Playground/1brc
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Fixed failing tests

Browse Source
This commit is contained in:
Roman Romanchuk 2024-01-11 18:24:41 +01:00 committed by Gunnar Morling
parent 6761d784a2
commit 6381aefcc1
2 changed files with 55 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
calculate_average_fatroom.sh
View File

@ -16,5 +16,5 @@
#
JAVA_OPTS="-Xnoclassgc -Xms16G -Xmx16G"
JAVA_OPTS="-server -Xnoclassgc -Xms16G -Xmx16G"
java $JAVA_OPTS --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CalculateAverage_fatroom

74
src/main/java/dev/morling/onebrc/CalculateAverage_fatroom.java
View File

@ -69,7 +69,7 @@ public class CalculateAverage_fatroom {
long fileSize = file.length();
long position = 0;
List<Callable<Map<String, MeasurementAggregator>>> tasks = new ArrayList<>();
List<Callable<Map<Station, MeasurementAggregator>>> tasks = new LinkedList<>();
while (position < fileSize) {
long end = Math.min(position + SEGMENT_LENGTH, fileSize);
int length = (int) (end - position);
@ -88,42 +88,48 @@ public class CalculateAverage_fatroom {
for (var future : executor.invokeAll(tasks)) {
var segmentAggregates = future.get();
for (var entry : segmentAggregates.entrySet()) {
aggregates.merge(entry.getKey(), entry.getValue(), MeasurementAggregator::combineWith);
aggregates.merge(entry.getKey().toString(), entry.getValue(), MeasurementAggregator::combineWith);
}
}
executor.shutdown();
executor.awaitTermination(Long.MAX_VALUE, TimeUnit.SECONDS);
// no sense to wait longer than base case
executor.awaitTermination(5, TimeUnit.MINUTES);
System.out.println(aggregates);
}
private static Map<String, MeasurementAggregator> processBuffer(MappedByteBuffer source, int length) {
Map<String, MeasurementAggregator> aggregates = new HashMap<>(500);
String station;
byte[] buffer = new byte[64];
private static Map<Station, MeasurementAggregator> processBuffer(MappedByteBuffer source, int length) {
Map<Station, MeasurementAggregator> aggregates = new HashMap<>(500);
Station station;
byte[] buffer = new byte[200];
byte[] measurement = new byte[5];
int measurementLength;
int idx = 0;
int hash = 1;
for (int i = 0; i < length; ++i) {
byte b = source.get(i);
hash = 31 * hash + b;
buffer[idx++] = b;
if (b == ';') {
station = new String(buffer, 0, idx - 1, StandardCharsets.UTF_8);
station = new Station(hash, buffer, idx - 1);
measurementLength = 3;
source.position(i + 1);
buffer[0] = source.get(++i);
buffer[1] = source.get(++i);
buffer[2] = source.get(++i);
buffer[3] = source.get(++i);
if (buffer[3] != '\n') {
measurement[0] = source.get(++i);
measurement[1] = source.get(++i);
measurement[2] = source.get(++i);
measurement[3] = source.get(++i);
if (measurement[3] != '\n') {
measurementLength++;
buffer[4] = source.get(++i);
if (buffer[4] != '\n') {
measurement[4] = source.get(++i);
if (measurement[4] != '\n') {
i++;
measurementLength++;
}
}
aggregates.computeIfAbsent(station, s -> new MeasurementAggregator()).consume(parseMeasurement(buffer, measurementLength));
aggregates.computeIfAbsent(station, s -> new MeasurementAggregator()).consume(parseMeasurement(measurement, measurementLength));
idx = 0;
hash = 1;
}
}
return aggregates;
@ -132,10 +138,38 @@ public class CalculateAverage_fatroom {
static double parseMeasurement(byte[] source, int size) {
int isNegativeSignPresent = ~(source[0] >> 4) & 1;
int firstDigit = source[isNegativeSignPresent] - '0';
int secondDigit = source[size - 3] - '0';
int thirdDigit = source[size - 1] - '0';
int secondDigit = source[size - 3];
int thirdDigit = source[size - 1];
int has4 = (size - isNegativeSignPresent) >> 2;
int value = has4 * firstDigit * 100 + secondDigit * 10 + thirdDigit;
int value = has4 * firstDigit * 100 + secondDigit * 10 + thirdDigit - 528;
return -isNegativeSignPresent ^ value - isNegativeSignPresent;
}
static class Station {
private byte[] bytes;
private int hash;
public Station(int hash, byte[] bytes, int length) {
this.bytes = new byte[length];
System.arraycopy(bytes, 0, this.bytes, 0, length);
this.hash = hash;
}
public String toString() {
return new String(bytes, 0, bytes.length, StandardCharsets.UTF_8);
}
@Override
public boolean equals(Object o) {
Station station = (Station) o;
if (hash != station.hash)
return false;
return Arrays.equals(bytes, station.bytes);
}
@Override
public int hashCode() {
return hash;
}
}
}