
// #.#
private static final int TWO_DIGITS_MASK = 0x2e00;
// #.#-
private static final int TWO_NEGATIVE_DIGITS_MASK = 0x2e002d;
private static final int BYTE_MASK = 0xff;
private static final int ZERO = '0';
private static final byte DELIMITER = ';';
private final MeasurementContainer container;
private final List<Long> begins;
private final List<Long> ends;
@@ -265,15 +266,17 @@ public class CalculateAverage_zerninv {
}
private void calcForChunk(long offset, long end) {
long cityOffset;
long cityOffset, lastBytes;
int hashCode, temperature, word;
byte cityNameSize, b;
while (offset < end) {
cityOffset = offset;
lastBytes = 0;
hashCode = 0;
while ((b = UNSAFE.getByte(offset++)) != DELIMITER) {
hashCode = hashCode * 31 + b;
hashCode += hashCode * 31 + b;
lastBytes = (lastBytes << 8) | b;
}
cityNameSize = (byte) (offset - cityOffset - 1);
@@ -297,7 +300,7 @@ public class CalculateAverage_zerninv {
temperature = ZERO * 111 - ((word & BYTE_MASK) * 100 + ((word >>> 8) & BYTE_MASK) * 10 + ((word >>> 24) & BYTE_MASK));
}
offset++;
container.put(cityOffset, cityNameSize, hashCode, (short) temperature);
container.put(cityOffset, cityNameSize, hashCode, lastBytes, (short) temperature);
}
}
}