latency checker

Interrupt latency or interruption DelayThis refers to the time period from the interruption generation to the CPU response interruption, that is, the time period from T2 to T3 in the figure. The interrupt latency is caused by the kernel disabling the interrupt response of the CPU before entering the critical section. During this period, although the external device makes the interrupt request line of the CP

How can I determine the Master/Slave latency of a MySQL database? In this paper, we introduce two judgment methods: 1. Seconds_Behind_Mastervs2.mk-heartbeat, then we will introduce these content respectively. In daily work, for MySQL master-slave replication check, on the one hand, we need to ensure that the overall structure of replication is normal, on the other hand, we need to check master-slave data How can I determine the Master/Slave

This time, we will separately investigate the time of Master/Slave latency. The master-slave latency mentioned here is not ldquo; slave database update performance cannot keep up with the master database rdquo; it is ldquo; a command slave This time, we will separately investigate the time of Master/Slave latency. The master-slave

Latency of next-generation SSD controller based on low-density Inspection Author: Stephen BatesLatency Variability In the previous blog, I talked about how the Error Correction Code (ECCS) in the enterprise-level SSD controller is being converted to Low-Density Parity Check (Low-Density Parity Check. This article also implies that this conversion will have a profound impact on the latency in the next-genera

How can we delay your program by 1 ms, 2 Ms ...... I used the timer () function for a long time when I used vbprogramming. However, after careful analysis, we will find that the timer () function has a very low precision, and the precision can only reach a dozen milliseconds. That is to say, if your intention is to delay 1 millisecond, in fact, the latency is several dozen milliseconds. What is the evidence? How can we see it? The following simple vbp

MySQL master-slave replication is an important part of the MySQL high-availability architecture. It can be used to achieve load balancing, high availability and failover, and provide backup. For master-slave replication monitoring, it is not reliable to rely solely on the showslavestatus provided by MySQL itself. Pt-heartbeat is a good choice for master-slave replication latency monitoring. This article describes MySQL master-slave replication is an i

timing precision requirements, such as dynamic display of Bitmap. Method 2: Use the sleep () function in VC to implement latency. Its unit is ms. For example, if the latency is 2 seconds, use sleep (2000 ). The accuracy is very low, and the minimum timing accuracy is only 30 ms. The disadvantage of using the sleep function is that other messages cannot be processed during the delay period. If the time is t

In Android, latency functions are divided into user space and kernel space: Kernel space # Include Udelay (int n ); Mdelay (INT n )); Ndelay (INT n )); These functions will lead to an endless cycle of CPU and lead to a busy wait of CPU. Usleep (int n ); Msleep (INT n )); Nsleep (INT n )); The difference between the first group and the second group of latency functions is that the first group of

We know that there are many concepts in computers that are not easy to understand. sometimes, a good analogy can beat many explanations. The following are two wonderful metaphors I have seen. let's share them with you. The first analogy is about throughput and latency. We know that there are many concepts in computers that are not easy to understand. sometimes, a good analogy can beat many explanations. The following are two wonderful metaphors I have

Ask for help! About network latency! -- Linux Enterprise Application-Linux server application information. For details, refer to the following section. I recently studied network latency. I have learned from some papers that network latency depends on four parts: the processing latency of the sending end, the transmiss

HTTP transaction latency-TCP impact Recently, I have read the HTTP authoritative guide, a big part of which often reminds us of boring usage and technical indicator explanations ...... make people big. However, this book makes me feel "fresh". On the one hand, the author uses easy-to-understand languages and a large number of icons, which makes us easy to understand, on the other hand, I have always been interested in network programming and have a g

We know that there are many concepts in computers that are not easy to understand. sometimes, a good analogy can beat many explanations. The following are two wonderful metaphors I have seen. let's share them with you. We know that there are many concepts in computers that are not easy to understand. sometimes, a good analogy can beat many explanations. The following are two wonderful metaphors I have seen. let's share them with you. The first analogy is about throughput and

user requests to participate in the interaction, the moderator agreed to a user's request;3 The user participates in the live broadcast, the user and the host's interactive process live to all other fans;So how do you achieve a function like this? Today we will introduce several methods of implementation;The first way is through two RTMP streams to achieveThe current live protocol is commonly used by the RTMP protocol, which is an adobe implementation of a proprietary protocol for audio and vid

"I chose to use animations instead of transitions when doing some of the effects on the mobile side today, and this 300ms click Delay is one of the main reasons why I use animations instead of using transitions"Animations and TransitionsCommon denominator: All CSS controls dom motion,Different points:1, Transition: Only two keyframes, start and end;2. Animation can set multiple keyframes3. Transitions must be triggered by events4, the animation does not need to open can move"CSS execution faster

MySQLDatabaseMaster/Slave latencyHow to judge? This article introduces two methods for judging: 1. Seconds_Behind_Master vs 2. mk-heartbeat. Next we will introduce these methods separately. In daily work, for MySQL master-slave replication check, on the one hand, we need to ensure that the overall structure of the replication is normal, on the other hand, we need to check whether the master-slave data is consistent. For the former, we can monitor whether the replication thread is working normall

First, declare that the "high concurrency" here is relative, relative to the hardware, rather than absolute high concurrency. The latter must be implemented in a distributed manner. We will not discuss it here. This article focuses on the high concurrency of a single machine. Recently, a voice communication system was developed, requiring online users and 1 K concurrent calls. The hardware is two servers, core and multi-core, 4G memory, and 1g NIC (the best hardware I have ever used, so it shoul

Reprinted from: Http://www.jianshu.com/p/6e2b68a93c88 One, mobile 300ms click DelayIn general, if the mobile browser is distributing the Click event without special processing, there will usually be a delay of around 300ms. That is, when we click on the page, the mobile browser does not respond immediately, but will wait for a few moments before the effect of clicking. In the early days of the mobile web, users ' sense of 300ms latency was not obvious

fixed sampling because mouse input is continuous data. If a message is used, moving the mouse once may produce many sampling requests. In addition, hybrid sampling can be combined for 1, 2, and fixed sampling for the mouse, while message sampling can be used for other keys. To reduce latency, the client can immediately simulate the calculation result after sending out the sample, and then start to make predictions. After the server receives the samp

Modifying the Registry improves the slow network speed caused by Tcp latency in Windows. TCP is a link-oriented communication protocol. Each sending and receiving action of both parties must be based on the normal communication link. Therefore, TCP provides the default ACK authentication mechanism. The ACK authentication method is related to the operating system. In TCP, data validation is often delayed. When the delay timer does not overflow, general

Processing of network latency in online shooting games (Jinqing's column) Network latency in online games is unavoidable.For example, if a mobile client sends a command to receive confirmation from the server, there will be a latency of Ms,If the client is moved after ms, the operability will be very poor.Generally, it does not wait for the server to confirm. M