Application performance in the QLinux multimedia operating system

Hardware virtualization plays a major role in IT infrastructure optimization in private data centers and public cloud platforms. Though there are many advancements in CPU architecture and hypervisors recently, but overhead still exists as there is a virtualization layer between the guest operating system and physical hardware. This is particularly when multiple virtual guests are competing for resources on the same physical hardware. Understanding performance of a virtualization layer is crucial as this would have a major impact on entire IT infrastructure. This article has performed an extensive study on comparing the performance of three hypervisors KVM, Xen, and Proxmox VE. The experiments showed that KVM delivers the best performance on most of the selected parameters. Xen excels in file system performance and application performance. Though Proxmox has delivered the best performance in only the sub-category of CPU throughput. This article suggests best-suited hypervisors for targeted applications.

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OPERACIONALIDADE DE APLICATIVOS DE SMARTPHONE PARA MENSURAÇÃO DE ALTURA DE ÁRVORES EM REGIÃO DE ECÓTONO CERRADO-AMAZÔNIA

Nativa ◽

10.31413/nativa.v7i2.6310 ◽

2019 ◽

Vol 7 (2) ◽

pp. 218

Author(s):

Rafaella De Angeli Curto ◽

Bruna Paz Deecken ◽

Sintia Valerio Kohler ◽

Scheila Cristina Biazatti ◽

Emanuel José Gomes Araújo ◽

...

Keyword(s):

Operating System ◽

Tree Height ◽

Average Error ◽

Homogeneous Distribution ◽

Mean Square ◽

Forest Fragment ◽

Smartphone Applications ◽

Application Performance ◽

Total Height ◽

Android Operating System

Objetivou-se verificar a operacionalidade de aplicativos de smartphones comparando-os com hipsômetro tradicional de comprovada eficiência na mensuração de altura total de árvores em fragmento florestal. O Hipsômetro Vertex IV® foi utilizado como medida real da altura total, diante da impossibilidade da obtenção da variável de forma direta. Foram selecionadas aletoriamente 90 árvores, distribuídas igualmente em três classes de altura: 1 (9,0-15,9 m); 2 (16,0-22,9 m); e 3 (> 23,0 m). Para estimar a altura total foram utilizados os aplicativos para smartphones com sistema operacional Android: Two Point Height (T.P.H); Measure Height (M.H); Smart Measure (S.M) e Hypsometer (HR). Todos aplicativos, por resultar em alturas médias estatisticamente iguais a média obtida com o Vertex®, podem ser indicados para a mensuração de árvores nas diferentes classes de altura. A análise residual e estatísticas Viés (V), Média das Diferenças Absolutas (MD), Desvio Padrão das Diferenças (DPD) e Erro Quadrático Médio (RMSE) indicaram que o Hypsometer apresentou menor tendência nas estimativas, distribuição de resíduos mais homogênea, além de resultar em menor erro médio. A atualização dos aplicativos, a resolução do acelerômetro e os cuidados na medida foram determinantes para o desempenho dos aplicativos como alternativa viável para a mensuração de árvores em relação ao custo e eficiência.Palavras-chave: vertex, acelerômetro, custo. OPERATIONALITY OF SMARTPHONE APPLICATIONS FOR MEASURING TREE HEIGHT IN THE CERRADO-AMAZON ECOTONE REGION ABSTRACT: The objective verify the operability of smartphone applications comparing them with traditional hypsometer of proven efficiency in the measurement of total height of trees in forest fragment. The Vertex IV® Hypsometer was used as a real measure of total height, due to the impossibility of obtaining the variable directly. 90 trees were randomly selected, distributed equally in three height classes: 1 (9.0-15.9 m); 2 (16.0-22.9 m); and 3 (> 23.0 m). To estimate total height, the following applications (Apps) were used for smartphones with Android operating system: Two Point Height (T.P.H); Measure Height (M.H); Smart Measure (S.M) and Hypsometer (HR). All tested applications, as they result in average heights statistically equal to the average obtained with the Vertex®, can be indicated for the measurement of trees in the different height classes. The Bias (V), Mean of Absolute Differences (MD), Standard Deviation of Differences (DPD) and Mean Square Error (RMSE) statistics indicated, considering all applications, that the Hypsometer presented a less tendentious and more homogeneous distribution of residues, besides a smaller average error. Upgrading applications, accelerometer resolution, and tailored care were key determinants of application performance as a viable alternative for tree measurement in terms of cost and efficiency.Keywords: vertex, acelerometer, cost.

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Routine Digital Processing of Microscope Images

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100181506 ◽

1990 ◽

Vol 48 (1) ◽

pp. 550-551

Author(s):

E. Wisse ◽

A. Geerts ◽

R.B. De Zanger

Keyword(s):

Operating System ◽

Digital Processing ◽

Hard Disks ◽

The Sun ◽

Tape Drive ◽

High Definition ◽

Fluorescent Microscope ◽

Microscope Images ◽

Helical Scan ◽

Ethernet Connection

The slowscan and TV signal of the Philips SEM 505 and the signal of a TV camera attached to a Leitz fluorescent microscope, were digitized by the data acquisition processor of a Masscomp 5520S computer, which is based on a 16.7 MHz 68020 CPU with 10 Mb RAM memory, a graphics processor with two frame buffers for images with 8 bit / 256 grey values, a high definition (HD) monitor (910 × 1150), two hard disks (70 and 663 Mb) and a 60 Mb tape drive. The system is equipped with Imaging Technology video digitizing boards: analog I/O, an ALU, and two memory mapped frame buffers for TV images of the IP 512 series. The Masscomp computer has an ethernet connection to other computers, such as a Vax PDP 11/785, and a Sun 368i with a 327 Mb hard disk and a SCSI interface to an Exabyte 2.3 Gb helical scan tape drive. The operating system for these computers is based on different versions of Unix, such as RTU 4.1 (including NFS) on the acquisition computer, bsd 4.3 for the Vax, and Sun OS 4.0.1 for the Sun (with NFS).

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