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mpi_alm_tools*
This module implements MPI parallelization of the alm2map and map2alm routines.
It is not compiled by default during installation, but rather intended for
users who need massive parallelization in their own programming. Typical
applications are Monte Carlo simulations and Markov chain type
analyses.
The routines can be called in two modes, either simple or
advanced. The former mimics the interface of the standard routines,
but with an additional MPI handle as a first argument, and is intended
for applications which requires only one or a few transforms. The
latter interface provides both more flexibility (in particular the
option of pre-computation of the Legendre polynomials) and a simpler
interface when multiple transforms are required. This interface is
particularly well suited for Monte Carlo simulations and Markov chain
type analyses.
Location in HEALPix directory tree:
src/f90/mod/mpi_alm_tools.f90
EXAMPLE:
Simple one-line interfaces:
-
mpi_map2alm_simple
-
mpi_alm2map_simple
-
Three-step advanced interfaces:
- Initialization:
mpi_initialize_alm_tools
- Execution of spherical harmonics transforms
-
mpi_map2alm (root processor)
-
mpi_alm2map (root processor)
-
mpi_map2alm_slave (slave processor)
-
mpi_alm2map_slave (slave processor)
- Finalizing:
mpi_cleanup_alm_tools
Eric Hivon
2010-06-18
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