analyze the overall page performance metrics. If you want to get performance metrics for individual resources (such as JS, pictures), use the resource Timing API.The navigationtiming has just announced a 2, which will replace the previous version.High Resolution Timing (precision timing)The JavaScript interface defined by the API specification provides the curre
Linux uses iostat to analyze IO performance and linuxiostatio Performance
Original article: http://www.cnblogs.com/bangerlee/articles/2547161.html
For I/O-bond processes, we often use iostat to view the number of IO requests issued by processes and the time consumed by the system to process IO requests, then, analyze w
This article describes how to use XHProf and XHGui in Linux to analyze the PHP running performance. this solution supports Apache and Nginx servers and multiple database environments. For more information, see
What is performance analysis?Performance analysis is to measure the relative
Build high performanceASP. NETOne site Analyze the page processing process (front-end)
InASP. NETWhen optimizing websitesASP. NETThat's enough. In the process of optimization, we usually first find out where the problem may exist, and then prove that the problem is to be solved. After confirmation, we will take some measures. SeriesArticleThe structure is as follows: first introduce the front-end optimization, and I will mark it after the title of t
Reprinted from: http://blog.csdn.net/guolin_blog/article/details/42238633Since Android is an operating system developed for mobile devices, we should always take the memory issue into account when developing applications. Although the Android system has a garbage collection mechanism, this does not mean that we can completely ignore when to allocate or free memory. Even if we all follow the programming recommendations given in the previous article to write programs, there is a good chance of mem
There are fewer tutorials on iOS performance tuning, and the decision to write an iOS performance Tuning series focuses on several aspects of memory leaks, performance optimization, traffic, and power analysis.Xcode has provided a very powerful performance tuning tool, combined with several third-party tools and some t
This document introduces the functions and usage of IBM page detailer, and uses an example to demonstrate how to analyze the results obtained by IBM page detailer and provide suggestions for improving the web application performance.
Introduction
In the daily work of performance testing, testers often need some tools to provide us with
There are fewer tutorials on iOS performance tuning, and the decision to write an iOS performance Tuning series focuses on several aspects of memory leaks, performance optimization, traffic, and power analysis.Xcode has provided a very powerful performance tuning tool, combined with several third-party tools and some t
Source:https://msdn.microsoft.com/zh-cn/magazine/dn973013 (en-us). aspxMany developers spend most of their time getting application talent to function properly. Focus on the performance of your application in less time.Despite having a very long time analyzing tools in Visual Studio, they are a separate set of learning tools. Many developers do not take the time to learn and use them when there are performance
production environment, which is easy to implement in SaaS.)There are many products for benchmark testing, including Ab,siege and JMeter. I personally prefer the JMeter feature set, but AB and siege are more usable.
Once you are sure that the application has a performance problem, you need to analyze its performance, implement the improvements, and then test th
to Redis import redis
Rdb = Redis () with
timer () as T:
rdb.lpush ("foo", "Bar")
print "=> elasped Lpush:%s S"% t.secs with
Timer () as T:
rdb.lpop ("foo")
print "=> elasped Lpop:%s S "% t.secs
To see how the performance of my programs evolves over time, I often record the output of these timers to a file.use Profiler to time and analyze execution frequency
Robert Kern has a nice project
Configuration parameter values. On the other hand, DB2 provides optimization functions for queries. For example, SQL Explain Facility can be used to analyze an Access Plan after an SQL statement is optimized), and the Command line Editor (Command Editor) A graphical view of the access plan is also provided. However, if you want to monitor and analyze the performance
. analyze nmon datawith the above command, after the number of acquisitions arrives, the Xxxx.nmon file is generated in the specified directory , and the common way to analyze. Nmon files is to use nmon_analyser.xlsm, by importing A. Nmon file that displays data in an Excel file. three python parsing The posture of Nmonthrough the above analysis, the common method of obtaining Nmon file data is mainly ap
Analysis toolsA free tool for analyzing AIX and Linux performance, the Nmon tool helps to display all of the important performance tuning information on one screen and dynamically update it. This efficient tool can work on any dumb screen, Telnet session, or even dial-up lines. In addition, it does not consume a lot of CPU cycles, usually less than 2%. On the updated computer, its CPU utilization will be le
Hard Canton: "iOS Performance Tuning Series" fourth, is expected to be more than 20, continuously updated, welcome attention.Top two iOS Performance Tuning series: Analyze static Analysis, iOS Performance Tuning series: using instruments to dynamically analyze memory leaks f
IOS Performance Tuning series: use Allocation to dynamically Analyze memory usage and optimize allocation
Hardware wide: article 3 of the IOS Performance Tuning series, which is continuously updated.
IOS Performance Tuning series: Analyze static analysis describes how to use
($dbScreenItems)) {
As you can see, if it is a Super User, no permission check is performed. Otherwise, a very complicated permission check process is performed.
I printed the corresponding SQL statement and found that it was very long and executed for up to 4.8 s, which is consistent with the DBselect in the preceding xhprof diagram.
The speed is also slow.Solution
After the code has been located, the solution is no longer a problem. Simply comment it out.Verification results
Try again to captu
: This article describes how to use xhprof to track and analyze online PHP performance. For more information about PHP tutorials, see.
I have been using Xdebug-based PHP for performance analysis. it is enough for the local development environment. However, if it is an online environment, xdebug consumes a lot and the configuration is not flexible enough, there
This article describes how to use the showprofile command in MySQL to analyze performance. showprofiles is a common command for database performance optimization, for more information, see how to donate the show profile to the MySQL community by Jeremy Cole. This feature is disabled by default, but can be enabled at the session level. Enabling It allows MySQL to
We analyzed the table just now. We can see that there are two options, performance and Document Manager, under the menu analysis option. The two options are described below. Click the analysis item in the tool menu and select the performance command. Now we start to analyze the performance of the entire database. For e
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