(xemacs.info)Auto Save Control
14.5.2 Controlling Auto-Saving
Each time you visit a file, auto-saving is turned on for that file's
buffer if the variable `auto-save-default' is non-`nil' (but not in
batch mode; Note: Entering Emacs). The default for this variable is
`t', so Emacs auto-saves buffers that visit files by default. You can
use the command `M-x auto-save-mode' to turn auto-saving for a buffer
on or off. Like other minor mode commands, `M-x auto-save-mode' turns
auto-saving on with a positive argument, off with a zero or negative
argument; with no argument, it toggles.
Emacs performs auto-saving periodically based on counting how many
characters you have typed since the last time auto-saving happened. The
variable `auto-save-interval' specifies the number of characters
between auto-saves. By default, it is 300. Emacs also auto-saves
whenever you call the function `do-auto-save'.
Emacs also does auto-saving whenever it gets a fatal error. This
includes killing the Emacs job with a shell command such as `kill
-emacs', or disconnecting a phone line or network connection.
You can set the number of seconds of idle time before an auto-save is
done. Setting the value of the variable `auto-save-timeout' to zero or
`nil' will disable auto-saving due to idleness.
The actual amount of idle time between auto-saves is logarithmically
related to the size of the current buffer. This variable is the number
of seconds after which an auto-save will happen when the current buffer
is 50k or less; the timeout will be 2 1/4 times this in a 200k buffer, 3
3/4 times this in a 1000k buffer, and 4 1/2 times this in a 2000k
For this variable to have any effect, you must do `(require 'timer)'.
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