The Design and Implementation of the Parallel Out - of - coreScaLAPACK
نویسنده
چکیده
This paper describes the design and implementation of three core factorization routines | LU, QR and Cholesky | included in the out-of-core extension of ScaLAPACK. These routines allow the factorization and solution of a dense system that is too large to t entirely in physical memory. An image of the full matrix is maintained on disk and the factorization routines transfer sub-matrices into memory. Thèleft-looking' column-oriented variant of the factorization algorithm is implemented to reduce the disk I/O traac. The routines are implemented using a portable I/O interface and utilize high performance ScaLAPACK factorization routines as in-core computational kernels. We present the details of the implementation for the out-of-core ScaLAPACK factoriza-tion routines, as well as performance and scalability results on the Intel Paragon. for the use of the computing facilities.
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