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use unix timestamps in the CSVs used by gnuplot

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This is faster by factor 4, because we don't have to format the date.
This commit is contained in:
Andreas Huber
2017-09-24 09:38:08 +02:00
parent 955127dc4a
commit 37eb05aebf
2 changed files with 23 additions and 9 deletions
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2
pdb-plotting/src/main/java/org/lucares/recommind/logs/GnuplotSettings.java
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@@ -9,7 +9,7 @@ public class GnuplotSettings {
private String terminal = "png";
private int height = 1200;
private int width = 1600;
private String timefmt = "%Y-%m-%dT%H:%M:%S";
private String timefmt = "%s"; //"%Y-%m-%dT%H:%M:%S"; // TODO @ahr timefmt
// set format for x-axis
private String formatX = "%Y-%m-%d %H:%M:%S";

30
pdb-plotting/src/main/java/org/lucares/recommind/logs/Plotter.java
View File

@@ -15,9 +15,11 @@ import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.Formatter;
import java.util.Iterator;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import java.util.stream.Stream;
import org.lucares.pdb.api.Entry;
@@ -130,15 +132,15 @@ public class Plotter {
if (minDate.until(maxDate, ChronoUnit.WEEKS) > 1) {
formatX = "%Y-%m-%d";
rotateX = 0;
} else if (minDate.until(maxDate, ChronoUnit.SECONDS) > 10) {
} else if (minDate.until(maxDate, ChronoUnit.SECONDS) > 30) {
formatX = "%Y-%m-%d %H:%M:%S";
rotateX = gnuplotSettings.getRotateXAxisLabel();
} else {
formatX = "%Y-%m-%d %H:%M:%.3S";
rotateX = gnuplotSettings.getRotateXAxisLabel();
}
formattedMinDate = minDate.format(DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss"));
formattedMaxDate = maxDate.format(DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss"));
formattedMinDate = String.valueOf(minDate.toEpochSecond());
formattedMaxDate = String.valueOf(maxDate.toEpochSecond());
gnuplotSettings.setFormatX(formatX);
gnuplotSettings.setRotateXAxisLabel(rotateX);
@@ -216,21 +218,33 @@ public class Plotter {
int count = 0;
final long fromEpochMilli = dateFrom.toInstant().toEpochMilli();
final long toEpochMilli = dateTo.toInstant().toEpochMilli();
final boolean useMillis = (toEpochMilli - fromEpochMilli) < TimeUnit.MINUTES.toMillis(5);
long maxValue = 0;
long ignoredValues = 0;
final int separator = ',';
final int newline = '\n';
final DateTimeFormatter formatter = DateTimeFormatter.ISO_LOCAL_DATE_TIME;
try (final Writer output = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(dataFile), StandardCharsets.US_ASCII));) {
final StringBuilder formattedDateBuilder = new StringBuilder();
try (final Writer output = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(dataFile), StandardCharsets.US_ASCII));
final Formatter formatter = new Formatter(formattedDateBuilder);) {
final Iterator<Entry> it = entries.iterator();
while (it.hasNext()) {
final Entry entry = it.next();
if (fromEpochMilli <= entry.getEpochMilli() && entry.getEpochMilli() <= toEpochMilli) {
final OffsetDateTime date = entry.getDate();
final String value = String.valueOf(entry.getValue());
final String formattedDate = date.format(formatter);
final String formattedDate;
if (useMillis){
formattedDateBuilder.delete(0, formattedDateBuilder.length());
formatter.format("%.3f", entry.getEpochMilli() / 1000.0);
formattedDate = formattedDateBuilder.toString();
}else {
formattedDate = String.valueOf(entry.getEpochMilli() / 1000);
}
output.write(formattedDate);
output.write(separator);
output.write(value);
@@ -244,7 +258,7 @@ public class Plotter {
}
}
METRICS_LOGGER.debug("wrote {} values to csv in: {}ms (ignored {} values)", count, (System.nanoTime() - start) / 1_000_000.0, ignoredValues);
METRICS_LOGGER.debug("wrote {} values to csv in: {}ms (ignored {} values) use millis: {}", count, (System.nanoTime() - start) / 1_000_000.0, ignoredValues, Boolean.toString(useMillis));
return new CsvSummary(count, maxValue);
}
}