latency checker

In the MySQL world, Haproxy is often used as a software load balancer. Peter Boros explains how to use the Percona xtradb cluster (PXC) to set it up in a previous message. So it only sends the query to the applicable node. The same method can be used for general master-slave settings to read the load and spread across multiple nodes. However, with MySQL replication, another factor starts to work: replication latency. In this case, the mentioned Percon

threads of 99 delay data, where the main output of the information is concentrated in RPS and average latency, where the average latency is multiple threads concurrent request sever processing data after the average time of each thread. In addition there is a place to pay attention to, for scan words, a scan100, all our final statistics RPS is in the statistical number of good to 100 as the approximate RPS

external paging program FSBUF (used by the JFS2 file system). In addition, there are psbuf, which are fixed memory buffers used for I/O requests to paging space. In Figure 2, the vmstat-v command displays a value that is the average since bootstrap. Because the server may not reboot for a long time, be sure to take two snapshots in a few hours to check for changes in these values. Here, they grow fast and need to be tuned. I/O Latency In the vmsta

Label:Original: SQL Server 2012 alwayson--Specifies a data synchronization link to eliminate commit latency issues caused by network jitterEvent Cause: Recent research and development reaction, a database from 08 to 12 environment, the occurrence of write operation delay problem;Event Analysis: After troubleshooting problems such as system resource contention, preliminary analysis may be caused by network jitter that causes the synchronization mode Al

Label:To perform the show slave status from the server, you can view many of the synchronized parameters, and we need to pay special attention to the following parameters:The name of the primary server binary log file that is currently being read by the I/O thread in Master_log_file:slaveRead_master_log_pos: In the current primary server binary log, the I/O thread in slave has already read the locationRelay_log_file:sql the name of the trunk log file that the thread is currently reading and exec

Label:In a MySQL replication environment, we usually only judge the latency of the slave based on the value of the seconds_behind_master . This is acceptable in most cases, but is not accurate enough and should be considered for more factors. First, let's look at the state of slave: [Email protected] [(none)]> show slave status\g *************************** 1. Row *************************** Slave_io_ State:waiting for Master to send event * * * maste

This article mainly introduces how JavaScript achieves the sliding menu effect with the latency function. It involves the page style delay Conversion Function Based on mouse events and time functions. It has some reference value, for more information about how JS achieves the sliding menu with the latency function, see the examples in this article. Share it with you for your reference. The details are as fo

Configuration referenceHttps://github.com/simple-rtmp-server/srs/wiki/v2_CN_LowLatencyLatency Impact factorsEncoders: Different encoders (free or open source), the delay is also different.Streaming Media server: SRS2Streaming protocol: For example: RTMP is real-time high, http_flv is also high-real-time, HLS is not, the official said 60s can tolerate ...Player: VLC is slower than Ffplayer and player.Network: Of course, it is also related to the network, and the relationship is relatively large.V

day in 365 days a year? After thinking for a while, he expressed with Extreme suspicion that it was impossible and felt like a day, and he was eager to remember his ability to remember each day. He is eager to remember that every day is a enrichment, reflection, and accumulation. When I asked him to write logs to record his own day, he hesitated and unknowingly explained some objective obstacles. When asked him the root cause, he said he was not patient. I clearly know that things are "correct"

This article mainly introduces jquery's method of implementing the TAB tab mouse with a latency effect, which can achieve the delayed loading effect of the TAB, involving jquery mouse events and related usage techniques of the latency function, for more information, see the example in this article. Share it with you for your reference. The details are as follows: If you want to execute some functions after

Comparison and summarization of several delayed execution methods in iOS, ios latency This article lists four methods for delaying the execution of a function and their differences. If the latency is 1 second, execute the following method. - (void)delayMethod{ NSLog(@"execute");} 1. performSelector Method [self performSelector:@selector(delayMethod) withObject:nil afterDelay:1.0f]; This method must be

The design prototype of many standard query operators returns an ienumerable CodeWhen the row is executed, a sequence is returned. In fact, an object is returned. when the object is enumerated (such as foreach), an element is generated from the ienumerable A small example proves the existence of "delayed query" Int [] intarray = new int [] {0, 1, 2, 3}; ienumerable The two output results are: 0, 1, 2, 3, 4, 1, 2, 3. it can be seen that the query operation will be performed only when items i

When there are a large number of images on the page, the download may cause page latency. The following describes a solution to this problem: Function Regimg ( E , SRC ){ If ( ! Window . Imghash ) Window . Imghash = New Object () ; VaR A = Imghash [ SRC ] ; E . Onerror = Null ; If ( A = Null ) { E . Style . Display = " None "

From: http://www.cnblogs.com/Bung/archive/2011/05/17/2048867.html // Latency function: method 1 procedure delay(msecs:integer); var Tick: DWord; Event: THandle; begin Event := CreateEvent(nil, False, False, nil); try Tick := GetTickCount + DWord(msecs); while (msecs > 0) and (MsgWaitForMultipleObjects(1, Event, False, msecs, QS_ALLINPUT) do begin Application.ProcessMessages; msecs := Tick - GetTickcount; end; finally CloseHandle(Event); end;

File_get_contents high latency usage, file_get_contents. File_get_contents high-latency usage. file_get_contents first solves the super-time problem of file_get_contents. after the super-time response, it performs a failover like settimeout in js, when the quota exceeds the file_get_contents high quota usage, file_get_contents First, solve the super-time problem of file_get_contents. after the super-time i

This article mainly introduces a case of troubleshooting slave database latency in MySQL, aiming at the high CPU usage in the slave database without service status, for more information about how to send a ticket to a customer today, if the slave database has no business, one core of the mysqld cpu occupies 100%. query the slow query of the master database and there are no SQL statements about writing. It can be said that the typical single-process re

This article mainly introduces file_get_contents high-latency usage in PHP, including timeout restrictions and POST implementation usage. For more information, see the following example to describe file_get_contents advanced usage in PHP, share it with you for your reference. The specific analysis is as follows: First, solve the problem of file_get_contents timeout. After a timeout error is returned, an attempt is made like settimeout in js. after th

US-level latency function in WinCE Author: Lai yuping (auly) aulyp@163.com in wince 5.0 1us latency, system API . The following is a verified function that is very useful for communication protocols. Void delay_us (int n) { Large_integer litmp; Longlong qpart1, qpart2; Double dfminus, dffreq, dftim; Queryperformancefrequency ( litmp ); Dffreq = (double) litmp.

This goes back to the beginning of 2007. Apple, on the eve of the launch of its first iPhone, encountered a problem-the site was designed for large-screen devices. So Apple's engineers made some promises to tackle the problem of the IPhone's small screen browsing desktop-side site. The most famous of these is the double-click Zoom (double tap to zoom). This is also the main reason for the 300 millisecond delay mentioned above.When the user taps the screen one time, the browser does not immediate

Codeforces Round #312 (Div. 2) E. A Simple Task line segment tree latency tag E. A Simple TaskTime limit per test5 secondsMemory limit per test512 megabytesInputstandard inputOutputstandard outputThis task is very simple. given a string S of length n and q queries each query is on the format I j k which means sort the substring consisting of the characters from I to j in non-decreasing order if k limit = Limit 1 or in non-increasing order if k Limit =