slovdahl's submission (#691)
* slovdahl: First submission * More JAVA_OPTS flags, 0.1s better locally
This commit is contained in:
Sebastian Lövdahl
GitHub
parent
47046f327d
commit
a8823a1f93
22
calculate_average_slovdahl.sh
Executable file
22
calculate_average_slovdahl.sh
Executable file
@ -0,0 +1,22 @@
|
||||
#!/bin/sh
|
||||
#
|
||||
# Copyright 2023 The original authors
|
||||
#
|
||||
# Licensed under the Apache License, Version 2.0 (the "License");
|
||||
# you may not use this file except in compliance with the License.
|
||||
# You may obtain a copy of the License at
|
||||
#
|
||||
# http://www.apache.org/licenses/LICENSE-2.0
|
||||
#
|
||||
# Unless required by applicable law or agreed to in writing, software
|
||||
# distributed under the License is distributed on an "AS IS" BASIS,
|
||||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
# See the License for the specific language governing permissions and
|
||||
# limitations under the License.
|
||||
#
|
||||
|
||||
JAVA_OPTS="${JAVA_OPTS} --enable-preview -XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions"
|
||||
JAVA_OPTS="${JAVA_OPTS} -Xmx8g -Xms8g"
|
||||
JAVA_OPTS="${JAVA_OPTS} -XX:+TrustFinalNonStaticFields -XX:-UseCompressedOops"
|
||||
|
||||
java $JAVA_OPTS --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CalculateAverage_slovdahl
|
||||
22
prepare_slovdahl.sh
Executable file
22
prepare_slovdahl.sh
Executable file
@ -0,0 +1,22 @@
|
||||
#!/bin/bash
|
||||
#
|
||||
# Copyright 2023 The original authors
|
||||
#
|
||||
# Licensed under the Apache License, Version 2.0 (the "License");
|
||||
# you may not use this file except in compliance with the License.
|
||||
# You may obtain a copy of the License at
|
||||
#
|
||||
# http://www.apache.org/licenses/LICENSE-2.0
|
||||
#
|
||||
# Unless required by applicable law or agreed to in writing, software
|
||||
# distributed under the License is distributed on an "AS IS" BASIS,
|
||||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
# See the License for the specific language governing permissions and
|
||||
# limitations under the License.
|
||||
#
|
||||
|
||||
# Uncomment below to use sdk
|
||||
source "$HOME/.sdkman/bin/sdkman-init.sh"
|
||||
|
||||
sdk use java 21.0.2-tem 1>&2 > /dev/null
|
||||
./mvnw verify
|
||||
278
src/main/java/dev/morling/onebrc/CalculateAverage_slovdahl.java
Normal file
278
src/main/java/dev/morling/onebrc/CalculateAverage_slovdahl.java
Normal file
@ -0,0 +1,278 @@
|
||||
/*
|
||||
* Copyright 2023 The original authors
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
package dev.morling.onebrc;
|
||||
|
||||
import java.io.IOException;
|
||||
import java.lang.foreign.Arena;
|
||||
import java.lang.foreign.MemorySegment;
|
||||
import java.lang.foreign.ValueLayout;
|
||||
import java.nio.channels.FileChannel;
|
||||
import java.nio.file.Paths;
|
||||
import java.nio.file.StandardOpenOption;
|
||||
import java.util.ArrayList;
|
||||
import java.util.Arrays;
|
||||
import java.util.HashMap;
|
||||
import java.util.Map;
|
||||
import java.util.StringJoiner;
|
||||
import java.util.TreeMap;
|
||||
import java.util.concurrent.ExecutionException;
|
||||
import java.util.concurrent.ExecutorService;
|
||||
import java.util.concurrent.Executors;
|
||||
import java.util.concurrent.Future;
|
||||
|
||||
import static java.util.stream.Collectors.collectingAndThen;
|
||||
import static java.util.stream.Collectors.groupingBy;
|
||||
import static java.util.stream.Collectors.reducing;
|
||||
|
||||
public class CalculateAverage_slovdahl {
|
||||
|
||||
private static final String FILE = "./measurements.txt";
|
||||
|
||||
private static final int SLICE_SIZE = 1_048_576;
|
||||
|
||||
public static void main(String[] args) throws IOException, ExecutionException, InterruptedException {
|
||||
int segments = Runtime.getRuntime().availableProcessors() - 1;
|
||||
|
||||
try (Arena arena = Arena.ofShared();
|
||||
