DRAM-NVM hybrid memory predictor based on dynamic access

Abstract

The invention provides a DRAM-NVM (Dynamic Random Access Memory-Non-Volatile Memory) hybrid memory predictor based on dynamic access. The DRAM-NVM hybrid memory predictor comprises a prediction module and a self-adaptive updating module, the prediction module is used for mapping a memory address of the memory access request to the filter unit; the self-adaptive updating module is used for replaying the historical access information when the memory access behavior changes to obtain a latest updating rule so as to update the prediction state value according to the latest updating rule; and the prediction module is also used for predicting the hit state of the DRAM cache according to the prediction state value in the filter unit. By adopting the embodiment of the invention, accurate prediction is carried out at extremely low time and space cost, the change of the memory access behavior is dynamically adapted, and the prediction precision of future prediction is improved. Besides, by adapting to different access behaviors and dynamically selecting a serial access mode or a parallel access mode, the problem of access delay in the hierarchical hybrid storage system is effectively solved, so that the access performance of the whole memory is improved.

Description

technical field [0001] The present invention relates to the technical field of memory access, in particular to a DRAM-NVM hybrid memory predictor based on dynamic access. Background technique [0002] At present, DRAM (Dynamic Random Access Memory, dynamic random access memory) and NVM (Non-Volatile Memory, non-volatile memory) are being considered to combine to build a DRAM-NVM hybrid memory system to provide the same large memory capacity as NVM And high memory access speed comparable to DRAM. Among them, the hierarchical architecture is one of the most representative architectures of hybrid DRAM-NVM memory. It uses NVM as the main memory and caches NVM content through DRAM. In this architecture, DRAM and NVM usually work in serial access mode. The advantage of serial access mode is that it provides very fast data access on DRAM hits. However, when a DRAM miss occurs, accessing both DRAM and NVM at the same time results in longer access latency, preventing comparable pe...

AI Technical Summary

Problems solved by technology

[0003] In the hierarchical architecture of the hybrid memory system, the serial access mode and the parallel access mode have their own advantages and disadvantages. Therefore, using any one access mode alone will seriously affect the memory access performance.

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