Host Device Read-Ahead Control for Successive Files
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Solution Overview
Problem
Existing host devices are limited in their ability to efficiently perform read-ahead operations across multiple files, as they typically only read ahead within a single file or based on a fixed size designated by the kernel, which does not adapt to the sequential nature of read requests.
Innovation Solution
A host device and computing system that can perform read-ahead operations on successive files by determining if read requests for data in a first file are sequential, generating read commands to read ahead data in subsequent files, and adjusting the size of data to be read based on application-specific data size settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If read-ahead operation is performed only within a single file or based on fixed kernel-designated size, then the implementation is simple, but the read-ahead efficiency is limited
Solution Approach 1:
The patent implements dynamic read-ahead control by adjusting the read-ahead size based on the actual access patterns and file characteristics. The host device dynamically determines the read-ahead size for each file based on factors such as file size, access frequency, and sequential access patterns, rather than using a fixed kernel-designated size. This dynamic adjustment mechanism resolves the contradiction by making the read-ahead operation adaptable to different scenarios while maintaining reasonable system complexity.
Solution Approach 2:
The patent changes the parameter of read-ahead size from a fixed value to a variable that can be adjusted based on file characteristics and access patterns. By introducing parameters such as file access frequency, file size, and sequential access detection, the system can modify the read-ahead size parameter to optimize performance for different files and access scenarios, thereby improving read-ahead efficiency without excessive complexity.
2Productivity
If read-ahead size is increased to improve efficiency, then more data is pre-loaded into memory, but the memory usage and potential data waste increase
Solution Approach 1:
The patent applies local quality by customizing the read-ahead size for each individual file based on its specific characteristics rather than using a uniform size for all files. The system analyzes factors such as file size, access frequency, and access patterns to determine the appropriate read-ahead size for each file locally. This approach ensures that memory is allocated efficiently for each file's specific needs, improving data loading efficiency while avoiding excessive memory usage for files that don't require large pre-loading.
Solution Approach 2:
The patent implements partial read-ahead action by loading only the necessary portion of data ahead of time based on predicted access patterns. Rather than loading entire files or fixed large portions into memory, the system calculates and loads only the optimal amount of data that is likely to be accessed soon, thereby improving loading efficiency while controlling memory consumption through precise, partial pre-loading.
3Adaptability or versatility
If the host device monitors and determines successive read requests, then the read-ahead operation becomes more adaptive, but the processing overhead increases
Solution Approach 1:
The patent applies preliminary action by detecting and analyzing read request patterns in advance to determine whether successive read requests are occurring. The host device monitors read requests as they arrive and identifies sequential access patterns before initiating read-ahead operations. This preliminary detection mechanism enables the system to adaptively adjust read-ahead sizes based on actual access patterns while using efficient monitoring techniques that minimize processing overhead.
Data Source
AI summary
Provided herein is a method of operating a host device. The method may include, a determining that read requests for data in a first file are successive, in response to the determination that read requests are successive, generating a first read command that instructs second data to be read ahead, the second data being successive to first data, determining a logical address corresponding to the first read command, providing to a storage device the first read command and the logical address, determining whether a read-ahead request for the first file has been completed, based on a first file pointer and a first offset corresponding to a storage area within the storage device in which the first file is stored, and executing a read-ahead request for a second file in response to the determination that the read-ahead request for the first file has been completed.