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Heterogeneous memory management combined with server virtualization in datacenters is expected to increase the software and OS management complexity. State-of-the-art solutions rely exclusively on the hypervisor (VMM) for expensive page hotness tracking and migrations, limiting the benefits from heterogeneity. To address this, we design HeteroOS, a novel application-transparent OS-level solution for...
In order to bridge the gap between the applications' I/O needs on future exascale platforms, and thecapabilities of conventional memory and storage technologies, HPC system designs started integrating components based onemerging non-volatile memory technologies. Non-volatile memory (NVRAM) provides persistent storage at close to memoryspeeds, with good capacity scaling, leading to opportunitiesto...
Next generation byte addressable nonvolatile memory (NVM) technologies like PCM are attractive for end-user devices as they offer memory scalability as well as fast persistent storage. In such environments, NVM’s limitations of slow writes and high write energy are magnified for applications that need atomic, consistent, isolated and durable (ACID) updates. This is because, for satisfying correctness...
Next generation byte addressable nonvolatile memories (NVMs) such as PCM, Memristor, and 3D X-Point are attractive solutions for mobile and other end-user devices, as they offer memory scalability as well as fast persistent storage. However, NVM's limitations of slow writes and high write energy are magnified for applications that require atomic, consistent, isolated and durable (ACID) persistence...
Moving toward exascale, the number of GPUs in HPC machines is bound to increase, and applications will spend increasing amounts of time running on those GPU devices. While GPU usage has already led to substantial speedup for HPC codes, their failure rates due to overheating are at least 10 times higher than those seen for the CPUs now commonly used on HPC machines. This makes it increasingly important...
This paper explores the performance implications of using future byte addressable non-volatile memory (NVM) like PCM in end client devices. We explore how to obtain dual benefits - increased capacity and faster persistence - with low overhead and cost. Specifically, while increasing memory capacity can be gained by treating NVM as virtual memory, its use of persistent data storage incurs high consistency...
Rapid check pointing will remain key functionality for next generation high end machines. This paper explores the use of node-local nonvolatile memories (NVM) such as phase-change memory, to provide frequent, low overhead checkpoints. By adapting existing multi-level checkpoint techniques, we devise new methods, termed NVM-checkpoints, that efficiently store checkpoints on both local and remote node...
A well-known problem for large scale cloud applications is how to scale their I/O performance. While next generation storage class memories like phase change memory and Memristors offer potential for high I/O bandwidths, if left unchecked, the raw volumes and rates of I/O already present in current cloud applications can quickly overwhelm future I/O infrastructures. This fact is motivating research...
Mobile devices, net books and laptops, and powerful home PCs are creating ever-growing computational capacity at the periphery of the Internet, and this capacity is supporting an increasingly rich set of services, including media-rich entertainment and social networks, gaming, home security applications, flexible data access and storage, and others. Such 'at the edge' capacity raises the question,...
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