Precisely Measuring Time Duration in Go
While most applications use the standard time package to measure time duration, it's crucial to address its limitations to obtain accurate results. time.Now() relies on the system time, which can be affected by time zone changes and clock synchronization with NTP servers.
To overcome these challenges, Go provides a "monotonic clock" that is unaffected by external time adjustments. Starting with Go 1.9, durations in Go automatically leverage this monotonic clock.
This means that the following code always computes a positive elapsed time of approximately 20 milliseconds, even if the wall clock changes during the timed operation:
start := time.Now() ... operation that takes 20 milliseconds ... t := time.Now() elapsed := t.Sub(start)
Other idioms like time.Since(start), time.Until(deadline), and time.Now().Before(deadline) are also resilient against wall clock resets.
Therefore, to precisely measure execution time in Go, simply use the time package's time.Now() and time.Sub() functions. These functions now ensure that elapsed time measurements are consistent and unaffected by system clock adjustments.
The above is the detailed content of How Can I Precisely Measure Execution Time in Go?. For more information, please follow other related articles on the PHP Chinese website!

Goisastrongchoiceforprojectsneedingsimplicity,performance,andconcurrency,butitmaylackinadvancedfeaturesandecosystemmaturity.1)Go'ssyntaxissimpleandeasytolearn,leadingtofewerbugsandmoremaintainablecode,thoughitlacksfeatureslikemethodoverloading.2)Itpe

Go'sinitfunctionandJava'sstaticinitializersbothservetosetupenvironmentsbeforethemainfunction,buttheydifferinexecutionandcontrol.Go'sinitissimpleandautomatic,suitableforbasicsetupsbutcanleadtocomplexityifoverused.Java'sstaticinitializersoffermorecontr

ThecommonusecasesfortheinitfunctioninGoare:1)loadingconfigurationfilesbeforethemainprogramstarts,2)initializingglobalvariables,and3)runningpre-checksorvalidationsbeforetheprogramproceeds.Theinitfunctionisautomaticallycalledbeforethemainfunction,makin

ChannelsarecrucialinGoforenablingsafeandefficientcommunicationbetweengoroutines.Theyfacilitatesynchronizationandmanagegoroutinelifecycle,essentialforconcurrentprogramming.Channelsallowsendingandreceivingvalues,actassignalsforsynchronization,andsuppor

In Go, errors can be wrapped and context can be added via errors.Wrap and errors.Unwrap methods. 1) Using the new feature of the errors package, you can add context information during error propagation. 2) Help locate the problem by wrapping errors through fmt.Errorf and %w. 3) Custom error types can create more semantic errors and enhance the expressive ability of error handling.

Gooffersrobustfeaturesforsecurecoding,butdevelopersmustimplementsecuritybestpracticeseffectively.1)UseGo'scryptopackageforsecuredatahandling.2)Manageconcurrencywithsynchronizationprimitivestopreventraceconditions.3)SanitizeexternalinputstoavoidSQLinj

Go's error interface is defined as typeerrorinterface{Error()string}, allowing any type that implements the Error() method to be considered an error. The steps for use are as follows: 1. Basically check and log errors, such as iferr!=nil{log.Printf("Anerroroccurred:%v",err)return}. 2. Create a custom error type to provide more information, such as typeMyErrorstruct{MsgstringDetailstring}. 3. Use error wrappers (since Go1.13) to add context without losing the original error message,

ToeffectivelyhandleerrorsinconcurrentGoprograms,usechannelstocommunicateerrors,implementerrorwatchers,considertimeouts,usebufferedchannels,andprovideclearerrormessages.1)Usechannelstopasserrorsfromgoroutinestothemainfunction.2)Implementanerrorwatcher


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SublimeText3 English version
Recommended: Win version, supports code prompts!

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

SublimeText3 Chinese version
Chinese version, very easy to use

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
