From dabc3dc087217c514d70c48d4fb083652f5fcf27 Mon Sep 17 00:00:00 2001 From: Michael Opdenacker Date: Fri, 11 Aug 2023 11:03:40 +0200 Subject: dev-manual: disk-space: mention faster "find" command to trim sstate cache [YOCTO #15182] (From yocto-docs rev: 6fd067639e7d6ae87bda9ea8795ebf54b8827056) Signed-off-by: Michael Opdenacker Reported-by: Yoann CONGAL Reported-by: Randy MacLeod Reported-by: Josef Holzmayr Signed-off-by: Richard Purdie --- documentation/dev-manual/disk-space.rst | 34 ++++++++++++++++++++++++--------- 1 file changed, 25 insertions(+), 9 deletions(-) (limited to 'documentation/dev-manual') diff --git a/documentation/dev-manual/disk-space.rst b/documentation/dev-manual/disk-space.rst index c63591cc7a..a84bef4511 100644 --- a/documentation/dev-manual/disk-space.rst +++ b/documentation/dev-manual/disk-space.rst @@ -27,19 +27,35 @@ Purging Duplicate Shared State Cache Files ========================================== After multiple build iterations, the Shared State (sstate) cache can contain -duplicate cache files for a given package, while only the most recent one -is likely to be reusable. The following command purges all but the -newest sstate cache file for each package:: +duplicate cache files for a given package, consuming a substantial amount of +disk space. However, only the most recent cache files are likeky to be reusable. - sstate-cache-management.sh --remove-duplicated --cache-dir=build/sstate-cache +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:: -This command will ask you to confirm the deletions it identifies. + find build/sstate-cache -type f -mtime +$DAYS -delete -.. note:: +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. - The duplicated sstate cache files of one package must have the same - architecture, which means that sstate cache files with multiple - architectures are not considered as duplicate. +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 + +This command will ask you to confirm the deletions it identifies. Run ``sstate-cache-management.sh`` for more details about this script. +.. note:: + + As this command is much more cautious and selective, removing only cache files, + it will execute much slower than the simple ``find`` command described above. + Therefore, it may not be your best option to trim huge cache directories. -- cgit v1.2.3-54-g00ecf