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package mpjdev.perftest;
import mpjdev.*;
import mpjbuf.*;
import java.io.*;
public class Bandwidth {
public Bandwidth() {
}
public Bandwidth(String[] args) throws Exception {
MPJDev.init(args);
int SEND_OVERHEAD = MPJDev.getSendOverhead() ;
int RECV_OVERHEAD = MPJDev.getRecvOverhead() ;
Buffer buffer = null;
Buffer rbuffer = null ;
byte[] byteArray = new byte[16*1024*1024] ;
int WARM_UP = 10000 ;
int REPEAT = 20000 ;
int j = 1, i = 0;
int LOG2N_MAX = 1000000, log2nbyte = 0, padding = 0;
PrintStream out = null ;
FileOutputStream fos = null ;
long[] delays = new long[REPEAT];
long[] latency = new long[REPEAT];
long start= 0L, stop=0L, init = 0L;
int me = MPJDev.WORLD.id() ;
if(me == 1) {
fos = new FileOutputStream("bw_delays.out");
out = new PrintStream (fos);
}
else {
fos = new FileOutputStream("bw.out");
out = new PrintStream (fos);
}
/* Logrithmic Loop */
for (log2nbyte = 0; log2nbyte <= LOG2N_MAX && j < 64*1024 ;
++log2nbyte) {
j = (1 << log2nbyte);
if ( ( (j / 8) > 1) && j % 8 != 0) {
padding = j % 8;
}
else if ( ( (j / 8) == 0)) {
padding = j;
}
else {
padding = 0;
}
buffer = new Buffer(
BufferFactory.create(8+j+padding+SEND_OVERHEAD),
SEND_OVERHEAD, 8+j+padding+SEND_OVERHEAD );
buffer.putSectionHeader(Type.BYTE);
buffer.write(byteArray, 0, j);
buffer.commit();
rbuffer = new Buffer( BufferFactory.create(8+j+padding+RECV_OVERHEAD),
RECV_OVERHEAD, 8+j+padding+RECV_OVERHEAD );
/* Warm Up Loop */
for (i = 0; i < WARM_UP; i++) {
if (MPJDev.WORLD.id() == 0) {
MPJDev.WORLD.recv(rbuffer, 1, j, true);
MPJDev.WORLD.send(buffer, 1, j, true);
}
else if (MPJDev.WORLD.id() == 1) {
MPJDev.WORLD.send(buffer, 0, j, true);
MPJDev.WORLD.recv(rbuffer, 0, j, true);
}
}
/* Latency Calculation Loop */
for (i = 0; i < REPEAT; i++) {
if (MPJDev.WORLD.id() == 0) {
myDelay( (int) (Math.random() * 1000)) ;
init = System.nanoTime() ;
MPJDev.WORLD.send(buffer, 1, j, true);
MPJDev.WORLD.recv(rbuffer, 1, j, true);
latency[i] = ((System.nanoTime() - init)/1000) ;
}
else if (MPJDev.WORLD.id() == 1) {
MPJDev.WORLD.recv(rbuffer, 0, j, true);
start = System.nanoTime() ;
myDelay( (int)(Math.random() * 1000));
delays[i] = (System.nanoTime() - start)/1000 ;
MPJDev.WORLD.send(buffer, 0, j, true);
}
}
BufferFactory.destroy( buffer.getStaticBuffer());
BufferFactory.destroy( rbuffer.getStaticBuffer());
if(me == 0) {
for(int k=WARM_UP; k<REPEAT ; k++) {
out.println(latency[k]+" ");
}
}
else {
for (i = WARM_UP ; i < REPEAT ; i++) {
out.println(delays[i]+" ");
}
}
MPJDev.WORLD.barrier() ;
} //end logrithmic loop
MPJDev.finish();
}
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 ;
}
}
}
}
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