[英]is this code transferring 1kb or in bits ? a little confused
i have been trying to test network performance, but have a question 我一直在尝试测试网络性能,但是有一个问题
static public void main(String[] args)
{
MPI.Init(args);
int myrank = MPI.COMM_WORLD.Rank();
int tag = 99;
int maxlen = 104857600;
int minlen = 1; //1kb ?
char [] sendbuff = new char [maxlen];
char [] recvbuff = new char [maxlen];
long speedKbps;
long speedMbps;
if (myrank == 0)
{
for (int len = minlen; len <= maxlen; len *= 2)
{ //len=*2 doubles the ping size each time
long startTime = System.nanoTime();
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.nanoTime();
long duration = endTime - startTime;
System.out.println("Time for the ping to be sent and recived of " + len + " kb is " + duration + " nanoseconds");
double transferRate = (len/ duration ) ; //amount of data in kilobytes transferred in 1 second
System.out.println("transferRate: " + transferRate + "KB per second");
}
}
}
The minlen = 1
, what size is this, is it 1 KB, 1 bit, 1 byte? minlen = 1
,它的大小是1 KB,1位,1字节?
Thanks 谢谢
由于您的发送缓冲区使用char作为数据类型,因此它是字节。
Since you're sending items from a character array, len in each iteration of the loop is the number of characters to send. 由于您要从字符数组发送项目,因此循环的每次迭代中的len是要发送的字符数。 So the size of minlen=1 is the size of 1 character, which in Java is 2 bytes. 因此minlen = 1的大小为1个字符的大小,在Java中为2个字节。
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