sstate.bbclass: set SSTATE_EXTRAPATHWILDCARD explicitly
The glob.glob("/sstate/*/*/") is very time consuming, set
SSTATE_EXTRAPATHWILDCARD explicity to avoid that. This can save a lot of time
when there are many sstate files.
For example, I have more than 600,000 sstate files:
* Before
- Without disk caches
$ time python3 -c 'import glob; glob.glob("/sstate-cache/*/*/sstate:quilt-native:x86_64-linux:0.65:r0:x86_64:3:*_populate_sysroot.tgz*")'
real 4m32.583s
user 0m5.768s
sys 0m12.892s
- With disk caches
$ time python3 -c 'import glob; glob.glob("/sstate-cache/*/*/sstate:quilt-native:x86_64-linux:0.65:r0:x86_64:3:*_populate_sysroot.tgz*")'
real 0m4.111s
user 0m2.348s
sys 0m1.756s
* After
$ time python3 -c 'import glob; glob.glob("/sstate-cache.bak/universal/*/sstate:quilt-native:x86_64-linux:0.65:r0:x86_64:3:*_populate_sysroot.tgz*")'
- Without disk caches:
real 0m7.928s
user 0m0.172s
sys 0m0.124s
- With disk caches:
real 0m0.131s
user 0m0.088s
sys 0m0.044s
We can see that it saves about 3.8s with disk caches, and saves about 264s
without disk caches.
Signed-off-by: Robert Yang <liezhi.yang@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
