kernel-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Quoting from:
man time

"...
ACCURACY
       The elapsed time is not collected atomically with the execution of the
       program; as a result, in bizarre circumstances (if the time command
       gets stopped or swapped out in between when the program being timed
       exits and when time calculates how long it took to run), it could be
       much larger than the actual execution time.

       When the running time of a command is very nearly zero, some values
       (e.g., the percentage of CPU used) may be reported as either zero
       (which is wrong) or a question mark.

       Most information shown by time is derived from the wait3(2) system
       call.  The numbers are only as good as those returned by wait3(2).  On
       systems that do not have a wait3(2) call that returns status
       information, the times(2) system call is used instead.  However, it
       provides much less information than wait3(2), so on those systems time
       reports the majority of the resources as zero.

       The `%I' and `%O' values are allegedly only `real' input and output and
       do not include those supplied by caching devices.  The meaning of
       `real' I/O reported by `%I' and `%O' may be muddled for workstations,
       especially diskless ones.
..."

** Tags removed: time

** Changed in: linux (Ubuntu)
       Status: Confirmed => Invalid

-- 
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https://bugs.launchpad.net/bugs/675469

Title:
  System timer functionalities

Status in “linux” package in Ubuntu:
  Invalid

Bug description:
  I use to measure time using the getrusage() function in my C/C++ code
  and, suddenly, perfectly working code with previous releases of the
  kernel did not work anymore with kernel 2.6.32-25 ; The bug extends to
  the shell command "time". Its effect is that user time cannot pass a
  given threshold, around 261.8s, the rest of the running time of a
  process being counted as system time.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: linux-headers-2.6.32-25 2.6.32-25.45
  Regression: Yes
  Reproducible: Yes
  ProcVersionSignature: Ubuntu 2.6.32-24.43-generic 2.6.32.15+drm33.5
  Uname: Linux 2.6.32-24-generic i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
  Architecture: i386
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jermann-c   2110 F.... pulseaudio
  CRDA: Error: [Errno 2] Aucun fichier ou dossier de ce type
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xfe9fc000 irq 21'
     Mixer name	: 'SigmaTel STAC9205'
     Components	: 'HDA:838476a0,102801f9,00100204 HDA:14f12c06,14f1000f,00100000'
     Controls      : 19
     Simple ctrls  : 11
  Date: Mon Nov 15 11:08:30 2010
  HibernationDevice: RESUME=UUID=8d4f1ec4-764d-4ad5-a6b1-cad44b9861b0
  InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
  MachineType: Dell Inc. Latitude D630
  PackageArchitecture: all
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-24-generic root=UUID=30ea42a4-6eca-4b4f-bc65-2b4e23e79ab4 ro quiet splash
  ProcEnviron:
   PATH=(custom, user)
   LANG=fr_FR.utf8
   SHELL=/bin/bash
  RelatedPackageVersions: linux-firmware 1.34.1
  SourcePackage: linux
  dmi.bios.date: 06/20/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A12
  dmi.board.name: 0KU184
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA12:bd06/20/2008:svnDellInc.:pnLatitudeD630:pvr:rvnDellInc.:rn0KU184:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Latitude D630
  dmi.sys.vendor: Dell Inc.

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