Public bug reported:
Ubuntu OS version: oneiric
Description: Linaro 12.01
Release: 12.01
Package: time
Priority: standard
Section: utils
Installed-Size: 148
Maintainer: Ubuntu Developers <ubuntu-devel-disc...@lists.ubuntu.com>
Architecture: armel
Version: 1.7-23.1
Depends: libc6 (>= 2.4)
When time is used to measure the resources used for a long job the results
returned do not match up; the manual says that the %-age CPU used is the
elapsed time divided by the (user+system) time consumed by the job.
The example below shows that for a job that took 34 hours to run the claimed
CPU utilization was only 25%, but in reality it should be 95%.
93186.56user 24134.59system 34:07:55elapsed 25%CPU (0avgtext+0avgdata
3268608maxresident)k
0inputs+0outputs (11010major+702900386minor)pagefaults 0swaps
$ expr 93186 + 24134
117320
$ expr 117320 / 36
3258
ie ~32 1/2 hours
Shorter jobs (a few minutes) seem to show the correct %-age, so I
suspect an overflow somewhere.
** Affects: time (Ubuntu)
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/941925
Title:
Time gets % CPU time for a task wrong for long jobs
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/time/+bug/941925/+subscriptions
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
