Olaoluwa Osuntokun
d3e82fcd5d
gcs: switch basic filter to index prev output scripts of all inputs
2018-07-06 17:32:55 -05:00
Olaoluwa Osuntokun
0ecd90b8d6
gcs: update fp and modulus values based on recent optimality analysis
...
In this commit, we decrease the default fp rate to 19, or 1/2^19. We do
this as recent analysis by sipa on the bitcoin dev mailing list has
shown that optimally, we can use a value of 2^19 for the fp rate, while
use n=1.497137*2^P rather than n directly. As a result, we can shrink
the filter size by quite a bit, while still maintaining a sane false
positive value.
2018-07-06 17:32:55 -05:00
Olaoluwa Osuntokun
45edb4b6e5
gcs: fix stray import
2018-05-22 17:48:27 -07:00
Jim Posen
cbc2d0fee6
Allow construction of empty filters.
2018-05-15 19:14:18 -07:00
Jim Posen
884680ddbd
Serialize filter with N as a VarInt instead of fixed-size.
2018-05-15 19:14:18 -07:00
Olaoluwa Osuntokun
54b6d534d2
gcs: extract fast reduce into distinct func, add comments
2018-05-15 19:14:18 -07:00
Alex
dabaf053db
gcs: update modulo algorithm to fast range per gmaxwell's suggestion
...
The BIP will now specify that the fast range described at the URL
below is used instead of modulo:
https://lemire.me/blog/2016/06/27/a-fast-alternative-to-the-modulo-reduction/
2018-05-15 19:14:18 -07:00
Olaoluwa Osuntokun
e14ee486e6
gcs: fix constant overflow for 32-bit systems
2018-05-15 19:14:18 -07:00
Olaoluwa Osuntokun
18097a52c4
gcs: explicitly optimize inner loop of gcs filter computation
2018-05-15 19:14:18 -07:00
Olaoluwa Osuntokun
c59d7e8fba
gcs: pre-allocate capacity of slice for uncompressed filter values
...
This change will reduce the total number of allocations required to
create/store the allocated filter as we’ll now perform a _single_
allocation, rather than one each time the the dynamically size slice
reaches capacity.
2018-05-15 19:14:18 -07:00
Olaoluwa Osuntokun
0f2eb80fdb
gcs: add some line spacing, wrap comments to 80 characters
2018-05-15 19:14:18 -07:00
Alex
f74edf2c4d
gcs: allow optional de/serialization of N and P parameters
2018-05-15 19:14:18 -07:00
Alex
b21739c0e2
Fix issues found by golint without changing API.
2018-05-15 19:14:18 -07:00
Alex
684cf07725
Rename gcsFilter type to GCSFilter to export it.
2018-05-15 19:14:18 -07:00
Alex
3069dcf175
gcs: add package for building and using Golomb-coded set filters
2018-05-15 19:14:18 -07:00
