Performance of distributed systems can be improved from scheduling of tasks aspect. A good scheduling algorithm can enhance the performance of the distributed system significantly. In this paper we have compared the performance of batch mode and immediate mode schedulers in heterogeneous distributed computing environment. An immediate mode scheduler only considers a single task for scheduling o...

The CPU scheduler is an essential component of vSphere 5.x. All workloads running in a virtual machine must be scheduled for execution and the CPU scheduler handles this task with policies that maintain fairness, throughput, responsiveness, and scalability of CPU resources. This paper describes these policies, and this knowledge may be applied to performance troubleshooting or system tuning. Th...

WiMAX OFDMA downlink subframes have a special 2-D channel time structure. The resource allocations from this structure incur extra control overheads that hurt network performance. Existing solutions try to improve network performance by designing either the scheduler in the MAC layer or the burst allocator in the physical layer, but the efficiency of overhead reduction is limited. In this paper...

Advanced Switching (AS) is a new fabric-interconnect technology that further enhances the capabilities of PCI Express. On the other hand, the provision of Quality of Service (QoS) in computing and communication environments is currently the focus of much discussion and research in industry and academia. A key component for networks with QoS support is the egress link scheduling algorithm. AS de...

The CPU scheduler is an essential component of vSphere 5.x. All workloads running in a virtual machine must be scheduled for execution and the CPU scheduler handles this task with policies that maintain fairness, throughput, responsiveness, and scalability of CPU resources. This paper describes these policies, and this knowledge may be applied to performance troubleshooting or system tuning. Th...

In scheduling, the main factor that affects searching speed and mapping performance is the number of resources or the size of search space. In grid computing, the scheduler performance plays an essential role in the overall performance. So, it is obvious the need for scalable scheduler that can manage the growing in resources (i.e. scalable). With the assumption that each resource has its own s...

Imprecise input data imposes additional challenges to grid scheduling. This paper introduces a novel scheduler based on fuzzy optimization called IP-FULL-FUZZY which considers uncertainties of both application demands and of resource availability. The effectiveness of the proposed scheduler is compared to those of a non-fuzzy scheduler as well as to those of a fuzzy scheduler which considers on...

The CPU scheduler is an essential component of vSphere 5.x. All workloads running in a virtual machine must be scheduled for execution and the CPU scheduler handles this task with policies that maintain fairness, throughput, responsiveness, and scalability of CPU resources. This paper describes these policies, and this knowledge may be applied to performance troubleshooting or system tuning. Th...

We present a new scheduler architecture, which permits adding QoS policies to the scheduling decisions. We also present a new scheduling synthesis method which allows a designer to obtain a safe scheduler for a particular application. Our scheduler architecture and scheduler synthesis method can be used for heterogeneous applications where the tasks communicate through various synchronisation p...

Real-time applications require an eficient scheduler supporting multiple priority levels and fast preemption. In this paper, we propose a scheduler based on the hardware-supported scheduler of transputers, Though the hardware-supported scheduler of transputers is very eficient in terms of scheduling overhead, it should be extended to support multiple priority levels and fast preemption in order...