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FastTime a faster alternative to System.currentTimeMillis

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FastTime is 100 times faster (according to my primitive
benchmark) than System.currentTimeMillis. It is less accurate.
This commit is contained in:
Andreas Huber
2021-07-30 19:45:44 +02:00
parent c6473e436b
commit 6d5cdbafca
2 changed files with 86 additions and 4 deletions
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9
performanceDb/src/main/java/org/lucares/performance/db/PerformanceDb.java
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@@ -31,6 +31,7 @@ import org.lucares.pdb.datastore.WriteException;
import org.lucares.pdb.datastore.internal.DataStore;
import org.lucares.pdb.datastore.internal.PartitionDiskStore;
import org.lucares.pdb.datastore.lang.SyntaxException;
import org.lucares.utils.FastTime;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@@ -94,7 +95,7 @@ public class PerformanceDb implements AutoCloseable {
long insertionsSinceLastSync = 0;
try {
long lastSync = System.currentTimeMillis();
long lastSync = FastTime.currentTimeMillis();
long nextSync = lastSync + timeBetweenSyncs.toMillis();
while (true) {
@@ -116,15 +117,15 @@ public class PerformanceDb implements AutoCloseable {
count++;
insertionsSinceLastSync++;
if (nextSync <= System.currentTimeMillis()) {
final long end = System.currentTimeMillis();
if (nextSync <= FastTime.currentTimeMillis()) {
final long end = FastTime.currentTimeMillis();
final long duration = end - lastSync;
final long entriesPerSecond = (long) (insertionsSinceLastSync / (duration / 1000.0));
METRICS_LOGGER.debug(String.format(Locale.US, "inserting %,11d/s ; total: %,d; last: %s",
entriesPerSecond, count, entry));
lastSync = System.currentTimeMillis();
lastSync = FastTime.currentTimeMillis();
nextSync = lastSync + timeBetweenSyncs.toMillis();
insertionsSinceLastSync = 0;
}