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authorLudovic Courtès <ludo@gnu.org>2019-01-11 14:56:40 +0100
committerLudovic Courtès <ludo@gnu.org>2019-01-15 20:24:08 +0100
commit461d6c2effb8520ecb088854efd517e2efd28d30 (patch)
tree48c448d6c0abf8e1c4c990ebddcc606acbbcc61f /guix
parenteac7ed195b054baf7c153581b186f1519aca4851 (diff)
profiling: Add a "gc" profiling component.
* guix/profiling.scm (show-gc-stats): New procedure. <top level>: Call 'register-profiling-hook!'.
Diffstat (limited to 'guix')
-rw-r--r--guix/profiling.scm25
1 files changed, 24 insertions, 1 deletions
diff --git a/guix/profiling.scm b/guix/profiling.scm
index 753fc6c22e..e1c205a543 100644
--- a/guix/profiling.scm
+++ b/guix/profiling.scm
@@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2017 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2017, 2019 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -18,6 +18,7 @@
(define-module (guix profiling)
#:use-module (ice-9 match)
+ #:autoload (ice-9 format) (format)
#:export (profiled?
register-profiling-hook!))
@@ -50,3 +51,25 @@
(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)