mirror of https://github.com/status-im/consul.git
revert to previous circonusllhist
This commit is contained in:
matt maier
parent
91a8b43d5a
commit
95390cd9dc
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@ -15,7 +15,7 @@ import (
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)
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const (
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DEFAULT_HIST_SIZE = uint16(100)
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DEFAULT_HIST_SIZE = int16(100)
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)
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var power_of_ten = [...]float64{
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@ -70,14 +70,6 @@ func NewBinFromFloat64(d float64) *Bin {
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hb.SetFromFloat64(d)
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return hb
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}
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type FastL2 struct {
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l1, l2 int
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}
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func (hb *Bin) fastl2() FastL2 {
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return FastL2{l1: int(uint8(hb.exp)), l2: int(uint8(hb.val))}
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}
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func (hb *Bin) SetFromFloat64(d float64) *Bin {
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hb.val = -1
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if math.IsInf(d, 0) || math.IsNaN(d) {
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@ -125,7 +117,10 @@ func (hb *Bin) SetFromFloat64(d float64) *Bin {
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return hb
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}
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func (hb *Bin) PowerOfTen() float64 {
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idx := int(uint8(hb.exp))
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idx := int(hb.exp)
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if idx < 0 {
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idx = 256 + idx
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}
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return power_of_ten[idx]
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}
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@ -188,58 +183,69 @@ func (hb *Bin) Left() float64 {
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}
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func (h1 *Bin) Compare(h2 *Bin) int {
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var v1, v2 int
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// slide exp positive,
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// shift by size of val
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// multiple by (val != 0)
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// then add or subtract val accordingly
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if h1.val >= 0 {
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v1 = ((int(h1.exp)+256)<<8)*int(((h1.val|(^h1.val+1))>>8)&1) + int(h1.val)
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} else {
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v1 = ((int(h1.exp)+256)<<8)*int(((h1.val|(^h1.val+1))>>8)&1) - int(h1.val)
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if h1.val == h2.val && h1.exp == h2.exp {
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return 0
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}
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if h2.val >= 0 {
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v2 = ((int(h2.exp)+256)<<8)*int(((h2.val|(^h2.val+1))>>8)&1) + int(h2.val)
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} else {
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v2 = ((int(h2.exp)+256)<<8)*int(((h2.val|(^h2.val+1))>>8)&1) - int(h2.val)
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if h1.val == -1 {
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return 1
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}
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// return the difference
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return v2 - v1
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if h2.val == -1 {
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return -1
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}
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if h1.val == 0 {
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if h2.val > 0 {
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return 1
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}
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return -1
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}
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if h2.val == 0 {
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if h1.val < 0 {
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return 1
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}
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return -1
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}
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if h1.val < 0 && h2.val > 0 {
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return 1
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}
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if h1.val > 0 && h2.val < 0 {
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return -1
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}
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if h1.exp == h2.exp {
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if h1.val < h2.val {
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return 1
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}
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return -1
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}
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if h1.exp > h2.exp {
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if h1.val < 0 {
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return 1
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}
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return -1
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}
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if h1.exp < h2.exp {
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if h1.val < 0 {
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return -1
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}
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return 1
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}
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return 0
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}
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// This histogram structure tracks values are two decimal digits of precision
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// with a bounded error that remains bounded upon composition
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type Histogram struct {
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mutex sync.Mutex
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bvs []Bin
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used uint16
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allocd uint16
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lookup [256][]uint16
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mutex sync.Mutex
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useLocks bool
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used int16
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allocd int16
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}
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// New returns a new Histogram
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func New() *Histogram {
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return &Histogram{
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allocd: DEFAULT_HIST_SIZE,
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used: 0,
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bvs: make([]Bin, DEFAULT_HIST_SIZE),
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useLocks: true,
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}
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}
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// New returns a Histogram without locking
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func NewNoLocks() *Histogram {
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return &Histogram{
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allocd: DEFAULT_HIST_SIZE,
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used: 0,
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bvs: make([]Bin, DEFAULT_HIST_SIZE),
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useLocks: false,
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allocd: DEFAULT_HIST_SIZE,
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used: 0,
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bvs: make([]Bin, DEFAULT_HIST_SIZE),
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}
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}
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@ -260,24 +266,9 @@ func (h *Histogram) Mean() float64 {
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// Reset forgets all bins in the histogram (they remain allocated)
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func (h *Histogram) Reset() {
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if h.useLocks {
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h.mutex.Lock()
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defer h.mutex.Unlock()
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}
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for i := 0; i < 256; i++ {
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if h.lookup[i] != nil {
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for j := range h.lookup[i] {
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h.lookup[i][j] = 0
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}
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}
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}
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h.mutex.Lock()
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h.used = 0
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}
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// RecordIntScale records an integer scaler value, returning an error if the
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// value is out of range.
