By John M. Levesque
Contents: advent; Supercomputer structure; Fortran; Vectorization of Fortran courses. Index. This publication explains intimately either the underlying structure of cutting-edge supercomputers and the style in which a compiler maps Fortran code onto that structure. most crucial, the constructs combating complete optimizations are defined, and particular recommendations for restructuring a application are supplied.
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Additional resources for A Guidebook to Fortran on Supercomputers
8 Gather Vector A Randomly 69 + N / . 8 69 + N / . 8 69 + N / . 8 69 + N / . 8 Gather Vector A Periodically 39 + N / . 8 39 + N / . 8 39 + N / . 8 39 4- N / . 8 Compress Vector A (Z # of element compressed) 52 + Z/2 52 + Z/4 52 + Z/4 52 + Z/8 Expand Vector A (Z # of elements expanded) 58 + Z/2 58 + Z/4 58 + Z/4 58 + Z/8 Sum of Elements 116+ N 116 + N 116-hN 116 + N Dot Product 116+ N 116 + N 116+ N 116+ N a Vector length = N. Format is startup time + result rate. Table derived from Clifford N. Arnold, "Vector Optimization on the CYBER 205," Control Data Corporation, Arden Hills, MN.
8 Scatter Vector A Periodically 71 + N / . 8 71 + N / . 8 71 + N / . 8 Gather Vector A Randomly 69 + N / . 8 69 + N / . 8 69 + N / . 8 69 + N / . 8 Gather Vector A Periodically 39 + N / . 8 39 + N / . 8 39 + N / . 8 39 4- N / . 8 Compress Vector A (Z # of element compressed) 52 + Z/2 52 + Z/4 52 + Z/4 52 + Z/8 Expand Vector A (Z # of elements expanded) 58 + Z/2 58 + Z/4 58 + Z/4 58 + Z/8 Sum of Elements 116+ N 116 + N 116-hN 116 + N Dot Product 116+ N 116 + N 116+ N 116+ N a Vector length = N. Format is startup time + result rate.
A( 3) + B( 3) ... + ... 13. Vector Mask Operations for Loop 2210 systems the vector-mask register can be applied to the divide operation so that only where the bit is one is the divide result actually generated. ) In the "compressed-index" approach to the preceding DO loop, a vector register is generated containing those indexes where the condition is true. This register can then perform indirect address operations on the arrays involved. Computation is performed on only the elements that would be handled if the loop were executed in scalar mode.