sstate.bbclass: Optimize the generation and install path fixups
The fixmepath file that is generated contains a list of all of the files
that need their paths fixed. In the previous version the fixmepath was
generated to include all of the files that sed may have changed. In the
new version, we first grep the files to see if they contain a path that
needs to be changed, only then do we perform the sed operation on those files.
This results in a modest performance increate in the creation of the sstate
file. The following numbers include the do_package and do_populate_sysroot
tasks on the perl recipe.
Before the change:
real 4m23.018s
user 1m57.067s
sys 1m33.327s
After the change:
real 4m13.083s
user 1m54.062s
sys 1m26.064s
However, a more significnt performance gain is felt during the
extraction/install of sstate cache files, as the fixmepaths file now has a
significantly smaller list of files to modify.
Before the change:
real 0m39.798s
user 0m11.158s
sys 0m12.642s
After the change:
real 0m25.511s
user 0m8.408s
sys 0m5.077s
(All numbers above were recorded with a cold filesystem cache on a machine
with 12 GB of ram.)
Signed-off-by: Mark Hatle <mark.hatle@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
