Content-Centric Networking is a novel future network architecture that attracts increasing research interests in recent years. In-network caching has been regarded as a prominent feature of Content-Centric Networking ...Content-Centric Networking is a novel future network architecture that attracts increasing research interests in recent years. In-network caching has been regarded as a prominent feature of Content-Centric Networking since it is able to reduce the network traffic, alleviate the server bottleneck and decrease the user access latency. However, the CCN default caching scheme results in a high caching redundancy, causing an urgent need for an efficient caching scheme. To address this issue, we propose a novel implicit cooperative caching scheme to efficiently reduce the caching redundancy and improve the cache resources utilization. The simulation results show that our design achieves a higher hit ratio and a shorter cache hit distance in comparison with the other typical caching schemes.展开更多
In cloud computing data centers,containerized tasks are regularly scheduled from one physical host to another due to resource management requirements such as handling machine failures,rebalancing server resources,and ...In cloud computing data centers,containerized tasks are regularly scheduled from one physical host to another due to resource management requirements such as handling machine failures,rebalancing server resources,and upgrading/scaling applications.After the container running in the source host is scheduled to the target host,it suffers from I/O performance degradation until the DRAM buffer is fully rebuilt.However,migrating the DRAM buffer from the source host to the target host could also introduce intolerable downtime of containerized tasks.Especially,as the DRAM buffer capacity of the application already increases to about dozens or hundreds of GB,the cost of downtime due to container migration becomes unacceptable.Many researchers have devoted themselves to developing an effective DRAM buffer warm-up scheme to avoid the cold bootstrap issue after container migration,such as pre-copy and post-copy schemes.However,the cold bootstrap and large-capacity buffer migration issues of container scheduling are still an open research problem.In this paper,motivated by the observation that the DRAM buffer is always flushed to the storage backend before starting the container in the target host,we proposed a scheme named ZeroCopy to utilize the file system to assist the DRAM buffer migration.ZeroCopy traverses the files in the DRAM buffer and flags these files when these files are flushed into the file system,and reloads these files into DRAM after starting the container in the target host.By this scheme,the container migration procedure does not require migrating data buffers and can start within an acceptable time.We conduct a series of experiments with public cloud traces to measure several key metrics on container migration.The results show that ZeroCopy outperforms these existing schemes.The average data transmission volume is reduced by about 6.25 times compared with state-of-the-art,and the downtime of container migration is also reduced by 31.8%.展开更多
Godson-3 is the latest generation of Godson microprocessor family. It takes a scalable multi-core architecture with hardware support for accelerating applications including X86 emulation and signal processing. This pa...Godson-3 is the latest generation of Godson microprocessor family. It takes a scalable multi-core architecture with hardware support for accelerating applications including X86 emulation and signal processing. This paper introduces the system architecture of Godson-3 from various aspects including system scalability, organization of memory hierarchy, network-on-chip, inter-chip connection and I/O subsystem.展开更多
基金supported in part by the 973 Program under Grant No.2013CB329100in part by NSFC under Grant No.61422101,62171200,and 62132017+1 种基金in part by the Ph.D. Programs Foundation of MOE of China under Grant No.20130009110014in part by the Fundamental Research Funds for the Central Universities under Grant No.2016JBZ002
文摘Content-Centric Networking is a novel future network architecture that attracts increasing research interests in recent years. In-network caching has been regarded as a prominent feature of Content-Centric Networking since it is able to reduce the network traffic, alleviate the server bottleneck and decrease the user access latency. However, the CCN default caching scheme results in a high caching redundancy, causing an urgent need for an efficient caching scheme. To address this issue, we propose a novel implicit cooperative caching scheme to efficiently reduce the caching redundancy and improve the cache resources utilization. The simulation results show that our design achieves a higher hit ratio and a shorter cache hit distance in comparison with the other typical caching schemes.
基金supported by the National Natural Science Foundation of China under Grant No.62202368.
文摘In cloud computing data centers,containerized tasks are regularly scheduled from one physical host to another due to resource management requirements such as handling machine failures,rebalancing server resources,and upgrading/scaling applications.After the container running in the source host is scheduled to the target host,it suffers from I/O performance degradation until the DRAM buffer is fully rebuilt.However,migrating the DRAM buffer from the source host to the target host could also introduce intolerable downtime of containerized tasks.Especially,as the DRAM buffer capacity of the application already increases to about dozens or hundreds of GB,the cost of downtime due to container migration becomes unacceptable.Many researchers have devoted themselves to developing an effective DRAM buffer warm-up scheme to avoid the cold bootstrap issue after container migration,such as pre-copy and post-copy schemes.However,the cold bootstrap and large-capacity buffer migration issues of container scheduling are still an open research problem.In this paper,motivated by the observation that the DRAM buffer is always flushed to the storage backend before starting the container in the target host,we proposed a scheme named ZeroCopy to utilize the file system to assist the DRAM buffer migration.ZeroCopy traverses the files in the DRAM buffer and flags these files when these files are flushed into the file system,and reloads these files into DRAM after starting the container in the target host.By this scheme,the container migration procedure does not require migrating data buffers and can start within an acceptable time.We conduct a series of experiments with public cloud traces to measure several key metrics on container migration.The results show that ZeroCopy outperforms these existing schemes.The average data transmission volume is reduced by about 6.25 times compared with state-of-the-art,and the downtime of container migration is also reduced by 31.8%.
基金Supported by the National High Technology Development 863 Program of China under Grant No.2008AA010901the National Natural Science Foundation of China under Grant Nos.60736012 and 60673146the National Basic Research 973 Program of China under Grant No.2005CB321601.
文摘Godson-3 is the latest generation of Godson microprocessor family. It takes a scalable multi-core architecture with hardware support for accelerating applications including X86 emulation and signal processing. This paper introduces the system architecture of Godson-3 from various aspects including system scalability, organization of memory hierarchy, network-on-chip, inter-chip connection and I/O subsystem.
