RISC-based Massively Parallel Processors (MPPs) often show low efficiency in real-world applications because of cache miss penalty, insufficient throughput of the memory system, and poor inter-processor communication performance. Hitachi's SR2201, an MPP scalable up to 2048 processors and 600 GFLOPS peak performance, overcomes these problems by introducing three novel features. First, its proce...

Clusters of workstations represent today a satisfactory alternative to MPPs and supercomputers in many areas of application. The rapidly reduction of the cost of high performance workstations/PCs makes this technology ever more available. Moreover, new concepts for the integration of individual workstations through Local Area Networks are emerging. High speed interconnection networks and optimi...

The increased popularity and the growth in the number of deployed IEEE 802.11 Access Points (APs) have raised the opportunity to merge together various disjointed wireless LANs to form a unique wireless mesh network (WMN). In this architecture only few nodes, called Portals (MPPs), interface to the external world thanks to their bridging/gateway functions, while several Mesh Points (MPs) form a...

We have taken our existing auto-tasked vector Cray C-90 3d Quasi-Geostrophic Multi-Grid (QGMG) code and implemented it in a portable way on most of todays MPPs. Here we report on its performance for the Cray T3D and IBM SP2. On all 16 processors of the C-90 the code achieved 6 GGops; currently on 256 processors of the T3D we obtain almost 4 GGops and on 256 processors of the SP2 we obtain 5 GGo...

This paper presents analysis of the Windows kernel network stack and designs a novel high-performance NDIS driver platform called IRLstack whose goal is to enable large-scale Internet measurements that require sending billions of packets and managing millions of outstanding connections on inexpensive commodity hardware available to any research lab. Our results show that with just 75% of one mo...

Re-use of synchronization code in concurrent OOlanguages has been considered di cult due to inheritance anomaly, which we minimize with our new proposal. Designed with high practicality in mind, we propose language primitives (plus their implementation) with the following characteristics: (1) it allows multiple synchronization schemes|the language schemes for programming synchronization|to coex...

Understanding how chromatin modification regulates development and disease can be limited by available material. Despite recent progress, balancing high-quality and reliable mapping using chromatin-immunoprecipitation-based deep sequencing (ChIP-seq) remains a challenge. We report two techniques, recovery via protection (RP)-ChIP-seq and favored amplification RP-ChIP-seq (FARP-ChIP-seq), that p...

We have parallelized our existing auto-tasked vector Cray C-90 3d Quasi-Geostrophic Multi-Grid (QGMG) code in a portable and eecient way for todays MPPs. The QGMG code addresses one of the most important computational problems today: the numerical simulation of high Reynolds number uid turbulence. In this paper we describe how we did this parallelization, emphasising both portability and eecien...

The most promising probe to establish the Majorana or Dirac nature of neutrino is neutrinoless double beta decay and effective mass would be evaluated by knowledge corresponding nuclear matrix elements. Also measurements Double Charge Exchange (DCE) interactions heavy ion beams can get information on them. NUMEN experiment based pre-existing large acceptance MAGNEX spectrometer integrated with ...

Photovoltaic (PV) energy is a promising source of renewable which sturdy and environmentally friendly. PV generation systems, once installed, produce electricity from solar irradiance without emitting greenhouse gases. To maximize the output power maximum point tracking system has been employed (MPPT). The MPPT constitutes fundamental part systems. In recent years, large number techniques have ...