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This commit is contained in:
Filip Hrisafov 2024-01-03 20:15:07 +01:00 committed by Gunnar Morling
parent fd92f5e807
commit a503362c36
4 changed files with 66 additions and 59 deletions
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24
src/main/java/dev/morling/onebrc/CalculateAverage_ebarlas.java
View File

@ -51,7 +51,8 @@ public class CalculateAverage_ebarlas {
try {
var buffer = channel.map(FileChannel.MapMode.READ_ONLY, pStart, pSize);
partitions[pIdx] = processBuffer(buffer, pIdx == 0);
} catch (IOException e) {
}
catch (IOException e) {
throw new RuntimeException(e);
}
};
@ -94,7 +95,8 @@ public class CalculateAverage_ebarlas {
var t = target[j];
if (t == null) {
target[j] = current[j]; // copy ref from current to target
} else {
}
else {
t.min = Math.min(t.min, current[j].min);
t.max = Math.max(t.max, current[j].max);
t.sum += current[j].sum;
@ -154,10 +156,12 @@ public class CalculateAverage_ebarlas {
st = stats[idx] = new Stats(key);
}
readingKey = false;
} else {
}
else {
keyHash = HASH_FACTOR * keyHash + b;
}
} else {
}
else {
if (b == '\n') {
var v = negative ? -val : val;
st.min = Math.min(st.min, v);
@ -169,9 +173,11 @@ public class CalculateAverage_ebarlas {
val = 0;
negative = false;
keyStart = buffer.position();
} else if (b == '-') {
}
else if (b == '-') {
negative = true;
} else if (b != '.') { // skip '.' since fractional tenth unit after decimal point is assumed
}
else if (b != '.') { // skip '.' since fractional tenth unit after decimal point is assumed
val = val * 10 + (b - '0');
}
}
@ -187,13 +193,15 @@ public class CalculateAverage_ebarlas {
}
private static byte[] readHeader(ByteBuffer buffer) { // read up to and including first newline (or end-of-input)
while (buffer.hasRemaining() && buffer.get() != '\n') ;
while (buffer.hasRemaining() && buffer.get() != '\n')
;
var header = new byte[buffer.position()];
buffer.get(0, header, 0, header.length);
return header;
}
record Partition(byte[] header, byte[] footer, Stats[] stats) {}
record Partition(byte[] header, byte[] footer, Stats[] stats) {
}
private static class Stats { // min, max, and sum values are modeled with integral types that represent tenths of a unit
final byte[] key;

1
src/main/java/dev/morling/onebrc/CalculateAverage_seijikun.java
View File

@ -26,7 +26,6 @@ public class CalculateAverage_seijikun {
private static final String FILE = "./measurements.txt";
private static class MeasurementAggregator {
private double min = Double.POSITIVE_INFINITY;
private double max = Double.NEGATIVE_INFINITY;

12
src/main/java/dev/morling/onebrc/CalculateAverage_truelive.java
View File

@ -106,8 +106,7 @@ public class CalculateAverage_truelive {
private static Map<String, Measurement> combineMaps(
final Map<String, Measurement> map1,
final Map<String, Measurement> map2
) {
final Map<String, Measurement> map2) {
for (final var entry : map2.entrySet()) {
map1.merge(entry.getKey(), entry.getValue(), Measurement::combineWith);
}
@ -136,8 +135,7 @@ public class CalculateAverage_truelive {
final MappedByteBuffer mbb = in.map(
FileChannel.MapMode.READ_ONLY,
start,
Math.min(CHUNK_SIZE, total - start)
);
Math.min(CHUNK_SIZE, total - start));
int realEnd = mbb.limit() - 1;
while (mbb.get(realEnd) != '\n') {
realEnd--;
@ -148,7 +146,8 @@ public class CalculateAverage_truelive {
start += realEnd;
return mbb;
} catch (final IOException e) {
}
catch (final IOException e) {
throw new RuntimeException(e);
}
}
@ -189,7 +188,8 @@ public class CalculateAverage_truelive {
name = new String(arr, 0, len);
bug.position(pos);
bug.mark();
} else if (c == '\n') {
}
else if (c == '\n') {
final int pos = bug.position();
bug.reset();
final int len = pos - bug.position();