mirror of https://gogs.blitter.com/RLabs/xs
119 lines
3.0 KiB
Go
119 lines
3.0 KiB
Go
package reedsolomon
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import (
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"runtime"
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"github.com/klauspost/cpuid"
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)
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// Option allows to override processing parameters.
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type Option func(*options)
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type options struct {
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maxGoroutines int
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minSplitSize int
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useAVX512, useAVX2, useSSSE3, useSSE2 bool
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usePAR1Matrix bool
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useCauchy bool
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shardSize int
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}
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var defaultOptions = options{
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maxGoroutines: 384,
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minSplitSize: 1024,
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}
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func init() {
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if runtime.GOMAXPROCS(0) <= 1 {
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defaultOptions.maxGoroutines = 1
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}
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// Detect CPU capabilities.
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defaultOptions.useSSSE3 = cpuid.CPU.SSSE3()
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defaultOptions.useSSE2 = cpuid.CPU.SSE2()
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defaultOptions.useAVX2 = cpuid.CPU.AVX2()
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defaultOptions.useAVX512 = cpuid.CPU.AVX512F() && cpuid.CPU.AVX512BW() && amd64
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}
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// WithMaxGoroutines is the maximum number of goroutines number for encoding & decoding.
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// Jobs will be split into this many parts, unless each goroutine would have to process
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// less than minSplitSize bytes (set with WithMinSplitSize).
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// For the best speed, keep this well above the GOMAXPROCS number for more fine grained
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// scheduling.
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// If n <= 0, it is ignored.
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func WithMaxGoroutines(n int) Option {
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return func(o *options) {
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if n > 0 {
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o.maxGoroutines = n
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}
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}
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}
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// WithAutoGoroutines will adjust the number of goroutines for optimal speed with a
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// specific shard size.
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// Send in the shard size you expect to send. Other shard sizes will work, but may not
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// run at the optimal speed.
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// Overwrites WithMaxGoroutines.
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// If shardSize <= 0, it is ignored.
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func WithAutoGoroutines(shardSize int) Option {
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return func(o *options) {
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o.shardSize = shardSize
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}
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}
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// WithMinSplitSize is the minimum encoding size in bytes per goroutine.
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// See WithMaxGoroutines on how jobs are split.
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// If n <= 0, it is ignored.
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func WithMinSplitSize(n int) Option {
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return func(o *options) {
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if n > 0 {
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o.minSplitSize = n
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}
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}
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}
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func withSSE3(enabled bool) Option {
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return func(o *options) {
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o.useSSSE3 = enabled
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}
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}
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func withAVX2(enabled bool) Option {
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return func(o *options) {
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o.useAVX2 = enabled
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}
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}
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func withSSE2(enabled bool) Option {
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return func(o *options) {
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o.useSSE2 = enabled
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}
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}
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func withAVX512(enabled bool) Option {
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return func(o *options) {
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o.useAVX512 = enabled
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}
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}
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// WithPAR1Matrix causes the encoder to build the matrix how PARv1
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// does. Note that the method they use is buggy, and may lead to cases
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// where recovery is impossible, even if there are enough parity
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// shards.
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func WithPAR1Matrix() Option {
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return func(o *options) {
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o.usePAR1Matrix = true
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o.useCauchy = false
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}
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}
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// WithCauchyMatrix will make the encoder build a Cauchy style matrix.
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// The output of this is not compatible with the standard output.
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// A Cauchy matrix is faster to generate. This does not affect data throughput,
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// but will result in slightly faster start-up time.
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func WithCauchyMatrix() Option {
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return func(o *options) {
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o.useCauchy = true
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o.usePAR1Matrix = false
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}
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}
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