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41 lines
1.1 KiB
Markdown
41 lines
1.1 KiB
Markdown
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# 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 NAR 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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