Re: [OE-core] XZ_THREADS changing do_image_cpio task hash

[Mike Crowe <mac@mcrowe.com>]

On Wednesday 11 February 2026 at 12:41:30 +0100, Alexander Kanavin wrote:
> On Tue, 10 Feb 2026 at 17:28, Mike Crowe via lists.openembedded.org
> <mac=mcrowe.com@lists.openembedded.org> wrote:
> 
> > Am I missing an obvious reason why the task hash should change? Our build
> > hosts and developer machines have varying numbers of CPUs and this is
> > causing a lack of sstate sharing. :(
> 
> There might be a real issue in there somewhere but I need to point out
> that none of the image tasks contribute anything to sstate, so if you
> want to improve sstate reuse, images are the wrong place to start
> looking.

It's actually the kernel tasks that include the initramfs image that I'm
interested in getting from sstate.

In my testing, although the image is always rebuilt, the kernel does
successfully come from sstate when XZ_THREADS matches.

(There is also an ugly proliferation of separate siginfo files for the
various hashes in sstate, even if there are no actual artifacts, but these
are small.)

Thanks.

Mike.