Nowadays, many factors support a growing production of information. Domains like Information Retrieval or Digital Libraries that deal with digital information are highly concerned by this growth that has an impact on information systems performances. In this study, we analyze the way these two research fields face the problem of scalability.

In contrast to optimization techniques intended to find a single, global solution in a problem domain, niching (speciation) techniques have the ability to locate multiple solutions in multimodal domains. Numerous niching techniques have been proposed, broadly classified as temporal (locating solutions sequentially) and parallel (multiple solutions are found concurrently) techniques. Most resear...

We apply the two-stage reliable and scalable SIP server architecture proposed in [1] for presence. The first stage proxies the requests to one of second stage server groups based on the event header and destination user identifier. The destination user identifier is based on presentity’s URI. Such a system achieves uniform load sharing on the servers on an average. However, in certain cases the...

Network-based attacks, such as DDoS attacks and worms, are threatening the continued utility of the Internet. As the variety and the sophistication of attacks grow, early detection of potential attacks will become crucial in mitigating their impact. We argue that the Gigascope data stream management system has both the functionality and the performance to serve as the foundation for the next ge...

Since CPUs hit the power-wall earlier this decade single threaded CPU performance has been increasing at a much lower pace than it historically used to in earlier decades1. The recent trend in hardware is to go multi-core and multi-threaded for more performance instead. Multi-core means that the CPU package has more than one CPU core inside and acts like multiple CPUs. Multi threaded CPUs are u...

Microservice architectures provide small services that may be deployed and scaled independently of each other, and may employ different middleware stacks for their implementation. Microservice architectures emphasize transaction-less coordination between services, with explicit acceptance of eventual consistency. Polyglott persistence in this context means that the individual microservices may ...

We explore scalability issues of the text classification problem where using (multi)labeled training documents we try to build classifiers that assign documents into classes permitting classification in multiple classes. A new class of classification problems, called ‘scalable’ is introduced that models many problems from the area of Web mining. The property of scalability is defined as the abi...

Many hydrodynamic processes can be studied in a way that is scalable over a vastly relevant physical parameter space. We systematically examine this scalability, which has so far only briefly discussed in astrophysical literature. We show how the scalability is limited by various constraints imposed by physical processes and initial conditions. Using supernova remnants in different environments...

lmbench3 extends the lmbench2 system to measure a system’s performance under scalable load to make it possible to assess parallel and distributed computer performance with the same power and flexibility that lmbench2 brought to uni-processor performance analysis. There is a new timing harness, benchmp, designed to measure performance at specific levels of parallel (simultaneous) load, and most ...

Deduplication, a form of compression aiming to eliminate duplicates in data, has become an important feature of most commercial and research backup systems. Since the advent of deduplication, most research efforts have focused on maximizing deduplication efficiency—i.e., the offered compression ratio—and have achieved near-optimal usage of raw storage. However, the capacity goals of next-genera...