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TESTS.md

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This file documents how to use test.py and how performance numbers calculated.

mkfs.btrfs /dev/xvdc
mount /dev/xvdc /mnt
python test.py -d /mnt

Above should create test data on /mnt. This will create files in specific layout format fn_<file_datalayout>_<segment_size>_<total_file_size>. For example, "fn_abcd_1m_4m" refers to 4mb file with 1mb of a,b,c and d. i.e first 1mb is a, second 1mb is b, third 1mb is c and fourth 1mb is d.

Test run results:

All three mode saved same amount of data. Original data:

/dev/xvdc      104857600 16626016  87204352  17% /mnt

After dedupe:

/dev/xvdc      104857600   26880 103787776   1% /mnt
  1. Running in default mode:
dduper --device /dev/xvdc --dir /mnt --chunk-size 1024

dduper took 2245.63775706 seconds
  1. Running in fast mode:
dduper --fast-mode --device /dev/xvdc --dir /mnt --chunk-size 1024

dduper took 265.656284094 seconds
  1. Running insane mode.
dduper --fast-mode --skip --device /dev/xvdc --dir /mnt --chunk-size 1024 --recurse

dduper took 3.16962099075 seconds