Commit 49db3037 authored by Andrea Corallo's avatar Andrea Corallo
Browse files

initial implementation

parent db9ecebd
;;; gcmh.el --- the Garbage Collector Magic Hack -*- lexical-binding:t -*-
;; Copyright (C) 2019 Andrea Corallo
;; Maintainer:
;; Package: gcmh
;; Homepage:
;; Version: 0.1
;; Package-Requires:
;; Keywords: garbage collector, garbage collection
;; This file is not part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <>.
;;; Commentary:
;; Enforce an optimized Garbage Collection strategy to minimize GC
;; interference with the user activity.
;; A more detailed explanation of the rationale behind this can be found at
;;; Code:
(defcustom gcmh-low-cons-threshold gc-cons-threshold
"High cons gc threshold.
This is the gc threshold used while in idle. Default value is \
:group 'gcmh
:type 'number)
(defcustom gcmh-high-cons-threshold #x40000000
"High cons gc threshold.
This should be set to a value that makes GC unlikely but does not make the OS \
:group 'gcmh
:type 'number)
(defcustom gcmh-verbose nil
"If t print a message into when garbage collecting."
:group 'gcmh
:type 'boolean)
(defvar gcmh-timer nil
"Idle timer set for trigering GC.")
(defmacro gcmh-time (&rest body)
"Measure and return the time it takes to evaluate BODY."
`(let ((time (current-time)))
(float-time (time-since time))))
(defun gcmh-set-high-threshold ()
"Set the high gc thereshold.
This is to be used with the `pre-command-hook'."
(setq gc-cons-threshold gcmh-high-cons-threshold))
(define-minor-mode gcmh-mode
"Minor mode tweak Garbage Colelction strategy."
:lighter " GCMH"
:global t
(setq gc-cons-threshold gcmh-high-cons-threshold)
;; Print a message when garbage collecting
(setq garbage-collection-messages gcmh-verbose)
;; When idle for 15sec run the GC no matter what.
(unless gcmh-timer
(setq gcmh-timer
(run-with-idle-timer 15 t
(lambda ()
(if gcmh-verbose
(message "Garbage Collector has run for %.06fsec"
(gcmh-time (garbage-collect)))
(setq gc-cons-threshold gcmh-low-cons-threshold)))))
(add-hook 'pre-command-hook #'gcmh-set-high-threshold)))
(t (progn
(setq gc-cons-threshold gcmh-low-cons-threshold)
(cancel-timer gcmh-timer)
(setq gcmh-timer nil)
(remove-hook 'pre-command-hook #'gcmh-set-high-threshold)))))
(provide 'gcmh)
;;; gcmh.el ends here
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