Practical Enhancement of User Experience in NVMe SSDs

When processing I/O requests, the current Linux kernel does not adequately consider the urgency of user-centric tasks closely related to user experience. To solve this critical problem, we developed a practical method in this study to enhance user experience in a computing environment wherein non-volatile memory express (NVMe) solid-state drives (SSDs) serve as storage devices. In our proposed scheme, I/O requests that originate from the user-centric tasks were preferentially served across various levels of queues by modifying the multi-queue block I/O layer of the Linux kernel, considering the dispatch method of NVMe SSDs. Our scheme tries to give as fast a path as possible for I/O requests from user-centric tasks among many queues with different levels. Especially, when the SSD is overburdened, it avoids the queues with many pending I/O requests and thus can significantly reduce the I/O latency of user-centric tasks. We implemented our proposed scheme in the Linux kernel and performed practical evaluations on a commercial SSD. The experimental results showed that the proposed scheme achieved significant enhancement in the launch time of five widely used applications by up to ~65%.

KINERJA KANTOR PELAYANAN PAJAK PRATAMA (KPPP) MEULABOH DALAM MENINGKATKAN PELAYANAN MINAT WAJIB PAJAK

Primary Tax Office Meulaboh (KPPP) has an important role in improving the performance of public services in terms of extension function, service, and supervision to taxpayers. If seen from the function of the Primary Tax Office Meulaboh it is helpful to the Directorate General of taxes in awaken the importance of taxes to the public. The problem in this research is how the performance of Primary Tax Office Meulaboh in increasing interest taxpayers. The purpose of this study is to determine the performance of Primary Tax Office Meulaboh in increasing interest taxpayers. The research method used in this research is qualitative research method with descriptive approach. The source of data in this study consists of primary and secondary data. Then the technique of collected data used interview, observation and documentary. The location of this study was conducted in the Primary Tax Office Meulaboh West Aceh. Based on the results of research in the discussion KPPP Meulaboh in improving performance attract taxpayers. First, productivity KPPP Meulaboh not achieve results in accordance with the vision and mission of the grounds are still no customer complaints. Second, the quality of service KPPP Meulaboh also not yet maximal, the reason there are still many queues. Third; The responsiveness of KPPP Meulaboh is not good, the responsibility of KPPP Meulaboh still not maximal in giving the requirement for the taxpayer. Further Accountability KPPP Meulaboh give good results, because the responsibility is carried out according to the procedures of KPPP Meulaboh. Keywords: performance, Primary Tax Office Meulaboh, taxpayers

The caudal characteristic curve of queues

Many queues and related stochastic models, and in particular those that have a matrix-geometric stationary probability vector, have steady-state queue-length densities that are asymptotically geometric. The graph of the asymptotic rate η of these densities as a function of the traffic intensity ρ is the caudal characteristic curve. This is an informative graph from which a number of qualitative inferences about the behavior of the queue may be drawn. The caudal characteristic curve may be computed (by elementary algorithms) for several useful models for which a complete exact numerical solution is not practically feasible. These include queues with certain types of superimposed arrival processes and/or multiple non-exponential servers. The necessary theorems which lead to the algorithmic procedures as well as the interpretation of several numerical examples are discussed.

The caudal characteristic curve of queues

Many queues and related stochastic models, and in particular those that have a matrix-geometric stationary probability vector, have steady-state queue-length densities that are asymptotically geometric. The graph of the asymptotic rate η of these densities as a function of the traffic intensity ρ is the caudal characteristic curve. This is an informative graph from which a number of qualitative inferences about the behavior of the queue may be drawn.The caudal characteristic curve may be computed (by elementary algorithms) for several useful models for which a complete exact numerical solution is not practically feasible. These include queues with certain types of superimposed arrival processes and/or multiple non-exponential servers. The necessary theorems which lead to the algorithmic procedures as well as the interpretation of several numerical examples are discussed.

The caudal characteristic curve of queues

Many queues and related stochastic models, and in particular those that have a matrix-geometric stationary probability vector, have steady-state queue-length densities that are asymptotically geometric. The graph of the asymptotic rate η of these densities as a function of the traffic intensity ρ is the caudal characteristic curve. This is an informative graph from which a number of qualitative inferences about the behavior of the queue may be drawn.