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https://github.com/xiaonanln/go-skiplist
Skip List implementation in Golang
https://github.com/xiaonanln/go-skiplist
llrb rbtree skiplist
Last synced: 20 days ago
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Skip List implementation in Golang
- Host: GitHub
- URL: https://github.com/xiaonanln/go-skiplist
- Owner: xiaonanln
- License: mit
- Created: 2018-09-08T03:23:10.000Z (over 6 years ago)
- Default Branch: master
- Last Pushed: 2018-09-11T00:58:52.000Z (over 6 years ago)
- Last Synced: 2024-10-15T22:07:03.733Z (2 months ago)
- Topics: llrb, rbtree, skiplist
- Language: Go
- Size: 55.7 KB
- Stars: 4
- Watchers: 3
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# go-skiplist [](https://godoc.org/github.com/xiaonanln/go-skiplist)
Skip List implementation in Golang.
## Installation
`go get github.com/xiaonanln/go-skiplist`
## Overview
SkipList has almost same interface as red-black tree in [github.com/petar/GoLLRB/llrb](https://github.com/petar/GoLLRB).
**Thanks to petar, I used LLRB test files directly, and most test cases just work without modification**
## Performance
Current implementation of SkipList has comparable performance with LLRB, except for `DeleteMin`
which SkipList outperforms LLRB dramatically.
**LLRB:**
```
goos: linux
goarch: amd64
pkg: github.com/petar/GoLLRB/llrb
BenchmarkInsert-32 1000000 1269 ns/op
BenchmarkDelete-32 1000000 1261 ns/op
BenchmarkDeleteMin-32 2000000 800 ns/op
```
**SkipList:**
```
goos: linux
goarch: amd64
pkg: github.com/xiaonanln/go-skiplist
BenchmarkInsert-32 2000000 773 ns/op
BenchmarkDelete-32 3000000 547 ns/op
BenchmarkDeleteMin-32 50000000 27.4 ns/op
```
**Fuzzy Tests**
```
=== RUN TestFuzzyLLRB
--- PASS: TestFuzzyLLRB (19.90s)
=== RUN TestFuzzySkipList
--- PASS: TestFuzzySkipList (12.03s)
=== RUN TestFuzzyHangduSkipList from github.com/huandu/skiplist
--- PASS: TestFuzzyHangduSkipList (12.68s)
```
## RAM consumption
With significant optimization effort, the current RAM consumption of SkipList `(p=0.25)` is more or less same with LLRB.
**LLRB:**
```
Showing nodes accounting for 24.62MB, 99.63% of 24.71MB total
Dropped 62 nodes (cum <= 0.12MB)
flat flat% sum% cum cum%
21.10MB 85.39% 85.39% 21.10MB 85.39% github.com/petar/GoLLRB/llrb.newNode (inline)
3.52MB 14.23% 99.63% 24.62MB 99.63% github.com/xiaonanln/go-skiplist.TestMemoryLLRB
0 0% 99.63% 21.10MB 85.39% github.com/petar/GoLLRB/llrb.(*LLRB).ReplaceOrInsert
0 0% 99.63% 21.10MB 85.39% github.com/petar/GoLLRB/llrb.(*LLRB).replaceOrInsert
```
**SkipList with probability `p = 0.25`:**
```
Showing nodes accounting for 23.07MB, 98.96% of 23.31MB total
Dropped 71 nodes (cum <= 0.12MB)
flat flat% sum% cum cum%
13.56MB 58.15% 58.15% 13.56MB 58.15% github.com/xiaonanln/go-skiplist.glob..func1
4.52MB 19.38% 77.53% 23.21MB 99.56% github.com/xiaonanln/go-skiplist.TestMemorySkipList
3.39MB 14.55% 92.08% 3.39MB 14.55% github.com/xiaonanln/go-skiplist.glob..func2
1.27MB 5.45% 97.53% 1.27MB 5.45% github.com/xiaonanln/go-skiplist.glob..func3
0.32MB 1.35% 98.88% 0.32MB 1.35% github.com/xiaonanln/go-skiplist.glob..func4
0.02MB 0.075% 98.96% 18.69MB 80.17% github.com/xiaonanln/go-skiplist.(*SkipList).ReplaceOrInsert
0 0% 98.96% 18.67MB 80.10% github.com/xiaonanln/go-skiplist.allocNode
```