f_chunking_performance.f90 File Reference

Demonstrates chunking strategies and I/O performance impact (Fortran) More...

Functions/Subroutines
program	f_chunking_performance
subroutine	create_chunked_file (filename, strategy_name, storage, chunksizes, data, write_time)

Detailed Description

Demonstrates chunking strategies and I/O performance impact (Fortran)

Fortran equivalent of chunking_performance.c, exploring NetCDF-4 chunking using the Fortran 90 NetCDF API. Creates datasets with different chunking strategies.

Learning Objectives:

• Configure chunking with nf90_def_var_chunking() in Fortran
• Measure I/O performance for different chunk sizes
• Select optimal chunking for Fortran access patterns

Fortran Chunking Functions:

• nf90_def_var_chunking(ncid, varid, storage, chunksizes)
• storage: NF90_CONTIGUOUS or NF90_CHUNKED
• chunksizes: Integer array with chunk dimensions

Prerequisites:

• f_simple_nc4.f90 - NetCDF-4 format basics
• chunking_performance.c - C equivalent

Related Examples:

• chunking_performance.c - C equivalent
• f_compression.f90 - Compression requires chunking

Compilation:

gfortran -o f_chunking_performance f_chunking_performance.f90 -lnetcdff -lnetcdf

Author

Edward Hartnett, Intelligent Data Design, Inc.

Date

2026

Function/Subroutine Documentation

create_chunked_file()

subroutine f_chunking_performance::create_chunked_file	(	character(len=*), intent(in)	filename,
		character(len=*), intent(in)	strategy_name,
		integer, intent(in)	storage,
		integer, dimension(3), intent(in)	chunksizes,
		real, dimension(:,:,:), intent(in)	data,
		real(8), intent(out)	write_time
	)

f_chunking_performance()

program f_chunking_performance