Initial commit

poky/documentation/dev-manual/disk-space.rst

@@ -0,0 +1,45 @@
+.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
+
+Conserving Disk Space
+*********************
+
+Conserving Disk Space During Builds
+===================================
+
+To help conserve disk space during builds, you can add the following
+statement to your project's ``local.conf`` configuration file found in
+the :term:`Build Directory`::
+
+   INHERIT += "rm_work"
+
+Adding this statement deletes the work directory used for
+building a recipe once the recipe is built. For more information on
+"rm_work", see the :ref:`ref-classes-rm-work` class in the
+Yocto Project Reference Manual.
+
+When you inherit this class and build a ``core-image-sato`` image for a
+``qemux86-64`` machine from an Ubuntu 22.04 x86-64 system, you end up with a
+final disk usage of 22 Gbytes instead of &MIN_DISK_SPACE; Gbytes. However,
+&MIN_DISK_SPACE_RM_WORK; Gbytes of initial free disk space are still needed to
+create temporary files before they can be deleted.
+
+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::
+
+   sstate-cache-management.sh --remove-duplicated --cache-dir=build/sstate-cache
+
+This command will ask you to confirm the deletions it identifies.
+
+.. note::
+
+   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.
+
+Run ``sstate-cache-management.sh`` for more details about this script.
+