rclone/backend/local/preallocate_other.go

//+build !windows,!linux

package local

import "os"

// preAllocate the file for performance reasons
func preAllocate(size int64, out *os.File) error {
	return nil
}

// setSparse makes the file be a sparse file
func setSparse(out *os.File) error {
	return nil
}
local: preallocate files on linux with fallocate(2) 2018-08-20 19:14:19 +00:00			`//+build !windows,!linux`
local: preallocate files on Windows to reduce fragmentation #2469 Before this change on Windows, files copied locally could become heavily fragmented (300+ fragments for maybe 100 MB), no matter how much contiguous free space there was (even if it's over 1TiB). This can needlessly yet severely adversely affect performance on hard disks. This changes uses NtSetInformationFile to pre-allocate the space to avoid this. It does nothing on other OSes other than Windows. 2018-08-19 10:38:26 +00:00
			`package local`

			`import "os"`

			`// preAllocate the file for performance reasons`
			`func preAllocate(size int64, out *os.File) error {`
			`return nil`
			`}`
local: speed up multi thread downloads by using sparse files on Windows Before this change rclone didn't use sparse files on Windows. This means that when you downloaded a file with multithread download it wrote the entire file with zeros first on the first write not at the start of the file. This change makes the file be sparse on Windows. Linux/macOS files were already sparse. 2020-03-06 12:41:48 +00:00
			`// setSparse makes the file be a sparse file`
			`func setSparse(out *os.File) error {`
			`return nil`
			`}`