One of the most severe performance limitations of parallel applications today stems from the performance of I/O operations. Numerous projects have shown, that parallel I/O in combination with parallel file systems can significantly improve the performance of I/O operations. However, as of today there is no support for parallel I/O operations for applications using shared-memory programming mode...

BACKGROUND We analyzed simulated data from the 14th QTL-MAS workshop using a Bayesian approach implemented in the program iBay. The data contained individuals genotypes for 10,031 SNPs and phenotyped for a quantitative and a binary trait. RESULTS For the quantitative trait we mapped 8 out of 30 additive QTL, 1 out of 3 imprinted QTL and both epistatic pairs of QTL successfully. For the binary...

One of the main obstacles in applying data mining techniques to large, real-world databases is the lack of eecient data management. In this paper, we outline a two-level architecture, consisting of a mining tool and a database server. Key elements in its success are a clear separation of concerns: the mining tool organizes and controls the search process, while all data-handling is performed by...

The constrained migration problem arises in the memory management of large multiprocessor systems. Given a network of processors, each of which has its own local memory, the purpose of this problem is to nd an e cient migration strategy which locates each writable page at an appropriate processor by migration to reduce the total access cost, while considering the actual capacity of each local m...

Indexing moving objects usually involves a great amount of updates, caused by objects reporting their current position. In order to keep the present and past positions of the objects in secondary memory, each update introduces an I/O and this process is sometimes creating a bottleneck. In this paper we deal with the problem of minimizing the number of I/Os in such a way that queries concerning ...

Performance estimation is essential for designing and investigating of new architectures including multiprocessors. Software simulation is one of the most common methods, since there is no limitation on device technology nor hardware configuration. Although lots of software simulators have been developed and used, they must be modified for each distinct target system. For designers of new archi...

Program obfuscation is the process of taking a program as an input and modifying it so that the resulting program has the same I/O behavior as the input program but otherwise looks`completely garbled' to the entity that runs it, even if this entity is adversarial and has full access to the program. Impossibility results, origination with the work of Barak etal in 2001, have been proved that ass...

In this paper, we investigate the nature of DMA mechanism wherein there is an explicit product-consume relationship. Base on this observation we propose a DMA Cache technique to improve performance of DMA operations. To evaluate this technique, we adopt a hardware-based memory trace collection tool and an FPGA-based tracedrive emulation system. Experimental results show that DMA Cache can impro...

The memory size limits the scalability of virtual machine systems. There have been some researches about sharing identical pages among guest systems to reduce memory usage. However, they require memory overcommitment feature through swap mechanism which some virtual machines including Xen do not have. In this paper a new approach is proposed to share identical pages with designated sharing area...