what microsecond

Example of script execution time using microsecond in PHP, and microsecond in php In PHP, most time formats are expressed in UNIX timestamps, while UNIX timestamps are measured in seconds with the smallest unit. This is not accurate enough for some

Article go to: Http://www.codeproject.com/Articles/98346/Microsecond-and-Millisecond-NET-TimerIntroductionAnyone who have used the. NET System.Timers.Timer class for low interval times would realise that it does don't offer a very h IgH resolution.

In C + +, it is often necessary to count performance information by timing, and to analyze performance bottlenecks through statistical time-consuming information, which can often be sufficient for millisecond-level time statistics, but in the case

1. Why write down microsecond latency in WindowsIn the efficiency of testing memcpy in the previous implementation of the memcpy () function and the process summary, the copy efficiency of the test time is in the microsecond level and requires a

This article mainly introduces the example of using the microsecond computing script execution time in PHP. This article first explains some knowledge about the microtime function and then provides a class for calculating the script running time,

CPU speed (MHz) and high precision latency (microsecond) (Browsing 20979 times) Victor Chen, (C ++ fans) I. High-Precision latency is the basis of CPU speed measurementWindows has a very high-precision timer in microseconds, but different systems

! Microsecond-Level TimersExactTimer.h#pragma once #include BOOL readdwordkey in hkey hrootkey in lpctstr lpsubkey in lpctstr lpkey, out dword & dwvalue) { HKEY HK; if (error_success!=regopenkey(hrootkey, lpsubkey,&HK))

#include int gettimeofday (struct TIMEVAL*TV, struct timezone *tz); The parameter TV is the structure that holds the result of the time, and the parameter tz is used to save the time zone result: struct timezone{ int tz_minuteswest;/* GMT to the

Picosecond, Symbol PS (English: picosecond).1 pi seconds equals one-zero seconds (10-12 seconds)1,000 picosecond = 1 nanoseconds ns1,000,000 picosecond = 1 microseconds μs1,000,000,000 picosecond = 1 msec μs1,000,000,000,000 picosecond = 1 seconds

1, millisecond level Use GetTickCount () to get the number of milliseconds that the system started #include usingnamespace std; int Main () { DWORD start// Gets the number of milliseconds to Sleep (+); Endl;

In the industrial production control system, there are many operations that need to be done regularly, such as: Timing display the current time, periodically refresh the progress bar on the screen, the host computer timing down the machine to send

Sometimes it is necessary to calculate the execution time of the command, which can be used, although the time command can be accurate to the millisecond level, but it is not possible to calculate the execution times of a heap of commands. You can

Get microsecond time in Linux with C language1. Data structureint gettimeofday (structstruct timezone *tz);The parameter TV is the structure that holds the result of the acquisition time, and the parameter tz is used to save the time zone

microtime-returns the current Unix timestamp and microseconds description Mixed Microtime ([bool $get _as_float]) Microtime () The current Unix timestamp and the number of microseconds. This function is only available under an operating system

Explanation: High-Precision latency is the basis of CPU speed measurement. in windows, there is a very high-precision timer with the precision in microseconds. However, the timer frequency varies with different systems, this frequency may be related

Description: Call WSAStartup to initialize the Winsock before calling the functionvoiduSleep (uint32_t usec) {structtimeval timeout; Fd_set FDS; Fd_zero (&FDS); int32_t FD= Socket (Af_inet, SOCK_DGRAM,0); Fd_set (FD,&FDS); Timeout.tv_sec= USEC/100

Php generates uuid and php image Upload microsecond named file name Function guid (){ If (function_exists ('com _ create_guid ')){ Return com_create_guid (); } Else { Mt_srand (double) microtime () * 1000

From: http://www.cvchina.info/2010/02/10/2-3-us-feature-point-match/   Demo Video   This is cvpr2009The best demo. From Cambridge University. Match a featurePoint is only 2.3 microseconds. It is microsecond, not millisecond! A plane image is

/* * @FileName: TEST_SLEEP.C * @Author: WZJ * @Brief: * * * @History: * * @Date: February 07, 2012 Tuesday 22:20:00 * */ #include #include #include #include #include #include #include #include #include

This article mainly introduces the datetime module in the python time module. The interface of the datetime module is more intuitive and easier to call, if you want to know about the datetime module, you can refer to Python to provide multiple built-