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func (h *Histogram) RecordIntScale(val, scale int) error {
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return h.RecordIntScales(val, scale, 1)
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h.mutex.Unlock()
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}
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// RecordValue records the given value, returning an error if the value is out
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@ -313,19 +304,13 @@ func (h *Histogram) RecordCorrectedValue(v, expectedInterval int64) error {
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}
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// find where a new bin should go
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func (h *Histogram) InternalFind(hb *Bin) (bool, uint16) {
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func (h *Histogram) InternalFind(hb *Bin) (bool, int16) {
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if h.used == 0 {
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return false, 0
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}
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f2 := hb.fastl2()
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if h.lookup[f2.l1] != nil {
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if idx := h.lookup[f2.l1][f2.l2]; idx != 0 {
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return true, idx - 1
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}
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}
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rv := -1
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idx := uint16(0)
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l := uint16(0)
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idx := int16(0)
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l := int16(0)
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r := h.used - 1
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for l < r {
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check := (r + l) / 2
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@ -354,9 +339,10 @@ func (h *Histogram) InternalFind(hb *Bin) (bool, uint16) {
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}
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func (h *Histogram) InsertBin(hb *Bin, count int64) uint64 {
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if h.useLocks {
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h.mutex.Lock()
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defer h.mutex.Unlock()
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h.mutex.Lock()
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defer h.mutex.Unlock()
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if count == 0 {
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return 0
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}
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found, idx := h.InternalFind(hb)
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if !found {
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@ -377,20 +363,13 @@ func (h *Histogram) InsertBin(hb *Bin, count int64) uint64 {
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h.bvs[idx].exp = hb.exp
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h.bvs[idx].count = uint64(count)
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h.used++
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for i := idx; i < h.used; i++ {
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f2 := h.bvs[i].fastl2()
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if h.lookup[f2.l1] == nil {
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h.lookup[f2.l1] = make([]uint16, 256)
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}
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h.lookup[f2.l1][f2.l2] = uint16(i) + 1
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}
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return h.bvs[idx].count
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}
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var newval uint64
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if count >= 0 {
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newval = h.bvs[idx].count + uint64(count)
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} else {
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if count < 0 {
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newval = h.bvs[idx].count - uint64(-count)
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} else {
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newval = h.bvs[idx].count + uint64(count)
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}
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if newval < h.bvs[idx].count { //rolled
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newval = ^uint64(0)
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@ -399,39 +378,6 @@ func (h *Histogram) InsertBin(hb *Bin, count int64) uint64 {
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return newval - h.bvs[idx].count
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}
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// RecordIntScales records n occurrences of the given value, returning an error if
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// the value is out of range.
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func (h *Histogram) RecordIntScales(val, scale int, n int64) error {
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sign := 1
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if val == 0 {
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scale = 0
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} else {
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if val < 0 {
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val = 0 - val
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sign = -1
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}
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if val < 10 {
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val *= 10
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scale -= 1
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}
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for val > 100 {
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val /= 10
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scale++
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}
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}
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if scale < -128 {
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val = 0
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scale = 0
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} else if scale > 127 {
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val = 0xff
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scale = 0
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}
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val *= sign
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hb := Bin{val: int8(val), exp: int8(scale), count: 0}
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h.InsertBin(&hb, n)
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return nil
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}
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// RecordValues records n occurrences of the given value, returning an error if
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// the value is out of range.