FileChannel channel = FileChannel.open(Paths.get(FILE), StandardOpenOption.READ);
|
||||
ExecutorService executor = Executors.newThreadPerTaskExecutor(Executors.defaultThreadFactory())) {
|
||||
|
||||
long size = channel.size();
|
||||
if (size < SLICE_SIZE) {
|
||||
segments = 1;
|
||||
}
|
||||
|
||||
long idealSegmentSize = size / segments;
|
||||
|
||||
MemorySegment mappedFile = channel.map(FileChannel.MapMode.READ_ONLY, 0, size, arena);
|
||||
var futures = new ArrayList<Future<Map<Station, MeasurementAggregator>>>(segments);
|
||||
|
||||
long segmentStart = 0;
|
||||
for (int i = 1; i <= segments; i++) {
|
||||
long actualSegmentOffset = idealSegmentSize * i;
|
||||
|
||||
while (actualSegmentOffset < size && mappedFile.get(ValueLayout.JAVA_BYTE, actualSegmentOffset) != (byte) '\n') {
|
||||
actualSegmentOffset++;
|
||||
}
|
||||
|
||||
long end = actualSegmentOffset - segmentStart;
|
||||
if (segmentStart + actualSegmentOffset - segmentStart + 1 < size) {
|
||||
end += 1;
|
||||
}
|
||||
|
||||
MemorySegment segment = mappedFile.asSlice(segmentStart, end);
|
||||
segmentStart = actualSegmentOffset + 1;
|
||||
|
||||
futures.add(executor.submit(() -> {
|
||||
byte[] array = new byte[SLICE_SIZE];
|
||||
MemorySegment bufferSegment = MemorySegment.ofArray(array);
|
||||
|
||||
long position = 0;
|
||||
long segmentSize = segment.byteSize();
|
||||
Map<Station, MeasurementAggregator> map = HashMap.newHashMap(10_000);
|
||||
|
||||
while (position < segmentSize) {
|
||||
long thisSliceSize = Math.min(SLICE_SIZE, segmentSize - position);
|
||||
|
||||
MemorySegment.copy(
|
||||
segment,
|
||||
ValueLayout.JAVA_BYTE,
|
||||
position,
|
||||
bufferSegment,
|
||||
ValueLayout.JAVA_BYTE,
|
||||
0,
|
||||
thisSliceSize);
|
||||
|
||||
if (thisSliceSize % 8 != 0) {
|
||||
bufferSegment
|
||||
.asSlice(thisSliceSize)
|
||||
.fill((byte) 0);
|
||||
}
|
||||
|
||||
int newlinePosition = 0;
|
||||
int startOffset = 0;
|
||||
while (true) {
|
||||
int semicolonPosition = nextOccurrence(array, (byte) ';', startOffset);
|
||||
if (semicolonPosition < 0) {
|
||||
break;
|
||||
}
|
||||
|
||||
int eolPosition = nextOccurrence(array, (byte) '\n', startOffset);
|
||||
if (eolPosition < 0) {
|
||||
if (semicolonPosition < segmentSize - 4) {
|
||||
break;
|
||||
}
|
||||
else {
|
||||
newlinePosition = (int) segmentSize;
|
||||
}
|
||||
}
|
||||
else {
|
||||
newlinePosition = eolPosition;
|
||||
}
|
||||
|
||||
byte[] nameArray = new byte[semicolonPosition - startOffset];
|
||||
System.arraycopy(array, startOffset, nameArray, 0, semicolonPosition - startOffset);
|
||||
Station station = new Station(nameArray);
|
||||
|
||||
int temperatureStart = semicolonPosition + 1;
|
||||
int temperatureLength = newlinePosition - semicolonPosition - 1;
|
||||
|
||||
int temperatureIntValue;
|
||||
if (array[temperatureStart] == '-') {
|
||||
if (temperatureLength == 4) {
|
||||
temperatureIntValue = -1 * ((array[temperatureStart + 1] - 48) * 10 +
|
||||
(array[temperatureStart + 3] - 48));
|
||||
}
|
||||
else {
|
||||
temperatureIntValue = -1 * ((array[temperatureStart + 1] - 48) * 100 +
|
||||
(array[temperatureStart + 2] - 48) * 10 +
|
||||
(array[temperatureStart + 4] - 48));
|
||||
}
|
||||
}
|
||||
else {
|
||||
if (temperatureLength == 3) {
|
||||
temperatureIntValue = (array[temperatureStart] - 48) * 10 +
|
||||
(array[temperatureStart + 2] - 48);
|
||||
}
|
||||
else {
|
||||
temperatureIntValue = (array[temperatureStart] - 48) * 100 +
|
||||
(array[temperatureStart + 1] - 48) * 10 +
|
||||
(array[temperatureStart + 3] - 48);
|
||||
}
|
||||
}
|
||||
|
||||
MeasurementAggregator agg = map.get(station);
|
||||
if (agg == null) {
|
||||
agg = new MeasurementAggregator();
|
||||
map.put(station, agg);
|
||||
}
|
||||
|
||||
agg.min = Math.min(agg.min, temperatureIntValue);
|
||||
agg.max = Math.max(agg.max, temperatureIntValue);
|
||||
agg.sum += temperatureIntValue;
|
||||
agg.count++;
|
||||
|
||||
// Make sure the next iteration won't find the same delimiters.
