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ICCS
2005
Springer

Performance and Scalability Analysis of Cray X1 Vectorization and Multistreaming Optimization

14 years 4 months ago
Performance and Scalability Analysis of Cray X1 Vectorization and Multistreaming Optimization
Cray X1 Fortran and C/C++ compilers provide a number of loop transformations, notably vectorization and multistreaming, in order to exploit the multistreaming processor (MSP) hardware resources and its high memory bandwidth. A Cray X1 node is composed of four MSPs, which in turn are composed of four single streaming processors (SSP). Each SSP contains a superscalar processing unit and two vector processing units. Compiler vectorization provides loop level parallelization and uses the vector processing hardware. Multistreaming code generation by the compiler permits execution across the SSPs of an MSP on a block of code. In this paper, we analyze overall impact of loop-level compiler optimization on a scientific application called Parallel Ocean Program (POP). POP has been extensively optimized for X1 by instrumenting the code using X1 compiler directives. We compare and contrast automatic and manual optimization schemes available on X1 and analyze their impact on the code performance...
Sadaf R. Alam, Jeffrey S. Vetter
Added 27 Jun 2010
Updated 27 Jun 2010
Type Conference
Year 2005
Where ICCS
Authors Sadaf R. Alam, Jeffrey S. Vetter
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