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# vi /etc/sysctl.conf
net.nf_conntrack_max = 1100000

// ....   
                Socket s = new Socket();
                // 这行改成 s.bind(new InetSocketAddress(lIp, i+5000)); 
                //  我这边实际测试, 当单个 ip 占用 端口数超过 3万时, 客户端的 cpu 会急剧上升
               //  直接指定端口 s.bind(new InetSocketAddress(lIp, i+5000)); 就可以解决这个问题 
                s.bind(new InetSocketAddress(lIp, 0));
                s.connect(new InetSocketAddress(sIp, sPort));
....