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bitbake.conf: more deterministic xz compression (threads)

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xz archives can be non-deterministic / non-reproducible:
    a) archives are created differently in single- vs
       multi-threaded modes
    b) xz will scale down the compression level so as to
       be try to work within any memory limit given to
       it when operating in single-threaded mode

This means that due to bitbake's default of using as many
threads as there are cores in the system, files compressed
with xz will be different if built on a multi-core system
compared to single-core systems. They will also potentially
be different if built on single-core systems with different
amounts of physical memory, due to bitbake's default of
limiting xz's memory consumption.

Force multi-threaded operation by default, even on single-core
systems, so as to ensure archives are created in the same
way in all cases.

(From OE-Core rev: d96aa8594c8d7531da34645cadbac4f7549d8ae6)

Signed-off-by: André Draszik <git@andred.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
André Draszik
2020-03-03 16:05:11 +00:00
committed by Richard Purdie
parent 0d7f24ce89
commit e16134e3bb
1 changed files with 1 additions and 1 deletions
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2
meta/conf/bitbake.conf
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@@ -795,7 +795,7 @@ BB_NUMBER_THREADS ?= "${@oe.utils.cpu_count()}"
PARALLEL_MAKE ?= "-j ${@oe.utils.cpu_count()}"
# Default parallelism and resource usage for xz
XZ_DEFAULTS ?= "--memlimit=50% --threads=${@oe.utils.cpu_count()}"
XZ_DEFAULTS ?= "--memlimit=50% --threads=${@oe.utils.cpu_count(at_least=2)}"
##################################################################
# Magic Cookie for SANITY CHECK