root / synthbench / euroben-dm / mod2ci / .svn / text-base / nrm2.f.svn-base @ 0:839f52ef7657
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Function nrm2( n, x ) Result( sum ) |
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! --------------------------------------------------------------------- |
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Use numerics |
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Use floptime |
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Use mpi_module |
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Implicit None |
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Integer :: n |
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Real(l_) :: x(n) |
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Integer :: i |
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Real(l_) :: lsum, sum |
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! --------------------------------------------------------------------- |
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lsum = 0.0_l_ |
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Do i = 1, n |
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lsum = lsum + x(i)*x(i) |
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End Do |
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Call MPI_Allreduce( lsum, sum, 1, rtyp, MPI_Sum, comm, ierr ) |
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flops = flops + 2*n ! --- Keep track of flops. |
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! --------------------------------------------------------------------- |
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End Function nrm2 |