diff options
| -rw-r--r-- | guix/profiling.scm | 25 |
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) |