Created attachment 3609 [details]
bitbake_memres_vs_nonres.log

STATUS: FAILED
BUILD: 2,3_M2 : 62d7d4130202d8ede16abf9e7d779361ca70847e
ENVIRONMENT: Fedora 24 x86_64
STEPS TO REPRODUCE: 1) get poky sources (1.5 +)

NOTE: The poky source should not have an already-made 'build' directory within

2) in a fresh shell session, source oe-init-build-env-memres
3) make any desired changes in local.conf
4) issue 'bitbake -n core-image-minimal'
-- see expected results --
5)change MACHINE to another acrhitecture in local.conf
6)  issue 'bitbake -n core-image-minimal'
-- see expected results --

7) close the bitbake server by issuing command: 'bitbake -m'

NOTE: Don't reuse this shell session for any further tests. Close it and continue testing in a new one.



EXPECTED OUTCOME:

Compare time spent for cache loading by bitbake between steps 4) and 6) . During step 6) it should be much shorter.

ACTUAL OUTCOME:

There's not significant difference between the first and the second executions. After running the script, it goes to immediately start parsing the recipes and then preparing and executing the tasks. There doesn’t seem to be any cache loading at any time either with the first or second machine setup.

I also tested by first running oe-init-build-env instead of the resident version and the behavior was pretty similar: with no significant difference, except than on the non-resident version the execution was even faster by 1 or 2 seconds.

I have attached a log with 4 timed executions exemplifying the case.