org.epics.pvmanager.sample.ScannerLoadTest Maven / Gradle / Ivy
/**
* Copyright (C) 2010-12 Brookhaven National Laboratory
* All rights reserved. Use is subject to license terms.
*/
package org.epics.pvmanager.sample;
import java.util.ArrayList;
import java.util.List;
import org.epics.pvmanager.PV;
import org.epics.pvmanager.PVManager;
import org.epics.pvmanager.loc.LocalDataSource;
import static org.epics.pvmanager.ExpressionLanguage.*;
import org.epics.util.time.TimeDuration;
/**
* Load test to see the effect on the performance of the scanning.
*
* The test opens a number of local pvs. Since there is no load associated
* on keeping the local pv open, the total cpu load can be assumed to be
* the scanning. If can also be used to optimize memory consumption.
*
* 2012/11/12 - 1,000 pvs, 1.8%; 10,000 pvs, 18.9%; 100,000 pvs, 34%. GC time ~0%
*
* @author carcassi
*/
public class ScannerLoadTest {
public static void main(String[] args) throws Exception {
PVManager.setDefaultDataSource(new LocalDataSource());
List> pvs = new ArrayList<>();
int nPvs = 100000;
for (int i = 0; i < nPvs; i++) {
PV pv = PVManager.readAndWrite(channel("channel " + i)).asynchWriteAndMaxReadRate(TimeDuration.ofHertz(50));
pvs.add(pv);
}
System.out.println("Started");
Thread.sleep(60000);
for (PV pv : pvs) {
pv.close();
}
}
}