Data reading method, device and system

Abstract

The embodiment of the invention discloses a data reading method, device and system. The data reading method comprises the steps of: inquiring a data cache module according to a received reading request, when data of the reading request is not searched in the data cache module, obtaining the required data from a storage module according to the reading request, wherein the reading request comprises a front position and a length of the required data; obtaining a final position of the required data according to the first position and the length of the data required by the reading request; and inquiring a position of a record in a skip historical record module before skip according to the final position of the request data, if the position is searched, sending a position after skip, corresponding to the position before skip, in the skip historical record module to a pre-fetching module so that the pre-fetching module pre-fetches the data from the storage module according to the position after skip and caches the data in the data cache module. According to the invention, the problem of frame loss caused by overlong data reading time can be effectively avoided.

Description

technical field [0001] The embodiments of the present invention relate to computer technology, and in particular to a data reading method, device and system. Background technique [0002] In video editing applications, the read delay of the video data storage device has an important impact on the video editing software, that is, if the storage device returns data to the video editing software read request of the video editing workstation for too long, it will cause Video editing software drops frames because it cannot read data. [0003] In order to reduce the frame loss caused by the long response time of the storage device, the storage device generally adopts the prefetch method, that is, when the read request from the video editing workstation has not yet arrived, the storage device reads the data into its memory buffer in advance. The requested data can be returned to the video editing workstation from the memory buffer immediately after the request arrives. figure 1 I...

AI Technical Summary

Problems solved by technology

[0004] In the data reading of the above-mentioned storage device, when the data of the next read request of the video editing workstation is exactly the data cached in the data cache module, it can be directly read from the data cache module. However, when the data of the next read request is not When the data is cached in the data cache module, the read interface module still cannot hit from the cache, and still needs to read data from the storage medium, resulting in a large delay in reading data, that is, frame loss will still occur

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