Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 47 for “"Cray"”.
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Analysis of CRAY-1S Using Dataflow Graphs.
… by modeling the CPU-memory subsystem of the CRAY-1S computer. The resulting model is simulated to obtain timing ang resource usage statistics using as input a control stream that represents the instruction and data stream in the real computer system. The results obtained show several areas in …
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Vectorization and microtasking of UTCHEM on the CRAY X-MP
… was optimized/vectorized and microtasked on the CRAY X-MP. Details of implementation of these methods on UTCHEM and possible extension to other reservoir simulators were discussed. Speedup factors of up to 40 by a combination of vectorization and microtasking on a two-processor CRAY X-MP were …
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Reduction and analysis of Vla maps for 281 radio-loud quasars using the Cray Y-Mp supercomputer
The thesis reports the reduction and analysis of Very Large Array snapshot observations at 6 cm with the A and C arrays of 192 and 192 + 89 radio sources associated with quasars. The sample includes all of the candidates for the complete samples of radio-loud quasars discussed by Wills and Lynds …
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Effectiveness of program transformations and compilers for directive-based GPU programming models
… of two compilers - the PGI compiler and the Cray compiler, as tools for translation of C programs written for single or multicore CPUs to heterogeneous programs that execute on NVIDIA's GPUs. In our methodology, we apply a sequence of transformations to CPU programs that allow the compilers …
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Software Testing of Parallel Programming Frameworks
… affinity and thread safety, as implemented in Cray compilers and libraries. These tests, the focus of which were robustness, re-usability, and detailed error output, contributed to software quality for the wide range of applications for which Cray compilers are used, and continue to help Cray …
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Frontal algorithms for equation-based chemical process flowsheeting on vector and parallel computers
… the frontal approach performs very well on the CRAY X-MP/416 architecture. However, several pivot steps have to be overlapped on the CRAY-2 computer to ensure that both vector floating-point pipes are kept busy. Results concerning the use of multiple pivot steps indicate that two new …
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Gwadapt: An adaptive finite element algorithm for groundwater contaminant transport problems
… in this study was modified for execution on the Cray Y-MP supercomputer. Optimization of the code was undertaken for maximum efficiency and economy on the Cray Y-MP processor, and to reduce run times for several of the simulations in this study; The computer code was used to simulate the first …
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Run-Time Techniques for Dynamic Multithreaded Computations
… of mechanisms on two target platforms, the Cray T3D and the SGI Origin 2000, for four large irregular applications demonstrates their individual effectiveness and collective sufficiency: Each application achieves performance comparable to the best achievable using low-level means. …
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Development of Advanced Nodal Diffusion Methods for Modern Computer Architectures
… mode in less than 0.73 s (33.86 Mflops) on a Cray X-MP/48. Vector-concurrent implementations yield speedups as high as 9.19 on an Alliant FX/8. These results show that the ILLICO method preserves essentially all of its speed advantage (previously demonstrated on scalar computers) over finite …
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A parallel algorithm for sparse unsymmetric LU factorization
… metrics are analyzed on an Alliant FX/8, a Cray-2, and a Cray-XMP/48. Enhancements to PSolve, a pairwise pivoting algorithm, are discussed, and a software tool for developing sparse matrix algorithms and observing their dynamic behavior on a Sun workstation is presented. The tool was …
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Electronic, optical, and lattice properties of superlattices and heterostructures
… With the newly devised method and the aid of the CRAY supercomputer, we have been able to calculate the optical absorption spectra for a number of GaAs-Ga$\sb{1-x}$Al$\sb{x}$As superlattices and quantum wells with the valence band mixing included. The results which feature the saddle point exciton …
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A Portable and Scalable Multigrid Solver for Nonlinear Structural Mechanics Problems
… systems; an IBM SP2, an SGI Origin2000 and a CRAY T3E are employed. The obtained results shows that the proposed parallel algorithm is highly scalable and can efficiently solve large scale problems on a large number of processors.
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Performance evaluation of vector machine architectures
… of register-register vector processors, such as Cray supercomputers, as a function of their architectural features, scheduling schemes, compiler optimization capabilities, and program parameters. The results of this study also provide a base for comparing vector machines with horizontal …
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Accelerating MPI collective communications through hierarchical algorithms with flexible inter-node communication and imbalance awareness
… upon the MPICH algorithms as well as the Cray MPT algorithms. Speedups average 15x - 30x for most collectives with improved scalability up to 65536 cores.^ Further novel improvements are also proposed for inter-node communication. By utilizing algorithms which take advantage of multiple …
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Fault injections on mission-critical computer systems
… computing (HPC) systems. We target the Cray XE Blue Waters JYC testbed at the National Center for Supercomputing Applications, with the goal of improving the understanding of failure causes and propagation observed in the field failure data analysis of Blue Waters. We use data collected …
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Three-dimensional upward scheme for solving the Euler equations on unstructured tetrahedral grids
… speed of 34 microseconds per cell per cycle on a CRAY-2S supercomputer and requires 64 words of memory per cell. Transonic solutions are presented for a broad class of configurations to demonstrate the accuracy, speed, and robustness of the new scheme. Solutions are shown for the ONERA M6 wing, …
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On the Integration of Compiler-Directed Cache Coherence and Data Prefetching
… on a real system, we have prototyped it on the Cray T3D. We applied the scheme on five applications from the SPEC CFP95 and CFP92 benchmark suites and executed the resulting codes on the system. The experimental results indicate that for all of the applications studied, our scheme provides …
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Message-driven parallel language runtime design and optimizations for multicore-based massively parallel machines
… improvement on 224,076 cores of JaguarPF (Cray XT5), and about three times improvement in machine utilization on Intrepid (BlueGene/P). It also makes NAMD more scalable up to the full machine of JaguarPF and Titan (Cray XK6).
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Heat pipe effect in porous medium
… were carried out using TOUGH code on a Cray YMP-2 supercomputer; None of the fracture parameters affected the heat pipe performance except the mobility of the liquid in the fracture. Matrix permeability and thermal conductivity were found to have significant effect on the heat pipe …
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A 3-dimensional H-adaptive algorithm for groundwater flow and contaminant transport
… The simulation was run on the SGI-02 and the SGI-Cray origin 2000 located at UNLV.
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