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Machine Hardware Environment:Cpu:intel (R) Xeon (r) CPU e3-1230 v3 @ 3.30GHz 4 Coremem:32gSsd:intel Ssdsc2bp480g4SATA hdd:2*500g LVMInstallation of Sysbench 0.5:LP: ~sysbench-developers/sysbench/0.5 sysbench#cd sysbench/#.

--Query for the slowest SQLSELECT * FROM (Select Parsing_user_id,executions,sortsCommand_type,disk_reads,sql_text from V$sqlarea ORDER BY disk_reads Desc) Where rownum--Query corresponding sessionSelect SE. Sid,se. Serial#,pr. SPID,SE. Username,se.

MySQL templates, which are used online in this address http://mysql-cacti-templates.googlecode.com has not been accessedGoogle found this URL:Introduction Cheat:

I. Three time Structures Time_t: // seconds   Struct timeval { Long TV _sec;/* seconds */ Long TV _usec;/* microseconds */ };   Struct timespec { Time_t TV _sec;/* seconds */ Long TV _nsec;/* nanoseconds */ };Ii. setitimer () In the

Original http://blog.csdn.net/shagoo/article/details/6396089[[email protected] PHP]#VI server_one.phpPHPSet_time_limit(0);classSocketserver {Private Static $socket; Public function__construct ($port) { Global $errno,$errstr; if($port) {

I. High-performance indicators of the site from different perspectives, and its Optimization 1, the developer's perspective the developers focus on the performance of the application itself and its related subsystems, including response latency,

In the industrial production control system, there are many operations that need to be completed regularly, such as timing display current time, timed to refresh the screen progress bar, the host computer timed down to send commands and data

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, therefore, xhprof is

Sysbench multi-thread performance testing tool bitsCN.com recently used sysbench for many performance tests. it also summarizes its features and usage and precautions. Sysbench is a multi-thread performance testing tool that can perform performance

Linux embedded system and how to develop your own embedded system-Linux general technology-Linux programming and kernel information. The following is a detailed description. Most Linux systems run on PC platforms, but Linux is also very stable as an

C # multithreading practices-synchronization system, Lock Statement (that is, Monitor. enter/Monitor. exit) is usually used when a thread synchronizes exclusive access to a piece of code or resources, however, it is complicated to implement

Author: zhanhailiang Date: 2014-12-021.INFOinfo command returns server-related information, including: server: GeneralinformationabouttheRedisserverclients: Clientconnectionssectionmemory: Memoryconsumptionrelatedinformationpersistence:

V $ sqltext: the complete SQL statement is stored, and the SQL statement is segmented. v $ sqlarea: the stored SQL statement and related information, such as the cumulative number of executions, logical reads, statistical information such as

1, pass any number of function parameters We're in. NET or Java programming, the number of general function parameters is fixed, but PHP allows you to use any number of parameters. The following example shows you the default parameters for PHP

Some processes require the ability to inform the kernel beforehand, so that once the kernel discovers that one or more of the I/O conditions specified by the process are ready (that is, the input is ready to be read, or the descriptor is able to

Tag: CTI while problem 16px code card unit returns insert data1. IntroductionThe rational use of the thread pool can bring three Benefits.First: Reduce Resource Consumption. reduce the consumption caused by thread creation and destruction by reusing

There's a lot of ways to check it online. 1, MD5 (Time (). Mt_rand (1,1000000)); This method has a certain probability that there will be repetition 2. PHP built-in function uniqid () The Uniqid () function generates a unique ID based on the

A class was written to test the execution time of the target function. The following is the definition code for the class: Copy the Code code as follows: /*** Class Efficiencytester* Efficiency tester, test function run time* @version 1.0 2013.04

Developers who have done PHP development should be aware that PHP has a lot of built-in features, mastered them, can help you in the development of PHP more handy, this article will share 8 development of the necessary PHP features, all very

Tanaka, a researcher at Facebook Ai Group, updated an article in a column that detailed an analysis of Alphago's paper published in the journal Nature, which he said Alphago the entire system had a professional level even on a single machine, and