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PBLAS

• PBLAS perform Level 1, 2, and 3 BLAS operations on distributed matrices
• Matrices are global objects
• Matrices have a block cyclic data distribution
• PBLAS are a subset of the BLAS, but
  • no banded and packed storage schemes
  • no vector rotation routines
• Same calling sequence as BLAS except for each distributed matrix we have
  • global indices of start of matrix
  • descriptor array

    
      call pdgemm (..., a, i, j, desca, ...)