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size: Optimize dependency size computation.

This reduces 'guix size' run time by ~4% here:

  items="$(guix build icecat inkscape emacs libreoffice)"
  guix size $items

* guix/scripts/size.scm (store-profile): Define 'size-table' and use it
to lookup the size of ITEM in 'dependency-size'.
gn-latest-20200428
Ludovic Courtès 3 years ago
parent
commit
1199da08aa
No known key found for this signature in database GPG Key ID: 90B11993D9AEBB5
  1. 14
      guix/scripts/size.scm

14
guix/scripts/size.scm

@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@ -34,6 +34,7 @@
#:use-module (srfi srfi-37)
#:use-module (ice-9 match)
#:use-module (ice-9 format)
#:use-module (ice-9 vlist)
#:export (profile?
profile-file
profile-self-size
@ -142,11 +143,20 @@ profile of ITEMS and their requisites."
(lambda (size)
(return (cons item size)))))
refs)))
(define size-table
(fold (lambda (pair result)
(match pair
((item . size)
(vhash-cons item size result))))
vlist-null sizes))
(define (dependency-size item)
(mlet %store-monad ((deps (requisites* (list item))))
(foldm %store-monad
(lambda (item total)
(return (+ (assoc-ref sizes item) total)))
(return (+ (match (vhash-assoc item size-table)
((_ . size) size))
total)))
0
(delete-duplicates (cons item deps)))))

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