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Phase change memory (PCM) has emerged as a promising non-volatile memory technology. Multi-level cell (MLC) PCM, while effectively reducing per bit fabrication cost, suffers from resistance drift based soft errors. It is challenging to construct reliable MLC chips that achieve high performance, high storage density, and low energy consumption simultaneously. In this paper, we propose ReadDuo, a fast...
Journaling file systems have been widely used where data consistency must be assured. However, we observed that the overhead of journaling can cause up to 48.2% performance drop under certain kinds of workloads. On the other hand, the emerging high-performance, byte-addressable Non-volatile Memory (NVM) has the potential to minimize such overhead by being used as the journal device. The traditional...
The emerging Phase Change Memory (PCM) has many advantages such as good scalability and low leakage. MLC (Multi-Level Cell) PCM further extends the benefits by storing two or more bits per cell and thus reducing the per bit cost. However, adopting MLC PCM in main memory often leads to long write latency, high energy consumption, and degraded performance. In this paper, we propose TriState-SET, a proactive-SET...
Constructing a highly scalable and dense main memory subsystem with large access bandwidth has become a major challenge for modern computing systems. Traditional memory technologies, like DRAM and NAND Flash, suffer from either poor scalability or limited access bandwidth. Recent studies have identified emerging Phase Change Memory (PCM) as one of the most promising low power main memory technology...
The emerging Phase Change Memory (PCM), while having many advantages, suffers from slow write operations. This is mainly due to its asymmetric write characteristic, i.e., for two types of write operations of PCM, SET is much slower than RESET. Recent study has shown that proactively setting dirty memory lines to all ‘1’s can enable RESET-only writes when these lines are written back from the cache,...
Phase change memory (PCM) recently has emerged as a promising technology to meet the fast growing demand for large capacity memory in modern computer systems. In particular, multi-level cell (MLC) PCM that stores multiple bits in a single cell, offers high density with low per-byte fabrication cost. However, despite many advantages, such as good scalability and low leakage, PCM suffers from exceptionally...
Phase Change Memory (PCM) recently has emerged as a promising memory technology. However it suffers from limited write endurance. Recent studies have shown that the lifetime of PCM cells heavily depends on the RESET energy. Typically, larger than optimal RESET current is employed to accommodate process variation. This leads to over-programming of cells, and dramatically-shortened lifetime. This paper...
With wide adoption of chip multiprocessors (CMPs) in modern computers, there is an increasing demand for large capacity main memory systems. The emerging PCM (Phase Change Memory) technology has unique power and scalability advantages and is regarded as a promising candidate among new memory technologies. When scheduling a mix of applications of different priority levels, it is often important to...
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