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Live migration of virtual machines is an important issue in Cloud computing environments: when physical hosts are overloaded, some or all virtual machines can be moved to a less loaded host. Live migration poses additional challenges when virtual machines use local persistent storage, since the complete disk state needs to be transferred to the destination host while the virtual machines are running...
The matching pair (MP) property requires that an operation P is followed by an operation V on every execution path. Memory leaks, asymmetric synchronization, and several other defects result from violations of the MP property. We propose two patterns indicative of good software design with respect to the MP property. We present an empirical study about the existence of these patterns in Linux kernel.
In this paper we present the synchronization and driver architecture of the DLR LWR-III, which supplies an easy to use interface for applications. For our purpose we abstracted the robot hardware entirely from the control algorithms using the common device driver concept of modern operating systems. The software architecture is split into two modular parts. On the one side, there are device drivers...
Many distributed systems need some sort of synchronization in order to achieve their objectives. The IEEE 1588 Precision Time Protocol (PTP) was designed to achieve synchronization among distributed clocks using a non-deterministic communication medium like Ethernet. Since Linux is becoming a leading operating system in areas like distributed measurement and control or industrial automation, we found...
Widely used network measurement applications, such as tcpdump and Wireshark, use the same common libpcap packet capture library. Libpcap assigns a 10-6 second precision timestamp to all processed frames. Higher physical bandwidth implies shorter inter-arrival times between consecutive frames. Therefore timestamp precision must be proportional to the link speed. Latest version 1.0.x of libpcap provides...
When a single source of multimedia contents is distributed to multiple reproduction devices, the audio and video contents require synchronous play for multi-channel stereo sound and lip-synchronization. This paper investigates capability of IEEE 802.11 n wireless LANs for providing synchronized services of real-time multimedia traffic. We implement IEEE 1588 Precision Time Protocol in wireless LAN...
Designing safe and predictable software for embedded applications is a considerable challenge, which has been addressed by the COMDES-II framework. This is a component-based software framework employing a timed multitasking model of computation supported by a run-time environment. This paper presents a real-time kernel implementing the run-time environment - the HARTEXmu kernel that has been specifically...
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