touch-packages team mailing list archive

[Karl-Philipp Richter <krichter722@xxxxxx>]

Public bug reported:

During defragmentation of a 5 TB ext4 filesystem with one 600 GB file
with current value of 300000 and optimal value of 300 shown by `e4defrag
-c`, `e4defrag' seems to suffer from a huge CPU performance bottleneck.
Over hours only one CPU core is used (-> no parallelization) and there's
almost no I/O during that time <1 % of the underlying device's
capabilities.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: e2fsprogs 1.42.10-1.1ubuntu1
Uname: Linux 3.17.4-031704-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Dec  2 16:29:12 2014
SourcePackage: e2fsprogs
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: e2fsprogs (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug utopic

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https://bugs.launchpad.net/bugs/1398434

Title:
  e4defrag has fatal CPU performance bottleneck

Status in e2fsprogs package in Ubuntu:
  New

Bug description:
  During defragmentation of a 5 TB ext4 filesystem with one 600 GB file
  with current value of 300000 and optimal value of 300 shown by
  `e4defrag -c`, `e4defrag' seems to suffer from a huge CPU performance
  bottleneck. Over hours only one CPU core is used (-> no
  parallelization) and there's almost no I/O during that time <1 % of
  the underlying device's capabilities.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: e2fsprogs 1.42.10-1.1ubuntu1
  Uname: Linux 3.17.4-031704-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Dec  2 16:29:12 2014
  SourcePackage: e2fsprogs
  UpgradeStatus: No upgrade log present (probably fresh install)

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