pfmiles

package com.awilmore.ioutils;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.SeekableByteChannel;
import java.nio.channels.WritableByteChannel;

public class IOUtil {

pfmiles

L1 cache reference                  0.5 ns
Branch mispredict                   5 ns
L2 cache reference                  7 ns
Mutex lock/unlock                   25 ns
Main memory reference               100 ns
Compress 1K bytes with Zippy        3,000 ns // 3微秒
Send 2K bytes over 1 Gbps network   20,000 ns // 20微秒
Read 1 MB sequentially from memory  250,000 ns // 0.25毫秒
Round trip within same datacenter   500,000 ns // 0.5毫秒
Disk seek                           10,000,000 ns // 10毫秒