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搭建高可用mongodb集群（三）—— 深入副本集内部机制 - 大数据 & AI - 清...
...好。这个“12”、“7”数字还好，通过他们官方经过性能测试定义出来可以理解。具体还有哪些限制参考官方文档《 MongoDB Limits and Thresholds 》。 但是这里一直没搞懂整个集群为什么要奇数，通过测试集群的数量为偶数也是可以...
Sending websocket ping/pong frame from browser
I keep reading about ping/pong messages in websockets to keep the connection alive, but I'm not sure what they are. Is it a distinct frame type? (I don't see any methods on a javascript WebSocket object in chrome related to ping-pong). Or is it just a design pattern (e.g. I literally send "ping" o...
Using ping in c#
When I Ping a remote system with windows it says there is no reply, but when I ping with c# it says success. Windows is correct, the device is not connected. Why is my code able to successfully ping when Windows is not?
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How to sleep for five seconds in a batch file/cmd [duplicate]
Windows's Snipping tool can capture the screen, but sometimes I want to capture the screen after five seconds, such as taking an image being displayed by the webcam. (Run the script and smile at the camera, for example.)
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Windows下 C++网络延时检测 - C/C++ - 清泛网 - 专注C/C++及内核技术
...这个功能是如何实现的呢？直接上代码吧，亲测可用：
Ping.h
#ifndef CPING_H
#define CPING_H
#include <windows.h>
#include <conio.h>
#include <winnt.h>
#define PING_TIMES 2 //ping 4 次
typedef struct _IPINFO
{
unsigned char Ttl; // Time To Live
unsigned ch...
Why does InetAddress.isReachable return false, when I can ping the IP address?
Why does isReachable return false ? I can ping the IP.
10 Answers
10
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What is the best way to check for Internet connectivity using .NET?
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This is probably better than pinging Google, because I think we have no guarantee that Google continues to respond to pings. On the other hand, I cannot image a world where www.google.com does not return some HTML :)
– Daniel Vassal...
How to wait in a batch script? [duplicate]
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You can ping an address that surely doesn't exist and specify the desired timeout:
ping 192.0.2.2 -n 1 -w 10000 > nul
And since the address does not exists, it'll wait 10,000 ms (10 seconds) and returns.
The -w 10000 part spe...
ping response “Request timed out.” vs “Destination Host unreachable”
When I ping an IP address, what is the difference between Request timed out and Destination host unreachable returned from the command?
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Cannot ping AWS EC2 instance
I have an EC2 instance running in AWS. When I try to ping from my local box it is not available.
25 Answers
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