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0.9.2, updated README and benchmarks

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This commit is contained in:
Lukasz Langa 2016-11-01 12:02:34 -07:00
parent 7cf1577be7
commit 58aa762e5c
2 changed files with 28 additions and 8 deletions

32
README.rst

@ -27,15 +27,32 @@ a folder after moving it to another drive.
Performance
-----------
Obviously depends on how fast the underlying drive is. No rigorous
performance tests have been done. For informational purposes, a typical
5400 RPM laptop hard drive scanning a 60+ GB music library takes around
15 minutes. On an OCZ Vertex 3 SSD drive ``bitrot`` is able to scan
a 100 GB Aperture library in under 10 minutes. Both tests on HFS+.
Obviously depends on how fast the underlying drive is. Since bandwidth
for checksum calculations is greater than your drive's data transfer
rate, even when comparing mobile CPUs vs. SSD drives, the script is
single-threaded.
No rigorous performance tests have been done. Scanning a ~1000 files
totalling ~4 GB takes 20 seconds on a 2015 Macbook Air (SM0256G SSD).
This is with cold disk cache.
Some other tests back from 2013: a typical 5400 RPM laptop hard drive
scanning a 60+ GB music library took around 15 minutes. On an OCZ
Vertex 3 SSD drive ``bitrot`` was able to scan a 100 GB Aperture library
in under 10 minutes. Both tests on HFS+.
If you'd like to contribute some more rigorous eenchmarks or any
performance improvements, I'm accepting pull requests! :)
Change Log
----------
0.9.2
~~~~~
* bugfix: one place in the code incorrectly hardcoded UTF-8 as the
filesystem encoding
0.9.1
~~~~~
@ -155,4 +172,7 @@ Authors
Glued together by `Łukasz Langa <mailto:lukasz@langa.pl>`_. Multiple
improvements by `Yang Zhang <mailto:yaaang@gmail.com>`_, `Jean-Louis
Fuchs <mailto:ganwell@fangorn.ch>`_ and `Phil Lundrigan <mailto:philipbl@cs.utah.edu>`_.
Fuchs <mailto:ganwell@fangorn.ch>`_, `Phil Lundrigan
<mailto:philipbl@cs.utah.edu>`_, `Ben Shepherd
<mailto:bjashepherd@gmail.com`, and `Peter Hofmann
<mailto:scm@uninformativ.de>`_.

4
src/bitrot.py

@ -40,9 +40,9 @@ import tempfile
import time
DEFAULT_CHUNK_SIZE = 16384
DEFAULT_CHUNK_SIZE = 16384 # block size in HFS+; 4X the block size in ext4
DOT_THRESHOLD = 200
VERSION = (0, 9, 1)
VERSION = (0, 9, 2)
IGNORED_FILE_SYSTEM_ERRORS = {errno.ENOENT, errno.EACCES}
FSENCODING = sys.getfilesystemencoding()