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043135a848
In addition: - Take the opportunity to add a bunch more missing hyperlinks, too. - Remove some glossary entries that are now subsumed by dedicated pages. We used to not be able to do this without breaking link fragments, but now we can, so pick up where we left off. Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
41 lines
1.2 KiB
Markdown
41 lines
1.2 KiB
Markdown
# Name
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`nix-store --optimise` - reduce disk space usage
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## Synopsis
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`nix-store` `--optimise`
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## Description
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The operation `--optimise` reduces Nix store disk space usage by finding
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identical files in the store and hard-linking them to each other. It
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typically reduces the size of the store by something like 25-35%. Only
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regular files and symlinks are hard-linked in this manner. Files are
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considered identical when they have the same [Nix Archive (NAR)][Nix Archive] serialisation:
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that is, regular files must have the same contents and permission
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(executable or non-executable), and symlinks must have the same
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contents.
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After completion, or when the command is interrupted, a report on the
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achieved savings is printed on standard error.
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Use `-vv` or `-vvv` to get some progress indication.
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{{#include ./opt-common.md}}
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{{#include ../opt-common.md}}
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{{#include ../env-common.md}}
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## Example
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```console
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$ nix-store --optimise
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hashing files in `/nix/store/qhqx7l2f1kmwihc9bnxs7rc159hsxnf3-gcc-4.1.1'
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...
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541838819 bytes (516.74 MiB) freed by hard-linking 54143 files;
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there are 114486 files with equal contents out of 215894 files in total
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```
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[Nix Archive]: @docroot@/store/file-system-object/content-address.md#serial-nix-archive
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