iparam2stage.F(3)

NAME
iparam2stage.F

SYNOPSIS

  Functions/Subroutines
integer function iparam2stage (ispec, name, opts, ni, nbi, ibi, nxi)
IPARAM2STAGE

Function/Subroutine Documentation

  integer function iparam2stage (integer ispec, character*( * ) name, character*( * ) opts, integer ni, integer nbi, integer ibi, integer nxi)

IPARAM2STAGE

Purpose:

          This program sets problem and machine dependent parameters
          useful for xHETRD_2STAGE, xHETRD_HE2HB, xHETRD_HB2ST,
          xGEBRD_2STAGE, xGEBRD_GE2GB, xGEBRD_GB2BD
          and related subroutines for eigenvalue problems.
          It is called whenever ILAENV is called with 17 <= ISPEC <= 21.
          It is called whenever ILAENV2STAGE is called with 1 <= ISPEC <= 5
          with a direct conversion ISPEC + 16.

Parameters
    ISPEC

              ISPEC is integer scalar
                  ISPEC specifies which tunable parameter IPARAM2STAGE should
                  return.
                  ISPEC=17: the optimal blocksize nb for the reduction to
                            BAND
                  ISPEC=18: the optimal blocksize ib for the eigenvectors
                            singular vectors update routine
                  ISPEC=19: The length of the array that store the Housholder
                            representation for the second stage
                            Band to Tridiagonal or Bidiagonal
                  ISPEC=20: The workspace needed for the routine in input.
                  ISPEC=21: For future release.

    NAME

              NAME is character string
                   Name of the calling subroutine

    OPTS

              OPTS is CHARACTER*(*)
              The character options to the subroutine NAME, concatenated
              into a single character string.  For example, UPLO = 'U',
              TRANS = 'T', and DIAG = 'N' for a triangular routine would
              be specified as OPTS = 'UTN'.

    NI

              NI is INTEGER which is the size of the matrix

    NBI

              NBI is INTEGER which is the used in the reduciton,
              (e.g., the size of the band), needed to compute workspace
              and LHOUS2.

    IBI

              IBI is INTEGER which represent the IB of the reduciton,
              needed to compute workspace and LHOUS2.

    NXI

              NXI is INTEGER needed in the future release.

Author
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

Further Details:

      Implemented by Azzam Haidar.
      All detail are available on technical report, SC11, SC13 papers.
      Azzam Haidar, Hatem Ltaief, and Jack Dongarra.
      Parallel reduction to condensed forms for symmetric eigenvalue problems
      using aggregated fine-grained and memory-aware kernels. In Proceedings
      of 2011 International Conference for High Performance Computing,
      Networking, Storage and Analysis (SC '11), New York, NY, USA,
      Article 8 , 11 pages.
      http://doi.acm.org/10.1145/2063384.2063394
      A. Haidar, J. Kurzak, P. Luszczek, 2013.
      An improved parallel singular value algorithm and its implementation
      for multicore hardware, In Proceedings of 2013 International Conference
      for High Performance Computing, Networking, Storage and Analysis (SC '13).
      Denver, Colorado, USA, 2013.
      Article 90, 12 pages.
      http://doi.acm.org/10.1145/2503210.2503292
      A. Haidar, R. Solca, S. Tomov, T. Schulthess and J. Dongarra.
      A novel hybrid CPU-GPU generalized eigensolver for electronic structure
      calculations based on fine-grained memory aware tasks.
      International Journal of High Performance Computing Applications.
      Volume 28 Issue 2, Pages 196-209, May 2014.
      http://hpc.sagepub.com/content/28/2/196

Definition at line 153 of file iparam2stage.F.

Author

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