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Performance tests based on user experience: Chapter 2 simulates the latency of individual users

Copyright:Based on the spirit of sharing, this article can be reproduced to benefit more test peers. Please retain this copyright statement upon reprinting and ensure the integrity of the article, but shall not be used for any commercial or other purposes for profit purposes.Original article name: user experience, not metricsOriginal Author: Scott barberSource: http://www.perftestplus.com/resources/UENM2.pdfTranslation name: Performance Test Based on User ExperienceTranslation: pentHttp://www.cn

How to Set latency in JavaScript programs

In JavaScript, there are two ways to set latency (timedelay ). The first method is very simple. This method will wait for the set duration before running the function code. The second method is the same, but it will repeatedly run the function code. Note that the minimum latency of many browsers is between 25 to 75 milliseconds, and the minimum latency of some ex

Garbage collection optimization for high throughput and low latency Java applications

Garbage collection optimization for high throughput and low latency Java applicationsHigh-performance applications form the backbone of modern networks. LinkedIn has many internal high-throughput services to meet user requests thousands of times per second. To optimize the user experience, it is important to respond to these requests with low latency.For example, one feature that users often use is to learn about dynamic information-a list of professi

Detects and solves latency and blocking I/O problems in SQL Server 2000 SP 4

Detecting and solving latency and blocking I/O problems in SQL Server 2000 SP 4 released on: 7/13/2005 | updated on: 7/13/2005 Robert DorrMicrosoft Corporation Abstract:Special columnist Robert Dorr explores how reporting tools in SQL Server 2000 Service Pack 4 significantly reduce the time spent identifying and identifying the root cause of latency and blocking I/O operations. Content on this page

Garbage collection optimization for high throughput and low latency Java applications

Original link: LinkedIn translation: Importnew.com-hejianiLink: http://www.importnew.com/11336.htmlHigh-performance applications form the backbone of modern networks. LinkedIn has many internal high-throughput services to meet user requests thousands of times per second. To optimize the user experience, it is important to respond to these requests with low latency.For example, one feature that users often use is to learn about dynamic information-a list of professional activities and content tha

[Virtualization practice] storage design 6 latency

In [virtualization practice] Five iops of the storage design, we talked about three key indicators for evaluating the storage performance. That is, throughput, iops, and latency. And the relationship between the three. This article provides an in-depth description of the causes and suggestions for high latency. High latency directly reduces the performance of vir

Concepts of network latency

Assume that A data packet X ranges from router A to router B. In this case, the total latency of data packet X from router A to router B is analyzed: When A receives A packet, it detects the packet header and determines which link the packet is directed to. The time required for this process is called the node processing latency. The advantages and disadvantages of a router play a decisive role in processi

Garbage collection optimization for high throughput and low latency Java applications

Garbage collection optimization for high throughput and low latency Java applicationsHigh-performance applications form the backbone of modern networks. LinkedIn has many internal high-throughput services to meet user requests thousands of times per second. To optimize the user experience, it is important to respond to these requests with low latency.For example, one feature that users often use is to learn about dynamic information-a list of professi

Long latency, upstream and downstream

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

Some common latency methods in VxWorks Embedded Systems

1 taskdelay Taskdelay (n) delays the task calling this function by N tick (kernel clock cycle ). This task voluntarily abandons the CPU at the specified time, except that taskdelay (0) is dedicated to task scheduling (giving the CPU to other tasks with the same priority, task latency is also commonly used to wait for an external event as a timing/latency mechanism. Taskdelay can be easily implemented when

Several common latency methods in VxWorks

During application programming, a task usually needs to execute a specified action after a specific delay, such as waiting for peripherals to ensure data reliability, control speaker voice time and serial communication timeout and resend. This requires the timer mechanism to measure a specific length of time. As a real-time embedded system, VxWorks provides various timing interface functions. The following describes some common timing methods based on my project experience and online references,

Use pt-heartbeat to monitor master-slave replication latency

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

VC ++ latency Functions

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

Latency functions in Android

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

A wonderful comparison of throughput, latency, Semaphore, and mutex lock

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

[Reprinted] response frequency and group latency

Label: style blog HTTP use ar sp 2014 art C Although the phase frequency response should reflect the processing time of different frequency signals, it does not mean that the larger the phase frequency response, the longer the system processing time. We can know from a simple sine signal exp (J * w * n) that the phase is w * n, that is, the phase is not only related to time, but also frequency. In signal processing, group delay is another concept used to characterize the system delay time. Its

How do I check the Master/Slave latency of the MySQL database?

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

Build a high-concurrency and Low-latency System

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

Mobile-click 300ms Latency

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

MySQL master-slave database synchronization latency problem solved _ MySQL

MySQL master-slave database synchronization latency problem solved recently I was conducting a MySQL master-slave database synchronization test and found some problems, among which the master-slave synchronization latency problem is one of them. the following content is some explanations found on the Internet, record it for your own learning; The master-slave synchronization of MySQL is a mature architectu

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