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

(From OE-Core rev: 76dfad5b598e2937554bddeecf47482b14a854cd)

Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

0 files changed, 0 insertions, 0 deletions