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On this page I intend to write down my understanding of how btrfs handles extents on disk and how they can be re-read to build up enough state to count extent references. Most of this I learned as I worked ...
  • Last updated
    on Oct 1, 2016

Duperemove Design 3-steps of operation Duperemove has 3 primary phases of operation, each of which feeds data into the next. Almost all duperemove command line options either change which steps are executed ...
  • Last updated
    on Sep 30, 2016

Here are some numbers I got running against the same dataset with sha256 (gcrypt), xxhash and murmur3 from the hashes-update branch . Each run came up with the same total number of unique hashes, which ...
  • Last updated
    on Nov 25, 2014

With this page I want to provide some example performance numbers so users have an idea of what to expect when they run duperemove on non-trivial data sets. The following tests were run on a Dell Precision ...
  • Last updated
    on Oct 9, 2015

Here are some sample performance numbers for Duperemove v0.10. See this page for Duperemove v0.09 numbers With this page I want to provide some example performance numbers so users have an idea of what ...
  • Last updated
    on Aug 15, 2016

Here are some sample performance numbers for Duperemove v0.11. See this page for Duperemove v0.10 numbers The tests are run on a Dell Precision T3610 workstation. You can find more information about the ...
  • Last updated
    on Jan 22, 2023

Measuring overall duperemove performance The simplest way to test duperemove performance is to run it, being careful to pipe all output to /dev/null. time duperemove -rd /btrfs & > /dev/null real ...
  • Last updated
    on Nov 14, 2014

Kernel/Distribution weyoun2:~ # cat /etc/SuSE-release openSUSE 13.1 (x86_64) VERSION = 13.1 CODENAME = Bottle weyoun2:~ # uname -a Linux weyoun2 3.17.0-rc7 #52 SMP Mon Sep 29 22:36:10 PDT 2014 x86_64 ...
  • Last updated
    on Nov 14, 2014

This is preliminary and just some notes. Obviously we want a list of tests and benchmarks. duperemove-tests is an extremely basic start Update the performance page on wiki If time, add block dedupe performance ...
  • Last updated
    on Sep 27, 2016

New file format design Actually I'd like to move to sqlite for storing hashes. It supports caching, random I/O (obviously), is extensible an a well known project. I don't want to implement most ...
  • Last updated
    on Apr 27, 2015