Comments (2)
The motivation of this crate is to quickly sort suffix array of binary data in memory and use as less memory as possible. However, burntsushi's suffix is for indexing utf-8 encoded text. Since utf-8 is a variable width encoding, performances of these two crates were not that comparable.
I was woking on implementing a better bsdiff months before, which quite need a mordern suffix array construction algorithm. Util I started this work, there was no such rust crate that could meet my requisitions (for now, there is divsufsort
ported by Amos Wenger, which is more recommended).
Therefore, I implemented a partially paralleled SACA, which uses O(1)
additional memory and runs in O(n)
time (qsufsort
in Colin Percival's original bsdiff 4.3 is O(n)
additional memory & O(n*log(n))
worst time).
AFAIK, speed of this crate is usually 1.3x-1.7x faster than burntsushi's suffix
, but 2x-3x slower than Yuta Mori's dissufsort in C and Amos Wenger's hand-ported divsufsort in rust. The testing code and result was listed here. For people who launches new projects relating to binary data indexing, the new rust-bindings for divsufsort
by Amos Wenger is preferred.
I am planned to try another implementation of SACA, or just simply replace the current implementation with Amos Wenger's work in later versions. I would like to add some explainations to README.
TL;DR: suffix_array
runs faster than burntsushi's suffix
. But it is not suitable to compare them in this way, because suffix
handles utf-8 input while suffix_array
does not. For people who need indexing utf-8 encoded texts, it is recommend to use burntsushi's suffix
.
from suffix_array.
Thanks! It would be great to put the TL;DR in the README.
from suffix_array.
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from suffix_array.