task-time: Add simple buildstats analysis script
The 'task-time' Python script is used for simple manual analysis of
buildstats. It displays task timing information in the same format (and
using the same calculation) as the Bash 'time' builtin, and can
optionally sort tasks by real (wall-clock), user (user space CPU), or
sys (kernel CPU) time used.
The timing information comes from the getrusage(2) fields added by
commit
adfdca4df18f ("buildstats: Improve to add getrusage data and
corrected IO stats"). That commit is required for the script to work.
Example 1: Running 'task-time' on a specific task buildstat:
$ task-time ./
20161005235448/gettext-0.16.1-r6/do_compile
./
20161005235448/gettext-0.16.1-r6/do_compile:
real 0m54.560s
user 0m46.028s
sys 0m2.772s
Example 2: Running 'task-time' on a directory, sorting on wall-clock
time:
$ task-time tmp/buildstats/
20161018083535 --sort real
tmp/buildstats/
20161018083535/bash-4.3.30-r0/do_fetch:
real 10m59.140s
user 0m1.152s
sys 0m0.320s
tmp/buildstats/
20161018083535/readline-native-6.3-r0/do_fetch:
real 8m57.310s
user 0m0.860s
sys 0m0.288s
tmp/buildstats/
20161018083535/perl-5.22.1-r0/do_compile:
real 4m28.840s
user 4m1.348s
sys 0m15.816s
...
Example 3: Running 'task-time' on all do_compile buildstats for a
particular build by using shell globbing, sorting on user space CPU
time:
$ task-time tmp/buildstats/
20161018083535/*/do_compile --sort user
tmp/buildstats/
20161018083535/qemu-native-2.7.0-r1/do_compile:
real 0m49.570s
user 21m45.236s
sys 1m44.380s
tmp/buildstats/
20161018083535/linux-yocto-4.8+gitAUTOINC+03bf3dd731_67813e7efa-r0/do_compile:
real 0m49.530s
user 21m39.588s
sys 1m59.576s
tmp/buildstats/
20161018083535/gcc-cross-i586-6.2.0-r0/do_compile:
real 1m8.130s
user 15m54.256s
sys 1m28.776s
...
Example 4: Comparing a task between two builds:
$ task-time
201610052{25856,35448}/gettext-0*/do_compile --sort real
20161005235448/gettext-0.16.1-r6/do_compile:
real 0m54.560s
user 0m46.028s
sys 0m2.772s
20161005225856/gettext-0.19.8.1-r0/do_compile:
real 0m41.520s
user 2m17.312s
sys 0m7.536s
Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
