wow latency

Sometimes the computer inexplicably card, but do not know how many cards, delay how much, the following to solve this problem for everyone. 1.win7 system under the search bar input cmd command 2. In the cursor flashing position input command "ping" and then click "Space" we casually link a server, such as Baidu, type the URL "www.baidu.com" after, (meaning: This machine to the address of the server response time, determines the machine to the fluent degree of the server, You can

This behavior can be tricky when our IO-intensive applications suspect device IO jitter, such as a period of long wait times leading to performance or other problems, because the hardware jitter is infrequent and costly to reproduce. Luckily, Systemtap can save us. In principle, the IO we use is accessed through the file system, regardless of read/write/sync, and most of our files are opened in buffered mode. In this mode, if the Pagecache is not hit, you need to access the device. With this ba

About the w764-bit flagship download computer preview function, presumably everyone is very familiar with it? The preview feature is a new feature of our Win7 flagship system, which was not in the previous Windows system, that is, in the taskbar window below our Win7 flagship computer, We use the mouse to point to any of the window, we can appear a preview window, so that we can not click Open to see the contents of it, but recently has made Yong Win7 flagship computer users said that the previe

strictly required that all transactions that are concurrently in the prepare phase are executed concurrently in the repository, so that there may be different seq No in a set of committed transactions You can find that more than the original binary log content last_committed and sequence_number,last_committed represent the time the transaction commits, The number of the last transaction commit, if the transaction has the same last_committed, indicating that the transactions are within a group a

Replica set conn=mongoclient ([' 192.168.3.11:27017 ', ' 192.168.3.12:27017 ', ' 192.168.3.13:27017 ']) # read/write Separation db=conn.get_database (' hnrtest ', read_preference=readpreference.secondary_preferred) # Create Insert Data function Defdata_insert (num): try: foriinrange (1,num): db.student.insert ({"Name": "student" + STR (i), "age": (i%100), "City": "Fuzhou"}) exceptexceptionas e: print ("Insertdata:", e) # Create query data function, Reference adorner function @warps () defdat

Label:1, Reason: because of MySQL to connect the client DNS reverse resolution 2, disable DNS resolution, add Skip-name-resolve 3 in/etc/my.cnf,reverse parsing instructions: The so-called inverse parsing is this:When MySQL receives the connection request, it obtains the client's IP, in order to better match the permission record in the Mysql.user (some are defined by hostname).If the MySQL server has a DNS server set up and the client IP does not have a corresponding hostname on

|waitingforaneventfromcoordinator |NULL | +----+-------------+-----------+------+---------+------+------------------------------------------------------- -+-----------------------+ 7rowsinset (0.00sec)This will successfully open the MySQL 5.7 version of multi-threaded master-slave replication, after configuration in the slave DataDir directory will have the same number of threads set according to the slave_parallel_workers number of threads files:650) this.width=650; "Src=" https://s1.51cto.com/

| +------------------+------------+ 9 rows in Set (0.00 sec) mysql> The calculation delay should be the maximum number of events mysql-bin.000149 minus the number of events that have been executed.That is, 1073822822-1046292913 = 27,529,909 binlog event, plus mysql-bin.000150 this binlog has produced 226,343,255 Binlog event, A total of 226,343,255 Binlog event. namely: 1073822822-1046292913 + 226343255 You can also set pager during the viewing process to see only a few of the status values

monitoring table on the master, it has only one field, store the latest time stamp (high version can be updated with Event_scheduler, the lower version can be updated with cron combined with automatic looping script), the time to read the field on slave, As long as the system time of master and slave is consistent, you can quickly know how much slave and master latencies are poor. However, in a highly concurrent system, this timestamp can be refined to milliseconds, otherwise even if the time i

