461d6c2eff
* guix/profiling.scm (show-gc-stats): New procedure. <top level>: Call 'register-profiling-hook!'.
76 lines
2.5 KiB
Scheme
76 lines
2.5 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2017, 2019 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix profiling)
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#:use-module (ice-9 match)
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#:autoload (ice-9 format) (format)
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#:export (profiled?
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register-profiling-hook!))
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;;; Commentary:
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;;;
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;;; Basic support for Guix-specific profiling.
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;;;
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;;; Code:
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(define profiled?
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(let ((profiled
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(or (and=> (getenv "GUIX_PROFILING") string-tokenize)
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'())))
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(lambda (component)
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"Return true if COMPONENT profiling is active."
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(member component profiled))))
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(define %profiling-hooks
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;; List of profiling hooks.
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(map (match-lambda
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("after-gc" after-gc-hook)
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((or "exit" #f) exit-hook))
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(or (and=> (getenv "GUIX_PROFILING_EVENTS") string-tokenize)
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'("exit"))))
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(define (register-profiling-hook! component thunk)
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"Register THUNK as a profiling hook for COMPONENT, a string such as
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\"rpc\"."
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(when (profiled? component)
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(for-each (lambda (hook)
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(add-hook! hook thunk))
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%profiling-hooks)))
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(define (show-gc-stats)
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"Display garbage collection statistics."
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(define MiB (* 1024 1024.))
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(define stats (gc-stats))
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(format (current-error-port) "Garbage collection statistics:
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heap size: ~,2f MiB
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allocated: ~,2f MiB
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GC times: ~a
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time spent in GC: ~,2f seconds (~d% of user time)~%"
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(/ (assq-ref stats 'heap-size) MiB)
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(/ (assq-ref stats 'heap-total-allocated) MiB)
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(assq-ref stats 'gc-times)
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(/ (assq-ref stats 'gc-time-taken)
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internal-time-units-per-second 1.)
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(inexact->exact
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(round (* (/ (assq-ref stats 'gc-time-taken)
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(tms:utime (times)) 1.)
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100)))))
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(register-profiling-hook! "gc" show-gc-stats)
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