509 research outputs found
alexandru-uta/cloud_network_variability_data: Cloud Network Variability Data
No full text# Dataset on Cloud Network Variability
This is the dataset obtained while benchmarking public and private clouds for the following article:
### Alexandru Uta, Alexandru Custura, Dmitry Duplyakin, Ivo Jimenez, Jan Rellermeyer, Carlos Maltzahn, Robert Ricci, Alexandru Iosup. Is Big Data Performance Reproducible in Modern Cloud Networks?. In proceedings of 17th USENIX Symposium on Networked Systems Design and Implementation (NSDI), 2020, February 25-27, Santa Clara, USA.
The dataset contains bandwidth variability data for:
- Amazon EC2
- Google Compute Engine
- Microsoft Azure (limited data)
- Scaleway (limited data)
- SURFsara HPCCloud
The dataset contains TCP latency (RTT) data for:
- Amazon EC2
- Google Compute Engine
The dataset contains data regarding token bucket sizes (explained in depth in the aforementioned article) for Amazon EC2.
Please note that the full archive is over 3.5 GB of data, made up of hundreds of thousands of small files. This is why we decided to archive the data, which we then split into smaller files, to accommodate for the Github max file size of 100 MB.
===== DETAILS ON THE ARCHIVE FORMAT =====
1. The Bandwidth Variability data:
- archived in the bandwidth_variability_data.tar.bz2.parta, .partb, .partc
- after unpacking the archive, the data is split in directories per machine type, and experiment type, for example:
--- perfvar-aws-m5xlarge-fullspeed: contains iperf3 output files for continuous communication between 2 m5.xlarge VMs in Amazon EC2.
--- perfvar-google-4cpu-bursty-5s30s: contains iperf3 output files for bursty communication (5 seconds communication, 30 seconds break; repeat)
2. The Latency Variability data:
- archived in the file latency_study.tar.bz2
- after unpacking the archive, the directories contain TCP dump RTT data and iperf3 outputs
3. The Token Bucket AWS study:
- archived in the file token_bucket_study.tar.bz2
- contains files of form INSTANCE_TYPE-REGION-TIMESTAMP.{bw, raw, tb}
- files with extension .raw contain raw iperf3 client output
- files with extension .bw contain bandwidth samples taken at 1 second intervals from the iperf3 utility
- files with extension .tb contain a triple of form
- example of a file name: c5.2xlarge-us-west-1-1567733720.ra
Graphless:Toward serverless graph processing
Full text linkOur society is increasingly solving complex problems through the use of graph processing. Existing graph processing systems focus on performance, which allows addressing ever-larger and more complex problems. They also require uncommon expertise to properly deploy and utilize. To make graph processing generally accessible-to small and medium enterprises and institutions, to common research groups, to individuals-, in this work we design and implement the Graphless graph-processing system. Graphless is based on the serverless paradigm, which proposes to simplify computing by letting developers only focus on small, stateless functions, which are deployed and managed automatically. We address with Graphless the key challenge of combining the stateless functions assumed by serverless computing with the (opposite) data-intensive nature of graph processing. Graphless tackles this challenge through an architectural approach that allows it to deploy with push or with pull operation, and a collection of backend services, such as an orchestrator and a memory-as-a-service component. We implement Graphless and conduct with it real-world experiments using Amazon Lambda for cloud-based serverless resources. Using the LDBC Graphalytics benchmark, we analyze Graphless, and compare its performance and operational cost with the graph-processing systems Apache Giraph (big data domain) and GraphMat (HPC). Overall, we show evidence Graphless provides performance and cost-efficiency similar to Giraph, for algorithms that can benefit from fine-grained elasticity, and lower than GraphMat, but is architecturally easier to deploy, and provides both push and pull operation.</p
Attributes assessing the quality of microservices automatically decomposed from monolithic applications
No full textThe architectural styles in the world of software development are constantly evolving. Recently the microservice architecture is gaining more and more traction, building on concepts of Service Oriented Architecture (SOA) and steering further away from monolithic architectures. Emerged from agile communities, the microservice oriented architecture implies a number of small-sized microservices independently deployable. The adoption of microservices as the base for creating enterprise applications is certain, yet many companies intend to migrate from the old monolithic style instead of creating new products mainly due to cost related implications as well as challenging and complex tasks. Several tools and approaches for the semi-automatic decomposition of monolithic applications to microservices have emerged, yet many of them still struggle to verify the result of such process, the architect being indispensable for assessing the output microservices. Although this area is intensely studied, no unanimously accepted and clear guidelines for defining a good microservice exist. This survey focuses on providing a comprehensive and broadly applicable set of quality assessment criteria for microservices resulted from semi-automatic migration tools or techniques. Our study aligns with industry requirements, including a case study which further validates our set of quality attributes. In the refinement step of the quality attributes set, the prospect of automating the process of validation is also discussed.</p
