Data Organization in Parallel Computers by Harry A.G. Wijshoff

By Harry A.G. Wijshoff

The association of knowledge is obviously of serious significance within the layout of excessive functionality algorithms and architectures. even if there are a number of landmark papers in this topic, no entire therapy has seemed. This monograph is meant to fill that hole. We introduce a version of computation for parallel machine architec­ tures, during which we will convey the intrinsic complexity of information or­ ganization for particular architectures. We follow this version of computation to a number of latest parallel laptop architectures, e.g., the CDC 205 and CRAY vector-computers, and the MPP binary array processor. The research of knowledge association in parallel computations was once brought as early as 1970. throughout the improvement of the ILLIAC IV procedure there has been a necessity for a concept of attainable facts preparations in interleaved mem­ ory platforms. The ensuing conception dealt essentially with garage schemes also referred to as skewing schemes for 2-dimensional matrices, i.e., mappings from a- dimensional array to a few reminiscence banks. by way of the version of computation we will practice the speculation of skewing schemes to var­ ious types of parallel laptop architectures. This ends up in a couple of effects for either the layout of parallel laptop architectures and for purposes of parallel processing.

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Have to be evaluated at runtime. So, if for instance s is compactly representable and the evaluation of 'I, takes considerably more time than the evaluation of s, then the speed-up gained by the computation of s is undone by the computation of 'I,. Thus it is preferable to keep the complexity of a skewing scheme and the corresponding address function in balance (see, for instance, the BSP architecture [KS82]). Concluding we can say that, because of the great enhancement of computation speed achieved by parallel computer architectures, the usual front-end processors are becoming more and more insufficient for supplying a parallel computer architecture with the desired data at acceptable transfer rates.

Some examples of parallel computer architectures that use these interconnection networks are: the EGPA (Erlangen General Purpose Array [HHS76]) and the HAP (Hierarchical Array Processor system [Shi86]) both using a pyramid network, the COSMIC CUBE [Pea77] based on the n-dimensional cube network, and the shufRe-exchange computer as studied by Stone [Sto71] and the FFT networks [Ber72] both using the perfect shufRe network. , such that I or 1- 1 are of the form (az +b) mod N, for some a, b and N.

3. DATA COMMUNICATION 23 • to is negligible, t1 t2 = 100 ns, = 100 ns, t3 = 12900 ns ~ 13 JLS Remarks - the data locations of L1 are related to the registers in each processing element in such a way that L1 (i) represents the following register : the A register, if i mod 34 = 0, the C register, if i mod 34 = 1, the D register, if i mod 34 = 2, the B register, if i mod 34 = 3, and a location of the shift register, if i mod 34 ~ 4 - the data locations of L2 represent the local memories of each processing element - the data locations of L3 represent the staging memory - actually, the functions of:Fo only act on {V(Zh ••.

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