


Why is downloading in memory slower than downloading in the file system from aws s3?
Why is downloading in memory slower than downloading in the file system from AWS S3? When downloading files, we usually choose to download from an AWS S3 bucket to the local file system. However, sometimes we find that using the in-memory download method is slower than downloading directly from S3 to the file system. This is because downloading in memory involves some extra steps and resource consumption. First, in-memory downloads require reading the file contents into memory and then writing them to the file system. This process involves additional memory operations and IO operations, which will cause the download speed to be slower than downloading directly from S3 to the file system. In addition, in-memory downloads may also be affected by memory limitations. When the downloaded files are large, it may cause insufficient memory problems, thereby affecting the download speed. Therefore, when choosing a download method, you need to weigh the pros and cons according to the specific situation and choose the most suitable method for downloading.
Question content
I am using aws gosdk to download from a certain bucket. The following are two implementations for download
- Download to file
func (a *awsclient) downloadtofile(ctx context.context, objectkey string) (string, error) { params := &awss3.getobjectinput{ bucket: aws.string(a.bucket), key: aws.string(objectkey), } downloadpath := "some/valid/path" f, err := os.create(downloadpath) defer f.close() _, err = a.downloader.download(ctx, f, params) return downloadpath, err }
- Download to memory
func (a *AwsClient) DownloadToMemory(ctx context.Context, objectKey string) (string, error) { params := &awsS3.GetObjectInput{ Bucket: aws.String(a.bucket), Key: aws.String(objectKey), } buffer := manager.NewWriteAtBuffer([]byte{}) _, err = a.downloader.Download(ctx, buffer, params) return buffer.Bytes(), err }
For a 100 mb file, it takes 30 seconds to download to memory and only 8 seconds to download to the file system. My expectation is that memory downloads should be much faster. My system (apple m1, ventura, 8gb ram) has enough ram available so this is not an issue. Can anyone help me understand this behavior?
Solution
Downloading large S3 objects into dynamic buffers is very inefficient. The buffer was reallocated multiple times to handle 100M of data and multiple download threads. Memory reallocation requires a lot of CPU time.
Try to allocate 100M at the beginning instead of using null byte slices.
If the object size is unknown, you can use S3.HeadObject to get the object length in real time.
The above is the detailed content of Why is downloading in memory slower than downloading in the file system from aws s3?. For more information, please follow other related articles on the PHP Chinese website!

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

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

Since its inception in 2009, Bitcoin has become a leader in the cryptocurrency world and its price has experienced huge fluctuations. To provide a comprehensive historical overview, this article compiles Bitcoin price data from 2009 to 2025, covering major market events, changes in market sentiment, and important factors influencing price movements.

1. First, right-click on the blank space of the taskbar at the bottom of Windows 11 and select [Taskbar Settings]. 2. Find [taskbarcorneroverflow] on the right in the taskbar settings. 3. Then find [clock] or [Clock] above it and select to turn it on. Method 2: 1. Press the keyboard shortcut [win+r] to call up run, enter [regedit] and press Enter to confirm. 2. Open the registry editor, find [HKEY_CURRENT_USERControlPanel] in it, and delete it. 3. After deletion, restart the computer and you will be prompted for configuration. When you return to the system, the time will be displayed.

Answer: The following community forums and discussion groups are available for Java functional programming questions: StackOverflow: The world's largest programming Q&A website with a community of Java functional programming experts. JavaFunctionalProgramming: A community forum focused on Java functional programming, providing discussions on concepts, language features, and best practices. Redditr/functionaljava: A subreddit focused on functional programming in Java, focusing on tools, libraries, and technologies. Discord: JavaFunctional Programming: Discord service that provides real-time discussion, code sharing and collaboration

How do I use other people's Python code? Find code repositories: Find the code you need on platforms like PyPI and GitHub. Installation code: Use pip or clone the GitHub repository to install. Import modules: Use the import statement in your script to import installed modules. Working with code: Access functions and classes in modules. (Optional) Adapt the code: Modify the code as needed to fit your project.

What should I do if the time on my win11 computer is always wrong? We all set the time or calendar when using win11 system, but many users are asking that the computer time is always wrong, so what is going on? Users can directly click on the taskbar below, and then find taskbarcorneroverflow to set it up. Let this site introduce to users in detail how to adjust the time error on Win11 computers. How to adjust the computer time error in Windows 11. Method 1: 1. We first right-click on the blank space of the taskbar below and select Taskbar Settings. Method 2: 1. Press the keyboard shortcut win+r to call up run, enter regedit and press Enter to confirm.

Common exception types and their repair measures in Java function development During the development of Java functions, various exceptions may be encountered, which affect the correct execution of the function. The following are common exception types and their repair measures: 1. NullPointerException Description: Thrown when accessing an object that has not been initialized. Fix: Make sure you check the object for non-null before using it. Sample code: try{Stringname=null;System.out.println(name.length());}catch(NullPointerExceptione){

overflow is a property of CSS that is used to control the display mode of element content when it exceeds the container. Available values include: visible: the content is visible, the overflow container is hidden: the overflow content is cut scroll: the scroll bar is displayed to view the overflow content auto: the browser automatically determines Whether to display the scroll bar inherit: inherit the overflow attribute of the parent element

As a world-renowned short video platform, Douyin has a huge user base and content creators. However, as the platform rules are constantly updated and improved, some users may encounter account bans. This has raised public questions about the transparency and fairness of platform management. This article will discuss the issue of Douyin account bans and whether users have ways to appeal after their accounts are banned. There may be many reasons for being banned on the Douyin platform, including but not limited to illegal content, violation of platform regulations, infringement of other people's rights, etc. In order to maintain the order of the platform and the interests of users, Douyin has set up a series of rules and review mechanisms. When some users violate the rules, their accounts may be banned. However, some users may question or be dissatisfied with the reasons for the ban
