Скачать или смотреть Simulating NVM Storage in Linux with C+ +

Discover how to effectively simulate NVM storage in Linux using C+ + by managing file-based memory. Accelerate your application storage and find practical tips here!
---
This video is based on the question https://stackoverflow.com/q/65027103/ asked by the user 'Mihai' ( https://stackoverflow.com/u/5275945/ ) and on the answer https://stackoverflow.com/a/67499703/ provided by the user 'Mihai' ( https://stackoverflow.com/u/5275945/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: NVM Storage Simulator in Linux/C+ +

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Simulating NVM Storage in Linux with C+ + : A How-To Guide

In the world of software development, transitioning an app from one environment to another can present numerous challenges. One common issue developers face is the need for storage solutions, especially when dealing with non-volatile memory (NVM) in Linux systems. If you're trying to port an application that previously relied on external NVM storage to run on Linux, and you're limited to only eMMC storage, don’t worry! This post will guide you through an effective method of simulating NVM storage using C+ + .

Understanding the Challenge

The key challenge faced in this scenario is the lack of access to proper NVM hardware. You’re tasked with simulating NVM storage while adhering to certain constraints:

Limited Data Size: You need to store about 5 MB of data.

Speed Requirements: You require data to be saved at a rate of approximately 20 KB/s.

Limited Access to Legacy Code: Due to not having access to the previous NVM implementation, the goal is to create a simple and functional solution.

With these requirements in mind, let's investigate a pragmatic approach to simulate NVM using file-based memory management.

Solution Overview

The solution involves leveraging file operations and memory mapping in Linux. Here’s a breakdown of the steps needed to achieve this:

Step 1: Create/Open a File

You begin by opening (or creating) a file in the file system that will serve as your simulated NVM. This is accomplished using the open function.

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Expand the File

Next, you need to expand this file to the desired size using lseek to move to the end of the file and then writing a termination character. This will allocate space in the file for your future data.

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Memory Mapping

After expanding the file, you can use memory mapping to access it directly in memory. By using mmap, you create a memory block that corresponds to the file you just created.

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Write and Read Operations

With the memory block mapped, you can now perform write and read operations as if you're interacting with real NVM storage.

Writing Data

To write data, simply use memcpy. This will enable you to place data into the correct memory address.

[[See Video to Reveal this Text or Code Snippet]]

Synchronization

To ensure that your changes are flushed and saved properly, you will need to synchronize the modified pages back to disk with msync.

[[See Video to Reveal this Text or Code Snippet]]

Reading Data

Finally, to read data back, you again use memcpy.

[[See Video to Reveal this Text or Code Snippet]]

Wrapping Up

Simulating NVM storage in Linux while using C+ + can seem daunting, but by approaching it methodically, leveraging file operations, and taking advantage of memory mapping, it becomes a manageable task. By following the steps outlined in this guide, you can effectively create a virtual NVM environment tailored to your application’s storage needs.

With this technique, you'll have a functional solution that fulfills your application's requirements without complicating the process or sacrificing performance.

Should you have any further questions or if you’d like to share your experiences, feel free to drop a comment below!