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["Emmanuel Stapf \[ES\]" <manus@xxxxxxxxxx>]

apport information

** Attachment added: "UdevLog.txt"
   https://bugs.launchpad.net/bugs/1388276/+attachment/4250625/+files/UdevLog.txt

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https://bugs.launchpad.net/bugs/1388276

Title:
  14.10 about 2 to 3 times slower to perform concurrent tasks

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I've just upgraded two servers to use 14.10 (they were before at 14.04) and found that my builds were taking much longer:
  - A jenkins regression test suite that took about 135 minutes is now taking about 300 minutes.
  - A C complation tasks  which took the following amount of time (time from tcsh):
   419.633u 9.471s 1:36.78 443.3%  0+0k 0+166968io 0pf+0w
  is now taking
   519.637u 11.022s 4:42.80 187.6% 0+0k 0+176216io 0pf+0w

  Both tasks are heavily using all the available cores of the processor.
  In one case it is a dual socket E5420 ( 8 cores), in another case it
  is a virtualized 8 cores E5645.

  I first thought it could be the new version of gcc (4.9) since both
  tasks involves a lot of C compilation. Although gcc 4.9 is slower (3s
  vs 2.8s in my own tests) it is not enough to explain the difference. I
  actually also tried using gcc 4.8 and 4.7 with the same performance
  degradation.

  I unfortunately do not have a 14.04 server to which I can compare the
  results to see where the difference is in terms of performance.

  Is anyone observing the same behavior?
  --- 
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  CRDA: Error: [Errno 2] No such file or directory
  DistroRelease: Ubuntu 14.10
  HibernationDevice: RESUME=UUID=9a90cb5e-bce2-49fc-8c26-8f3d23bce997
  InstallationDate: Installed on 2012-05-15 (899 days ago)
  InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Release amd64 (20120424.1)
  IwConfig:
   eth0      no wireless extensions.
   
   eth1      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  Package: linux (not installed)
  PciMultimedia:
   
  ProcEnviron:
   TERM=vt100
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C
   SHELL=/usr/bin/tcsh
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-37-generic root=UUID=14f555da-6c91-4091-9976-f16962890c86 ro
  ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-37-generic N/A
   linux-backports-modules-3.13.0-37-generic  N/A
   linux-firmware                             1.138
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  utopic utopic
  Uname: Linux 3.13.0-37-generic x86_64
  UnreportableReason: The report belongs to a package that is not installed.
  UpgradeStatus: Upgraded to utopic on 2014-10-28 (3 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 12/13/2007
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: 1004
  dmi.board.name: DSBF-DE
  dmi.board.vendor: ASUSTek Computer Inc.
  dmi.board.version: REV : 1.xxG
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 1
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr1004:bd12/13/2007:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTekComputerInc.:rnDSBF-DE:rvrREV1.xxG:cvnChassisManufacture:ct1:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer
  --- 
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  CRDA: Error: [Errno 2] No such file or directory
  DistroRelease: Ubuntu 14.10
  HibernationDevice: RESUME=UUID=9a90cb5e-bce2-49fc-8c26-8f3d23bce997
  InstallationDate: Installed on 2012-05-15 (899 days ago)
  InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Release amd64 (20120424.1)
  IwConfig:
   eth0      no wireless extensions.
   
   eth1      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  Package: linux (not installed)
  PciMultimedia:
   
  ProcEnviron:
   TERM=vt100
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C
   SHELL=/usr/bin/tcsh
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-23-generic root=UUID=14f555da-6c91-4091-9976-f16962890c86 ro
  ProcVersionSignature: Ubuntu 3.16.0-23.31-generic 3.16.4
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-23-generic N/A
   linux-backports-modules-3.16.0-23-generic  N/A
   linux-firmware                             1.138
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  utopic
  Uname: Linux 3.16.0-23-generic x86_64
  UpgradeStatus: Upgraded to utopic on 2014-10-28 (3 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 12/13/2007
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: 1004
  dmi.board.name: DSBF-DE
  dmi.board.vendor: ASUSTek Computer Inc.
  dmi.board.version: REV : 1.xxG
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 1
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr1004:bd12/13/2007:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTekComputerInc.:rnDSBF-DE:rvrREV1.xxG:cvnChassisManufacture:ct1:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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