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76276d90ce
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.
(From OE-Core rev: 8b31c919814b8bdf25b3381053656523c001ae0d)
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
QEMU Emulation Targets ====================== To simplify development, the build system supports building images to work with the QEMU emulator in system emulation mode. Several architectures are currently supported in 32 and 64 bit variants: * ARM (qemuarm + qemuarm64) * x86 (qemux86 + qemux86-64) * PowerPC (qemuppc only) * MIPS (qemumips + qemumips64) Use of the QEMU images is covered in the Yocto Project Reference Manual. The appropriate MACHINE variable value corresponding to the target is given in brackets.