mpi_map2alm*

This subroutine implements MPI parallelization of the serial map2alm routine. It supports both temperature and polarization inputs in both single and double precision. It must only be run by the root node of the MPI communicator.

Location in HEALPix directory tree: src/f90/mod/mpi_alm_tools.f90 

FORMAT

call mpi_map2alm*( map, alms )

ARGUMENTS

name & dimensionality	kind	in/out	description
map(0:npix,1:nmaps)	SP or DP	IN	map to analyse. If nmaps=1, only temperature information is included; if nmaps=3, polarization information is included
alms(1:nmaps,0:lmax,0:nmax)	SPC or DPC	OUT	output alms. nmaps must equal that of the input map

EXAMPLE:

call mpi_comm_rank(comm, myid, ierr)
if (myid == root) then
call mpi_initialize_alm_tools(comm, nsmax, nlmax, nmmax,
zbounds,polarization, precompute_plms)
call mpi_map2alm(map, alms)
else
call mpi_initialize_alm_tools(comm)
call mpi_map2alm_slave
end
call mpi_cleanup_alm_tools

This example 1) initializes the mpi_alm_tools module (i.e., allocates internal arrays and defines required parameters), 2) executes a parallel map2alm operation, and 3) frees the previously allocated memory.

MODULES & ROUTINES

This section lists the modules and routines used by mpi_map2alm*.

alm_tools

module

RELATED ROUTINES

This section lists the routines related to mpi_map2alm*

mpi_cleanup_alm_tools

Frees memory that is allocated by the current routine.

mpi_initialize_alm_tools

Allocates memory and defines variables for the mpi_alm_tools module.

mpi_alm2map

Routine for executing a parallel inverse spherical harmonics transform (root processor interface)

mpi_alm2map_slave

Routine for executing a parallel inverse spherical harmonics transform (slave processor interface)

mpi_map2alm_slave

Routine for executing a parallel spherical harmonics transform (slave processor interface)

mpi_alm2map_simple

One-line interface to the parallel inverse spherical harmonics transform

mpi_map2alm_simple

One-line interface to the parallel spherical harmonics transform