How to create large temp files quickly (for testing purposes)

Quick and dirty way to just create a 10GB temp file for testing e.g. network transfer speeds.


fallocate -l 10G temp_10GB_file


The file size is defined in bytes. Use Google to do the conversion if you’re unsure.

fsutil file createnew temp_10GB_file 10000000000

Mac OS X

mkfile -n 10g temp_10GB_file