nellemann/jmemperf
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Second try on reading data from memory.

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This commit is contained in:
Mark Nellemann 2023-06-29 09:41:28 +02:00
parent a7f0bc4822
commit 8c530c3477
2 changed files with 9 additions and 13 deletions
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8
src/main/java/biz/nellemann/memstress/Application.java
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@ -3,8 +3,6 @@ package biz.nellemann.memstress;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import picocli.CommandLine;
import java.util.Scanner;
import java.util.concurrent.Callable;
@CommandLine.Command(name = "memstress", mixinStandardHelpOptions = true, versionProvider = VersionProvider.class, description = "Memory performance measurement tool.")
@ -29,12 +27,6 @@ public class Application implements Callable<Integer> {
MyDatabase database = new MyDatabase(maxTables, maxRowsPerTable, maxDataPerRow);
database.write("testDb");
database.read("testDb");
Scanner scanner = new Scanner(System.in);
System.out.println("Press ENTER to stop");
String s= scanner.nextLine();
scanner.close();
database.destroy("testDb");
return 0;

14
src/main/java/biz/nellemann/memstress/MyDatabase.java
View file

@ -56,7 +56,7 @@ public class MyDatabase {
for (int t = 1; t <= maxTables; t++) {
String tableName = String.format("table_%d", t);
log.info("Creating table \"{}\"", tableName);
log.debug("Creating table \"{}\"", tableName);
Table table = database.createTable(tableName);
@ -74,7 +74,7 @@ public class MyDatabase {
}
Instant instant2 = Instant.now();
log.info("Done writing {} to \"{}\" in {}", bytesWritten, dbName, Duration.between(instant1, instant2));
log.info("Done writing {}b to \"{}\" in {}", bytesWritten, dbName, Duration.between(instant1, instant2));
}
@ -87,13 +87,17 @@ public class MyDatabase {
table.getRows().forEach((idx, row) -> {
HashMap<String, ByteBuffer> values = row.getColumnValuesMap();
values.forEach((str, byteBuffer) -> {
byte[] array = byteBuffer.array();
bytesRead.addAndGet(array.length);
byteBuffer.rewind();
while (byteBuffer.hasRemaining()) {
byte[] tmp = new byte[BYTE_SIZE_1MB];
byteBuffer.get(tmp);
bytesRead.addAndGet(tmp.length);
}
});
});
}
Instant instant2 = Instant.now();
log.info("Done reading {} from \"{}\" in {}", bytesRead.get(), dbName, Duration.between(instant1, instant2));
log.info("Done reading {}b from \"{}\" in {}", bytesRead.get(), dbName, Duration.between(instant1, instant2));
}