|
||||
array[semicolonPosition] = (byte) 0;
|
||||
array[newlinePosition] = (byte) 0;
|
||||
|
||||
startOffset = newlinePosition + 1;
|
||||
}
|
||||
|
||||
position += newlinePosition + 1;
|
||||
}
|
||||
|
||||
return map;
|
||||
}));
|
||||
}
|
||||
|
||||
TreeMap<String, ResultRow> result = futures.stream()
|
||||
.map(f -> {
|
||||
try {
|
||||
return f.get();
|
||||
}
|
||||
catch (InterruptedException | ExecutionException e) {
|
||||
throw new RuntimeException(e);
|
||||
}
|
||||
})
|
||||
.flatMap(m -> m.entrySet().stream())
|
||||
.collect(groupingBy(
|
||||
e -> new String(e.getKey().name()),
|
||||
TreeMap::new,
|
||||
collectingAndThen(
|
||||
reducing(
|
||||
new MeasurementAggregator(),
|
||||
Map.Entry::getValue,
|
||||
(agg1, agg2) -> {
|
||||
MeasurementAggregator res = new MeasurementAggregator();
|
||||
res.min = Math.min(agg1.min, agg2.min);
|
||||
res.max = Math.max(agg1.max, agg2.max);
|
||||
res.sum = agg1.sum + agg2.sum;
|
||||
res.count = agg1.count + agg2.count;
|
||||
|
||||
return res;
|
||||
}),
|
||||
agg -> new ResultRow(
|
||||
agg.min / 10.0,
|
||||
(Math.round((agg.sum / 10.0) * 10.0) / 10.0) / agg.count,
|
||||
agg.max / 10.0))));
|
||||
|
||||
System.out.println(result);
|
||||
|
||||
executor.shutdownNow();
|
||||
}
|
||||
}
|
||||
|
||||
private static int nextOccurrence(byte[] data, byte needle, int offset) {
|
||||
while (offset < data.length) {
|
||||
if (data[offset] == needle) {
|
||||
return offset;
|
||||
}
|
||||
offset++;
|
||||
}
|
||||
return -1;
|
||||
}
|
||||
|
||||
private record Station(byte[] name, int hash) {
|
||||
private Station(byte[] name) {
|
||||
this(name, Arrays.hashCode(name));
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean equals(Object o) {
|
||||
if (this == o) {
|
||||
return true;
|
||||
}
|
||||
if (o == null || getClass() != o.getClass()) {
|
||||
return false;
|
||||
}
|
||||
Station station = (Station) o;
|
||||
return Arrays.equals(name, station.name);
|
||||
}
|
||||
|
||||
@Override
|
||||
public int hashCode() {
|
||||
return hash;
|
||||
}
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
return new StringJoiner(", ", Station.class.getSimpleName() + "[", "]")
|
||||
.add("name=" + new String(name))
|
||||
.add("hash=" + hash)
|
||||
.toString();
|
||||
}
|
||||
}
|
||||
|
||||
private static class MeasurementAggregator {
|
||||
private int min = Integer.MAX_VALUE;
|
||||
private int max = Integer.MIN_VALUE;
|
||||
private long sum;
|
||||
private long count;
|
||||
}
|
||||
|
||||
private record ResultRow(double min, double mean, double max) {
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
return round(min) + "/" + round(mean) + "/" + round(max);
|
||||
}
|
||||
|
||||
private double round(double value) {
|
||||
return Math.round(value * 10.0) / 10.0;
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user