I'm also confirming that the longer tasks is now back to about 135 minutes.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1388276/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