The civil position of Alexandru V. Boldur
No full textThe article is devoted to the civil position of the Bessarabian historian Alexandru Boldur in certain life circumstances. The author on the basis of archival materials presents and analyzes a concrete example - two appeals, the first to the Bucharest authorities through the newspaper "Romany Libera", and the second on the occasion of the obituary dedicated to the historian Alexander Gonts. This is a convincing evidence of the personality of a man who was distinguished by courage and perseverance, such as Alexandru Boldur
ON THE MOLECULAR STRUCTURE OF THE CO-AUTHOR NETWORK OF ALEXANDRU T. BALABAN
No full textScientometric networks based on the bibliography of Professor Alexandru T. Balaban are analyzed. His position in the topological index research community and the structure of his own co-author network are considered. An analogy is suggested between coauthor networks and molecular structures.</p
Portfolio scheduling for managing operational and disaster-recovery risks in virtualized datacenters hosting business-critical workloads
Full text linkCloud datacenters are increasingly hosting business workloads. Such long-running, on-demand workloads raise important challenges in datacenter operation, requiring efficient online scheduling of workloads with unprecedented characteristics under strict service level agreements (SLAs). In this work, we propose an approach to manage the risk of not meeting SLAs. Our approach is based on portfolio scheduling, which is an online scheduling technique that dynamically selects a scheduling algorithm from a set (portfolio), subject to a possibly changing utility function. Ours is the first datacenter-scheduling approach to consider operational and disaster-recovery risks. Using trace-based simulation with traces collected from a commercial multi-datacenter environment, we give evidence that portfolio scheduling is able to mitigate risks significantly better than its constituent scheduling algorithms and better than datacenter engineers.</p
The coming age of pervasive data processing
No full textEmerging Big Data analytics and machine learning applications require a significant amount of computational power. While there exists a plethora of large-scale data processing frameworks which thrive in handling the various complexities of data-intensive workloads, the ever-increasing demand of applications have made us reconsider the traditional ways of scaling (e.g., scale-out) and seek new opportunities for improving the performance. In order to prepare for an era where data collection and processing occur on a wide range of devices, from powerful HPC machines to small embedded devices, it is crucial to investigate and eliminate the potential sources of inefficiency in the current state of the art platforms. In this paper, we address the current and upcoming challenges of pervasive data processing and present directions for designing the next generation of large-scale data processing systems.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Data-Intensive System
Alexandru Busuioceanu in Spain: poet and teacher
Full text linkRomanian author, Alexandru Busuioceanu (1896-1961), had a long trajectory as poet, art historian and essayist in Romanian language when he was appointed cultural counselor in Madrid in 1942. The present article proposes an overview of his professional and literary trajectory in Spain, and also an account of the perception that the critics of this country had of him
Metropolitan Alexandru Sterca-Şuluţiu in the National Movement
No full textThis study examines the activities of the Romanian Greek Catholic (Uniate) Metropolitan (Archbishop) of Blaj, Alexandru Sterca-Şuluţiu in support of the Romanian national movement in the Habsburg province of Transylvania between 1860 and 1865. His colleague, the Orthodox Bishop Andrei Şaguna, is the better known Transylvanian Romanian leader in this story, but Sterca-Şuluţiu made a unique contribution through his combative style that reflects his social origin as a member of the minor nobility of Transylvania's western mountain region
Alexandru Busuioceanu en España: poeta y profesor
Full text linkRomanian author, Alexandru Busuioceanu (1896-1961), had a long trajectory as poet, art historian and essayist in Romanian language when he was appointed cultural counselor in Madrid in 1942. The present article proposes an overview of his professional and literary trajectory in Spain, and also an account of the perception that the critics of this country had of him.El escritor rumano, Alexandru Busuioceanu (1896-1961), tras una larga trayectoria como poeta, historiador del arte y ensayista en lengua rumana, es nombrado consejero cultural en Madrid en 1942. Este artículo pretende hacer un repaso de su trayectoria profesional y literaria en España, así como dar cuenta de la percepción que de él tenía la crítica de este país
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