76 lines
2.5 KiB
Scheme
76 lines
2.5 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
|
;;; Copyright © 2017, 2019 Ludovic Courtès <ludo@gnu.org>
|
|
;;;
|
|
;;; This file is part of GNU Guix.
|
|
;;;
|
|
;;; GNU Guix 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 Guix is distributed in the hope that it will be useful, but
|
|
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
;;; GNU General Public License for more details.
|
|
;;;
|
|
;;; You should have received a copy of the GNU General Public License
|
|
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
(define-module (guix profiling)
|
|
#:use-module (ice-9 match)
|
|
#:autoload (ice-9 format) (format)
|
|
#:export (profiled?
|
|
register-profiling-hook!))
|
|
|
|
;;; Commentary:
|
|
;;;
|
|
;;; Basic support for Guix-specific profiling.
|
|
;;;
|
|
;;; Code:
|
|
|
|
(define profiled?
|
|
(let ((profiled
|
|
(or (and=> (getenv "GUIX_PROFILING") string-tokenize)
|
|
'())))
|
|
(lambda (component)
|
|
"Return true if COMPONENT profiling is active."
|
|
(member component profiled))))
|
|
|
|
(define %profiling-hooks
|
|
;; List of profiling hooks.
|
|
(map (match-lambda
|
|
("after-gc" after-gc-hook)
|
|
((or "exit" #f) exit-hook))
|
|
(or (and=> (getenv "GUIX_PROFILING_EVENTS") string-tokenize)
|
|
'("exit"))))
|
|
|
|
(define (register-profiling-hook! component thunk)
|
|
"Register THUNK as a profiling hook for COMPONENT, a string such as
|
|
\"rpc\"."
|
|
(when (profiled? component)
|
|
(for-each (lambda (hook)
|
|
(add-hook! hook thunk))
|
|
%profiling-hooks)))
|
|
|
|
(define (show-gc-stats)
|
|
"Display garbage collection statistics."
|
|
(define MiB (* 1024 1024.))
|
|
(define stats (gc-stats))
|
|
|
|
(format (current-error-port) "Garbage collection statistics:
|
|
heap size: ~,2f MiB
|
|
allocated: ~,2f MiB
|
|
GC times: ~a
|
|
time spent in GC: ~,2f seconds (~d% of user time)~%"
|
|
(/ (assq-ref stats 'heap-size) MiB)
|
|
(/ (assq-ref stats 'heap-total-allocated) MiB)
|
|
(assq-ref stats 'gc-times)
|
|
(/ (assq-ref stats 'gc-time-taken)
|
|
internal-time-units-per-second 1.)
|
|
(inexact->exact
|
|
(round (* (/ (assq-ref stats 'gc-time-taken)
|
|
(tms:utime (times)) 1.)
|
|
100)))))
|
|
|
|
(register-profiling-hook! "gc" show-gc-stats)
|