运行时错误java/mpi(被零除)
我收到以下运行时错误:运行时错误java/mpi(被零除),java,mpi,Java,Mpi,我收到以下运行时错误: C:\Users\Richard\Dropbox\Year 3\DISPARP\Coursework>mpjrun -np 2 -dev niodev Ping PongVariousLengths MPJ Express (0.35) is started in the cluster configuration Starting process <0> on <Tornado> Starting process <1> on
C:\Users\Richard\Dropbox\Year 3\DISPARP\Coursework>mpjrun -np 2 -dev niodev Ping
PongVariousLengths
MPJ Express (0.35) is started in the cluster configuration
Starting process <0> on <Tornado>
Starting process <1> on <Tornado>
Time for the ping to be sent and recived of 1 kb is 7 miliseconds
transferRate: 142.85714285714286KB per second
Speed of network in Mbps: 0
Time for the ping to be sent and recived of 2 kb is 0 miliseconds
transferRate: InfinityKB per second
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at runtime.daemon.Wrapper.execute(Wrapper.java:165)
at runtime.daemon.Wrapper.main(Wrapper.java:180)
Caused by: java.lang.ArithmeticException: / by zero
at PingPongVariousLengths.main(PingPongVariousLengths.java:32)
... 6 more
这导致了错误,我如何解决这个错误,它仍然除以0,但返回0
如果您需要代码,只需说:)
谢谢你的帮助
编辑
代码:
if (myrank == 0) {
for (int len = minlen; len <= maxlen; len *= 2) { //len=*2 doubles the ping size each time
long startTime = System.currentTimeMillis();
MPI.COMM_WORLD.Send(sendbuff, 0, len, MPI.CHAR, 1, tag);
MPI.COMM_WORLD.Recv(recvbuff, 0, len, MPI.CHAR, 1, tag);
long endTime = System.currentTimeMillis();
long duration = endTime - startTime;
System.out.println("Time for the ping to be sent and recived of " + len + " kb is " + duration + " miliseconds");
double transferRate = (len * 1000.0)/ duration ; //amount of data in kilobytes transferred in 1 second
System.out.println("transferRate: " + transferRate + "KB per second");
speedKbps = (len / duration);
speedMbps = (speedKbps / 1024);
System.out.println("Speed of network in Mbps: " + speedMbps);
}
} else if (myrank == 1) {
for (int len = minlen; len <= maxlen; len *= 2) {
MPI.COMM_WORLD.Recv(recvbuff, 0, len, MPI.CHAR, 0, tag);
MPI.COMM_WORLD.Send(recvbuff, 0, len, MPI.CHAR, 0, tag);
}
}
if(myrank==0){
对于(int len=minlen;len尝试使用
long startTime = System.nanoTime();
...
long endTime = System.nanoTime();
并调整Nano的所有计算
如果它不起作用,就在这里检查零
speedKbps = duration == 0 ? <big number here> : (len / duration);
speedKbps=duration==0?:(len/duration);
我想说你有两个选择:1)假设持续时间可以为零,在使用它进行除法之前检查它。2)使用“system.nanoTime()”而不是“currentTimeMillis()”,并相应地调整代码。谢谢,我需要将nanoTime乘以多少才能让用户以秒为单位显示结果?millis=10^-3,Nano=10^-9
speedKbps = duration == 0 ? <big number here> : (len / duration);