pbdNCDF4 (version 0.1-0)

nc_var_par_access: Switch between collective and individual parallel access

Description

Switches between the default individual access and collective access for a variable in a file that was opened with nc_open_par or nc_create_par.

Usage

nc_var_par_access(nc, var, collective = TRUE, verbose = FALSE)

Arguments

nc

An object of class ncdf4 (as returned by either function nc_open_par or function nc_create_par

var

Variable name or id.

collective

use collective method to read and write.

verbose

If TRUE, then messages are printed out during execution of this function.

Value

• Returns, invisibly, 0 or NetCDF error integer.

Details

Default parallel access is individual for variables. Collective access allows coordination between simultaneous requests within a communicator.

References

Programming with Big Data in R Website: http://r-pbd.org/

See Also

nc_open_par, nc_create_par, ncdim_def, ncvar_def.

Examples

### Under command mode, run the demo with 2 processors by
### (Use Rscript.exe for windows system)
mpiexec -np 2 Rscript -e "demo(ncwrite,'pbdNCDF4',ask=F,echo=F)"
mpiexec -np 2 Rscript -e "demo(ncread,'pbdNCDF4',ask=F,echo=F)"