Due to the growing demand of flexible resource management for cloud computing services, researches on live virtual
machine migration have attained more and more attention. Live migration of virtual machine across different hosts has
been a powerful tool to facilitate system maintenance, load balancing, fault tolerance and so on. In this paper, we use a
measurement-based approach to compare the performance of two major live migration technologies under certain network
conditions, i.e., VMotion and XenMotion. The results show that VMotion generates much less data transferred than
XenMotion when migrating identical VMs. However, in network with moderate packet loss and delay, which are typical in
a VPN (virtual private network) scenario used to connect the data centers, XenMotion outperforms VMotion in total
migration time. We hope that this study can be helpful in choosing suitable virtualization environments for data center
administrators and optimizing existing live migration mechanisms.
A generation algorithm is used to optimize a tunable optical wavelength selection switch (WSS) which is based on a cascaded silicon microring resonator. This method can help us find the optimal inter-ring coupling coefficients which can lead to smaller ripple and better wavelength selectivity over a predefined pass band range. In this paper, we validate this method by a real design and report the results of several, such GA-based WSS optimization. The results show that the GA method performs well even under the limit of physical properties of a silicon ring resonator.
Ultralow-latency and less power consumption have become necessary in multi-processor
interconnection network on chip, photonic interconnection as a solution to meet above
requirement, provides high performance interconnection on chip. But the photonic network on
chip architecture design and performance is limited because photonic interconnection hasn't
buffer, photonic network architecture must be designed to relieve this limitation. In this paper,
we present a multi-channel photonic network on chip architecture employing deflection routing,
optical data packets can inject/eject from processor core by four channels at the same time.
Simulation result shows this network architecture has 60% latency decrease compared to
generic photonic network on chip, and the photonic network architecture is only consume 7%
power of the electronic interconnection network on chip with the same scale.
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