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dev-manual: disk-space: mention faster "find" command to trim sstate cache

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[YOCTO #15182]

(From yocto-docs rev: 6fd067639e7d6ae87bda9ea8795ebf54b8827056)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Reported-by: Yoann CONGAL <yoann.congal@smile.fr>
Reported-by: Randy MacLeod <randy.macleod@windriver.com>
Reported-by: Josef Holzmayr <jester@theyoctojester.info>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Michael Opdenacker
2023-08-11 11:03:40 +02:00
committed by Richard Purdie
parent 9bf8250a40
commit dabc3dc087
1 changed files with 25 additions and 9 deletions
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documentation/dev-manual/disk-space.rst
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@@ -27,19 +27,35 @@ Purging Duplicate Shared State Cache Files
========================================== ==========================================
After multiple build iterations, the Shared State (sstate) cache can contain After multiple build iterations, the Shared State (sstate) cache can contain
duplicate cache files for a given package, while only the most recent one duplicate cache files for a given package, consuming a substantial amount of
is likely to be reusable. The following command purges all but the disk space. However, only the most recent cache files are likeky to be reusable.
newest sstate cache file for each package::
The following command is a quick way to purge all the cache files which
haven't been used for a least a specified number of days::
find build/sstate-cache -type f -mtime +$DAYS -delete
The above command relies on the fact that BitBake touches the sstate cache
files as it accesses them, when it has write access to the cache.
You could use ``-atime`` instead of ``-mtime`` if the partition isn't mounted
with the ``noatime`` option for a read only cache.
For more advanced needs, OpenEmbedded-Core also offers a more elaborate
command. It has the ability to purge all but the newest cache files on each
architecture, and also to remove files that it considers unreachable by
exploring a set of build configurations. However, this command
requires a full build environment to be available and doesn't work well
covering multiple releases. It won't work either on limited environments
such as BSD based NAS::
sstate-cache-management.sh --remove-duplicated --cache-dir=build/sstate-cache sstate-cache-management.sh --remove-duplicated --cache-dir=build/sstate-cache
This command will ask you to confirm the deletions it identifies. This command will ask you to confirm the deletions it identifies.
Run ``sstate-cache-management.sh`` for more details about this script.
.. note:: .. note::
The duplicated sstate cache files of one package must have the same As this command is much more cautious and selective, removing only cache files,
architecture, which means that sstate cache files with multiple it will execute much slower than the simple ``find`` command described above.
architectures are not considered as duplicate. Therefore, it may not be your best option to trim huge cache directories.
Run ``sstate-cache-management.sh`` for more details about this script.