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package driver;
import java.lang.Thread.State;
import java.util.ArrayList;
import java.util.Locale;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicLongFieldUpdater;
import shared.Parse;
import shared.PreParser;
import shared.Shared;
import shared.Timer;
/**
* @author Brian Bushnell
* @date Sep 25, 2014
*
*/
public class TestLockSpeed {
public static void main(String[] args){
{//Preparse block for help, config files, and outstream
PreParser pp=new PreParser(args, new Object() { }.getClass().getEnclosingClass(), false);
args=pp.args;
//outstream=pp.outstream;
}
int mode=0;
long max=1000000000;
int threads=Shared.threads();
for(int i=0; i<args.length; i++){
String arg=args[i];
String[] split=arg.split("=");
String a=split[0].toLowerCase();
String b=split.length>1 ? split[1] : null;
if(a.equals("mode")){
mode=Integer.parseInt(b);
}else if(a.equals("threads") || a.equals("t")){
threads=Integer.parseInt(b);
}else if(a.equals("max")){
max=Parse.parseKMG(b);
}else{
System.err.println("Unknown parameter "+args[i]);
assert(false) : "Unknown parameter "+args[i];
// throw new RuntimeException("Unknown parameter "+args[i]);
}
}
CountBox box;
if(mode==UNLOCKED || mode==LOCKED){
box=new LockBox();
}else if(mode==ATOMIC){
box=new AtomBox();
}else if(mode==VOLATILE || mode==FIELD || mode==STATICFIELD){
box=new VolatileBox();
}else{
throw new RuntimeException("Unknown mode "+mode);
}
ArrayList<CountThread> list=new ArrayList<CountThread>(threads);
for(int i=0; i<threads; i++){
list.add(new CountThread(box, max, mode));
}
Timer t=new Timer();
for(CountThread ct : list){ct.start();}
for(CountThread ct : list){
while(ct.getState()!=State.TERMINATED){
try {
ct.join();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
t.stop();
System.out.println("Time: \t"+t);
System.out.println("Count: \t"+box.value());
System.out.println("Speed: \t"+String.format(Locale.ROOT, "%.3f", (threads*max*1.0)/(t.elapsed))+" giga per second");
}
static class CountThread extends Thread{
public CountThread(CountBox box_, long max_, int mode_){
box0=box_;
max=max_;
mode=mode_;
}
@Override
public void run(){
if(mode==UNLOCKED){
final LockBox box=(LockBox)box0;
for(long i=0; i<max; i++){
box.counter++;
}
}else if(mode==LOCKED){
final LockBox box=(LockBox)box0;
for(long i=0; i<max; i++){
box.increment();
}
}else if(mode==ATOMIC){
final AtomBox box=(AtomBox)box0;
for(long i=0; i<max; i++){
box.increment();
}
}else if(mode==VOLATILE){
final VolatileBox box=(VolatileBox)box0;
for(long i=0; i<max; i++){
box.counter++;
}
}else if(mode==FIELD){
final VolatileBox box=(VolatileBox)box0;
final AtomicLongFieldUpdater<VolatileBox> updater=AtomicLongFieldUpdater.newUpdater(VolatileBox.class, "counter");
for(long i=0; i<max; i++){
updater.incrementAndGet(box);
}
}else if(mode==STATICFIELD){
final VolatileBox box=(VolatileBox)box0;
for(long i=0; i<max; i++){
box.increment();
}
}
}
final CountBox box0;
final long max;
final int mode;
}
abstract static class CountBox{
abstract void increment();
abstract long value();
}
static class LockBox extends CountBox{
@Override
synchronized void increment(){counter++;}
@Override
long value(){return counter;}
long counter;
}
static class AtomBox extends CountBox{
@Override
void increment(){counter.incrementAndGet();}
@Override
long value(){return counter.longValue();}
AtomicLong counter=new AtomicLong(0);
}
static class VolatileBox extends CountBox{
@Override
void increment(){updater.incrementAndGet(this);}
@Override
long value(){return counter;}
volatile long counter;
static final AtomicLongFieldUpdater<VolatileBox> updater=AtomicLongFieldUpdater.newUpdater(VolatileBox.class, "counter");
}
static final int UNLOCKED=0, LOCKED=1, ATOMIC=2, VOLATILE=3, FIELD=4, STATICFIELD=5;
}
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