Download PDF by John M. Levesque: A Guidebook to Fortran on Supercomputers

By John M. Levesque

ISBN-10: 0124447600

ISBN-13: 9780124447608

Contents: creation; Supercomputer structure; Fortran; Vectorization of Fortran courses. Index. This publication explains intimately either the underlying structure of modern supercomputers and the style wherein a compiler maps Fortran code onto that structure. most vital, the constructs fighting complete optimizations are defined, and particular options for restructuring a software are supplied

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Extra info for A Guidebook to Fortran on Supercomputers

Example text

The arithmetic, logical, and memory operations of the CPU are carried out by two sets of segmented functional units, one exclusively for scalar instructions, the other for vector floating point. There are functional units for scalar integer arithmetic, logical operations, and scalar floating-point a d d / subtract, multiply, divide, and square root. The vector functional units per­ form floating-point add/subtract, multiply, divide, and square root. Basic Vector Operations. CYBER 205 vector operations are performed in either one, two, or four pipelines, depending on the model of the machine.

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.

The Partitioned CPU. We have seen in the preceding basic features that a single CPU designed as a collection of independent functional units can sustain several arithmetic and logical operations simultaneously. It is impor­ tant to note that such a CPU contains only one instruction processor and so processes a single instruction stream, issuing the instructions one at a time. It is the functional units operating independently that allow new instructions to be issued before previous instructions have completed execution.

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A Guidebook to Fortran on Supercomputers by John M. Levesque

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