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Updated version of klauspost/reedsolomon with NEON support for ARM (#4865)

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Frank Wessels
2017-08-30 09:49:00 -07:00
committed by Dee Koder
parent 6dca044ea8
commit 93f126364e
10 changed files with 1143 additions and 15 deletions
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vendor/github.com/klauspost/reedsolomon/README.md generated vendored
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@@ -8,7 +8,7 @@
Reed-Solomon Erasure Coding in Go, with speeds exceeding 1GB/s/cpu core implemented in pure Go.
This is a golang port of the [JavaReedSolomon](https://github.com/Backblaze/JavaReedSolomon) library released by [Backblaze](http://backblaze.com), with some additional optimizations.
This is a Go port of the [JavaReedSolomon](https://github.com/Backblaze/JavaReedSolomon) library released by [Backblaze](http://backblaze.com), with some additional optimizations.
For an introduction on erasure coding, see the post on the [Backblaze blog](https://www.backblaze.com/blog/reed-solomon/).
@@ -19,11 +19,17 @@ Godoc: https://godoc.org/github.com/klauspost/reedsolomon
# Installation
To get the package use the standard:
```bash
go get github.com/klauspost/reedsolomon
go get -u github.com/klauspost/reedsolomon
```
# Changes
## August 26, 2017
* The[`Encoder()`](https://godoc.org/github.com/klauspost/reedsolomon#Encoder) now contains an `Update` function contributed by [chenzhongtao](https://github.com/chenzhongtao).
* [Frank Wessels](https://github.com/fwessels) kindly contributed ARM 64 bit assembly, which gives a huge performance boost on this platform.
## July 20, 2017
`ReconstructData` added to [`Encoder`](https://godoc.org/github.com/klauspost/reedsolomon#Encoder) interface. This can cause compatibility issues if you implement your own Encoder. A simple workaround can be added:
@@ -186,7 +192,7 @@ There is no buffering or timeouts/retry specified. If you want to add that, you
For complete examples of a streaming encoder and decoder see the [examples folder](https://github.com/klauspost/reedsolomon/tree/master/examples).
#Advanced Options
# Advanced Options
You can modify internal options which affects how jobs are split between and processed by goroutines.
@@ -234,6 +240,16 @@ BenchmarkReconstruct50x20x1M-8 1364.35 4189.79 3.07x
BenchmarkReconstruct10x4x16M-8 1484.35 5779.53 3.89x
```
# Performance on ARM64 NEON
By exploiting NEON instructions the performance for ARM has been accelerated. Below are the performance numbers for a single core on an ARM Cortex-A53 CPU @ 1.2GHz (Debian 8.0 Jessie running Go: 1.7.4):
| Data | Parity | Parity | ARM64 Go MB/s | ARM64 NEON MB/s | NEON Speed |
|------|--------|--------|--------------:|----------------:|-----------:|
| 5 | 2 | 40% | 189 | 1304 | 588% |
| 10 | 2 | 20% | 188 | 1738 | 925% |
| 10 | 4 | 40% | 96 | 839 | 877% |
# asm2plan9s
[asm2plan9s](https://github.com/fwessels/asm2plan9s) is used for assembling the AVX2 instructions into their BYTE/WORD/LONG equivalents.