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* `show-duplication.pl', a small utility that shows the amount of

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package duplication present in (e.g.) a profile.  It shows the
  number of instances of each package in a closure, along with the
  size in bytes of each instance as well as the "waste" (the
  difference between the sum of the sizes of all instances and the
  average size).

  $ ./show-duplication.pl /nix/var/nix/profiles/default
  gcc 11
    3.3.6 19293318
    3.4.4 21425257
    ...
    average 14942970, waste 149429707
  coreutils 6
  ...
  average package duplication 1.87628865979381, total size 3486330471, total waste 1335324237, 38.3017114443825% wasted

  This utility is useful for measuring the cost in terms of disk space
  of the Nix approach.
This commit is contained in:
Eelco Dolstra 2006-09-19 13:53:35 +00:00
parent e0afaf1857
commit 9488ae7357
2 changed files with 73 additions and 1 deletions
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scripts/optimise-store.pl
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@ -7,7 +7,6 @@ use strict;
select $ofh;
}
#my @paths = ("/nix/store/caef3a49150506d233f474322a824e50-glibc-2.3.3", "/nix/store/a8a9d585d1ad4b1bc911be7743b3b996-glibc-2.3.3");
my @paths = ("/nix/store");
my $tmpfile = "/tmp/nix-optimise-hash-list";