f_compression.f90 File Reference

Demonstrates NetCDF-4 compression filters with performance analysis (Fortran) More...

Functions/Subroutines
program	f_compression
subroutine	create_compressed_file (test_name, filename, shuffle, deflate, deflate_level, data, write_time, file_size)

Detailed Description

Demonstrates NetCDF-4 compression filters with performance analysis (Fortran)

Fortran equivalent of compression.c, exploring NetCDF-4 compression using the Fortran 90 NetCDF API. Tests various compression configurations and measures performance.

Learning Objectives:

• Configure compression with nf90_def_var_deflate() in Fortran
• Measure compression performance in Fortran applications
• Select appropriate compression levels for different data

Fortran Compression Functions:

• nf90_def_var_deflate(ncid, varid, shuffle, deflate, deflate_level)
• shuffle: 0=off, 1=on
• deflate: 0=off, 1=on
• deflate_level: 1-9 (higher=better compression, slower)

Prerequisites:

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

Related Examples:

• compression.c - C equivalent
• f_chunking_performance.f90 - Chunking impacts compression

Compilation:

gfortran -o f_compression f_compression.f90 -lnetcdff -lnetcdf

Author

Edward Hartnett, Intelligent Data Design, Inc.

Date

2026

Function/Subroutine Documentation

create_compressed_file()

subroutine f_compression::create_compressed_file	(	character(len=*), intent(in)	test_name,
		character(len=*), intent(in)	filename,
		integer, intent(in)	shuffle,
		integer, intent(in)	deflate,
		integer, intent(in)	deflate_level,
		real, dimension(:,:,:), intent(in)	data,
		real(8), intent(out)	write_time,
		integer, intent(out)	file_size
	)

f_compression()

program f_compression