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package mpi.perf;
import mpi.*;
import java.nio.ByteBuffer ;
import java.io.FileOutputStream ;
import java.io.PrintStream ;
import java.io.Serializable ;
public class Latency {
public Latency() {
}
public Latency(String[] args) throws Exception {
int OBJ = 1 ; //Integer.parseInt(args[0]) ;
int REPEAT = 1 ;
int WARM_UP = 0 ;
long ST = 30000000 ;
int SENSIBLE = 0;
long start= 0L, stop;
long totalTime = 0L;
int j,i,me ;
long timed = 0L;
long[] latency = new long[REPEAT] ;
long[] delays = new long[REPEAT] ;
byte [] byteArray = new byte [1*1024*1024];
Long min = Long.MAX_VALUE ;
Long max = Long.MIN_VALUE ;
long init = 0L;
PrintStream out = null ;
FileOutputStream fos = null ;
MPI.Init(args);
me = MPI.COMM_WORLD.Rank();
j=1;
Message [] msg = new Message[1] ;
for(int e=0 ; e<msg.length ; e++) {
msg[e] = new Message() ;
}
for(i =0;i < byteArray.length;i++) {
byteArray[i] = 's';
}
if(me == 1) {
fos = new FileOutputStream("mpj_delays.out");
out = new PrintStream (fos);
}
for(i=0;i < WARM_UP ;i++) {
if(me == 0) {
if(OBJ == 1) {
MPI.COMM_WORLD.Recv(msg,0,msg.length,MPI.OBJECT,1,998);
MPI.COMM_WORLD.Send(msg,0,msg.length,MPI.OBJECT,1,998);
}
else {
MPI.COMM_WORLD.Recv(byteArray,0,byteArray.length,MPI.BYTE,1,998);
MPI.COMM_WORLD.Send(byteArray,0,byteArray.length,MPI.BYTE,1,998);
}
}
else if(me == 1) {
if(OBJ == 1) {
MPI.COMM_WORLD.Send(msg,0,msg.length,MPI.OBJECT,0,998);
MPI.COMM_WORLD.Recv(msg,0,msg.length,MPI.OBJECT,0,998);
}
else {
MPI.COMM_WORLD.Send(byteArray,0,byteArray.length,MPI.BYTE,0,998);
MPI.COMM_WORLD.Recv(byteArray,0,byteArray.length,MPI.BYTE,0,998);
}
}
}
/* Logrithmic Loop */
for(int k=0; k<REPEAT ;k++) {
/* Latency Calculation Loop */
if(me == 0) {
//myDelay( (int)(1000* ((double)rand() /
// ((double)(RAND_MAX)+(double)(1)))));
myDelay( (int) (Math.random() * 1000));
init = System.nanoTime() ;
if(OBJ == 1) {
MPI.COMM_WORLD.Send(msg,0,msg.length,MPI.OBJECT,1,998);
MPI.COMM_WORLD.Recv(msg,0,msg.length,MPI.OBJECT,1,998);
}
else {
MPI.COMM_WORLD.Send(byteArray,0,byteArray.length,MPI.BYTE,1,998);
MPI.COMM_WORLD.Recv(byteArray,0,byteArray.length,MPI.BYTE,1,998);
}
latency[k] = ( (System.nanoTime() -init)/1000 );
} else if(me == 1) {
if(OBJ == 1) {
MPI.COMM_WORLD.Recv(msg,0,msg.length,MPI.OBJECT,0,998);
}
else {
MPI.COMM_WORLD.Recv(byteArray,0,byteArray.length,MPI.BYTE,0,998);
}
start = System.nanoTime() ;
myDelay( (int)(Math.random() * 1000));
delays[k] = (System.nanoTime() - start)/1000 ;
if(OBJ == 1) {
MPI.COMM_WORLD.Send(msg,0,msg.length,MPI.OBJECT,0,998);
}
else {
MPI.COMM_WORLD.Send(byteArray,0,byteArray.length,MPI.BYTE,0,998);
}
}
/* End latency calculation loop */
}//end logrithmic loop
if(me == 0) {
long total = 0L ;
long sensibleTotal = 0L ;
for(int k=0 ; k<REPEAT ; k++) {
System.out.println(latency[k] );
total += latency[k] ;
if ((new Long(latency[k])).compareTo(min) < 0) {
min = latency[k] ;
}
if ((new Long(latency[k])).compareTo(max) > 0) {
max = latency[k] ;
}
/*
if ((new Long(latency[k])).compareTo(new Long(ST)) < 0) {
SENSIBLE++ ;
sensibleTotal += latency[k] ;
}
*/
}
System.out.println("# min <"+min.longValue()+">");
System.out.println("# max <"+max.longValue()+">");
System.out.println("# avg1 (insane)<"+total/REPEAT+">");
//System.out.println("# avg2 (sane)<"+sensibleTotal/SENSIBLE+">");
//System.out.println("# outrageous counts "+(REPEAT - SENSIBLE));
}
else {
for (i = 0; i < REPEAT ; i++) {
out.println(delays[i]);
}
out.close() ;
fos.close();
}
MPI.Finalize();
}//end args constructor.
static double tripsPerMS = 1000000 ;
static int dummy ;
static void myDelay(int us) {
int trips = (int) (tripsPerMS * us) ;
long start = System.nanoTime() ;
for(int i = 0 ; i < trips ; i++) {
dummy ++ ;
}
long actualDelay = System.nanoTime() - start ;
if(actualDelay > 0 ) {
long newTripsPerMS = (trips * 1000 ) / actualDelay ;
if(newTripsPerMS > 0) {
tripsPerMS = newTripsPerMS ;
}
}
}
}//end class.
class Message implements Serializable {
byte[] msg = new byte[1] ;
}
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