) resolve the corresponding binlog:mysqlbinlog-v--base64-output=decode-rows--start-position= exec_master_log_pos relay_master_log_ File | LessView the corresponding table to see if the table has a primary key, index structure, etc.(2) Check the system is not overloaded Cpu,memory,io,IO can be viewed through tools iotop and Pt-ioprofileIf it is found that the slave_relay_log_info.ibd file under the MySQL library occupies a high IO, you can consider the large sync_relay_log_info, so that the file

used, and the delete or update format is encountered, using the row format. Summary of the development process of three formats: has been using the statement format, the row format is supported in version 5.1.5. Later, the occurrence of the stored procedure brings new problems. Some functions are called in the stored procedure and will run differently on the slave side. So the 5.1.8 version began to support the mixed format. The goal of all of the above strategies is to keep master in line w

whether the file has changed or not has been synchronized. Will waste some network bandwidth. Need to avoid concurrency. Synchronization of files is repeated concurrently.3. Business implementation1) rsync.sh synchronization script. The script implements checking for a synchronization process every 10 seconds. If not, start the synchronization process, or wait for the synchronization process to be in progress.#!/bin/bash#rsync All#每10秒检查一次, if there is no synchronization process, start the sync

value as the primary key index;7. If there is no such unique index, then InnoDB chooses the built-in 6-byte rowid as an implied clustered index (ROWID is incremented with the write of the row record and the ROWID is not as referenced as the ROWID of Oracle, which is implied).In summary, if the data write order of the InnoDB table is consistent with the leaf node order of the B + Tree index, then the access efficiency is the highest, that is, the following conditions are the highest access effic

Use native JS to encapsulate the Tap event to solve Ms latency on mobile terminals FastClick The existing plug-in fastclick can solve this problem, but it also has drawbacks: The latest version of the plug-in on GitHub is 25.4kb in size, lightweight as the trend, saving time. Its core idea is to cancel the default click Time and determine the type of the current dom node for corresponding operations. This judgment process is cumbersome. MyTapEvent I a

Spydroid-ipcamera This project can turn Android devices into a beautiful IP camera for webcams. Spydroid is a small app that can streams your phone's camera and microphone to your browser or VLC. It's the most powerful tool on the market and a way to transfer audio/video from your smartphone to your computer. With support for resolutions up to 1080p and running ICS or JB on your phone, you can support the AAC format. :http://www.devstore.cn/code/info/559.html source code runTurn Android into a

, namely: SetTimeout (function (){ Input. focus (); Input. select (); }, 0 ); According to section 14.1 In JavaScript: The Definitive Guide 5th: In practice, setTimeout tells the browser to enable the setTimeout Function after it completes execution of the event processor for any current delay event and updates the current state of the document. In fact, this is a technique for skipping the tasks to be executed from the queue. Back to the previous example, when the JavaScript engine executes

This article mainly introduces jQuery's implementation of the drop-down list of two-level tab switching with latency. It involves the implementation techniques of jquery mouse events and dynamic conversion of page element styles, and has some reference value, for more information, see the following example. Share it with you for your reference. The details are as follows: This is a drop-down list menu with delayed effects based on jQuery, with animat

cycle: the period of the crystal oscillator. Take 12 MHz as an example. The clock cycle is 1/12000000 = 1/12us; Machine cycle: 1 machine cycle = 6 State cycles = 12 clock cycles = 1us; Command cycle: the time required by a single-chip microcomputer to execute a command is called the command cycle. The command cycle is based on the machine cycle. The machine cycles required for different commands are not necessarily the same (1-4 ), the single-chip microcomputer needs 1 us to execute a single-cy

(); } }}));} Start public void Startview () {Bitmap Bmp=bitmapfactory.decoderesource (getresources (), r.drawable.stop);//Open resource picture Start.setimagebitmap (BMP); Txtview01.settext ("Open serial port ..."); New Handler (). postdelayed (New Runnable () {public void run () {//execute the task tx Tview02.settext ("Open a ..."); }}, 500); New Handler (). postdelayed (New Runnable () {public void run () {//exeCute the Task Txtview03.se

Latency loading of front-end images Images displayed in the visible area of the browser cannot be flushed out in time, so that images in the visible area can be immediately loaded in, the image that is not in the visible area and needs to be displayed by scrolling through the scroll bar will be displayed after the image is rolled to the visible area. I was planning to write a blog about the detailed technology of front-end image delayed loading yester