RE: [PATCH v2 0/1] sstate: do not keep intermediate sstate files

["Schmidt, Adriaan" <adriaan.schmidt@siemens.com>]

Uladzimir Bely, 24. Februar 2022 08:36:
> Sstate is quite demanding for disk space. And it often causes failures
> in CI, related to 'out-of-space'.

If those few GB cause problems, then you really need a larger disk :)
But I get the point, and I agree that we should try to save space.

> This patchset minimizes space usage by intermediate state files by
> removing them:
> - after sstate-cache populated: with separate task in task queue

I would like to avoid adding extra tasks. There seems to be a hook
to insert functions (SSTATEPOSTCREATEFUNCS), but as sstate is not
really documented, I have not yet figured out how to make our use case work.

> - after sstate-cache unpacked: by direct call of this task
> 
> Some results shown below for three different cases:
> 
> - sstate disabled;
> - sstate enabled;
> - sstate enabled + cleanup patch.
> 
> bullseye-arm64 cross build with full IMAGE_INSTALL list:
> 
> $ sudo du -sh build-*
> 5,7G    build-nosstate
> 12G     build-sstate
> 7,6G    build-sstate-cleanup
> 
> bullseye-arm64 cross build with empty IMAGE_INSTALL list:
> 
> $ sudo du -sh build-*
> 2,5G    build-nosstate
> 5,3G    build-sstate
> 3,4G    build-sstate-cleanup
> 
> bullseye-amd64 native build with empty IMAGE_INSTALL list:
> 
> $ sudo du -sh build-*
> 3,2G    build-nosstate
> 6,4G    build-sstate
> 4,2G    build-sstate-cleanup
> 
> 
> Changes since v1:
> - patchset renamed from "sstate: compress rootfs sstate files";
> - sstate intermediate files compression replaced by removing;
> - dpkg intermediate files are also handled.

It's unnecessary for dpkg, because we use hardlinks to the *.deb file,
so no extra disk space is consumed for the sstate preparation.

Adriaan

> 
> Uladzimir Bely (1):
>   sstate: do not keep intermediate sstate files
> 
>  meta/classes/dpkg-base.bbclass                      | 7 +++++++
>  meta/classes/rootfs.bbclass                         | 7 +++++++
>  meta/recipes-core/isar-bootstrap/isar-bootstrap.inc | 7 +++++++
>  3 files changed, 21 insertions(+)
> 
> --
> 2.20.1
> 
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