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func (h *Histogram) RecordValues(v float64, n int64) error {
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@ -443,13 +389,11 @@ func (h *Histogram) RecordValues(v float64, n int64) error {
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// Approximate mean
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func (h *Histogram) ApproxMean() float64 {
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if h.useLocks {
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h.mutex.Lock()
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defer h.mutex.Unlock()
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}
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h.mutex.Lock()
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defer h.mutex.Unlock()
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divisor := 0.0
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sum := 0.0
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for i := uint16(0); i < h.used; i++ {
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for i := int16(0); i < h.used; i++ {
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midpoint := h.bvs[i].Midpoint()
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cardinality := float64(h.bvs[i].count)
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divisor += cardinality
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@ -463,12 +407,10 @@ func (h *Histogram) ApproxMean() float64 {
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// Approximate sum
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func (h *Histogram) ApproxSum() float64 {
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if h.useLocks {
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h.mutex.Lock()
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defer h.mutex.Unlock()
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}
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h.mutex.Lock()
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defer h.mutex.Unlock()
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sum := 0.0
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for i := uint16(0); i < h.used; i++ {
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for i := int16(0); i < h.used; i++ {
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midpoint := h.bvs[i].Midpoint()
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cardinality := float64(h.bvs[i].count)
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sum += midpoint * cardinality
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@ -477,12 +419,10 @@ func (h *Histogram) ApproxSum() float64 {
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}
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func (h *Histogram) ApproxQuantile(q_in []float64) ([]float64, error) {
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if h.useLocks {
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h.mutex.Lock()
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defer h.mutex.Unlock()
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}
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h.mutex.Lock()
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defer h.mutex.Unlock()
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q_out := make([]float64, len(q_in))
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i_q, i_b := 0, uint16(0)
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i_q, i_b := 0, int16(0)
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total_cnt, bin_width, bin_left, lower_cnt, upper_cnt := 0.0, 0.0, 0.0, 0.0, 0.0
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if len(q_in) == 0 {
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return q_out, nil
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@ -545,10 +485,8 @@ func (h *Histogram) ApproxQuantile(q_in []float64) ([]float64, error) {
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// ValueAtQuantile returns the recorded value at the given quantile (0..1).
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func (h *Histogram) ValueAtQuantile(q float64) float64 {
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if h.useLocks {
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h.mutex.Lock()
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defer h.mutex.Unlock()
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}
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h.mutex.Lock()
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defer h.mutex.Unlock()
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q_in := make([]float64, 1)
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q_in[0] = q
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q_out, err := h.ApproxQuantile(q_in)
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@ -567,20 +505,16 @@ func (h *Histogram) SignificantFigures() int64 {
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// Equals returns true if the two Histograms are equivalent, false if not.
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func (h *Histogram) Equals(other *Histogram) bool {
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if h.useLocks {
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h.mutex.Lock()
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defer h.mutex.Unlock()
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}
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if other.useLocks {
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other.mutex.Lock()
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defer other.mutex.Unlock()
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}
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h.mutex.Lock()
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other.mutex.Lock()
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defer h.mutex.Unlock()
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defer other.mutex.Unlock()
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switch {
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case
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h.used != other.used:
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return false
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default:
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for i := uint16(0); i < h.used; i++ {
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for i := int16(0); i < h.used; i++ {
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if h.bvs[i].Compare(&other.bvs[i]) != 0 {
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return false
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}
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@ -593,10 +527,8 @@ func (h *Histogram) Equals(other *Histogram) bool {
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}
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func (h *Histogram) CopyAndReset() *Histogram {
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if h.useLocks {
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h.mutex.Lock()
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defer h.mutex.Unlock()
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}
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h.mutex.Lock()
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defer h.mutex.Unlock()
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newhist := &Histogram{
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allocd: h.allocd,
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used: h.used,
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@ -605,20 +537,11 @@ func (h *Histogram) CopyAndReset() *Histogram {
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h.allocd = DEFAULT_HIST_SIZE
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h.bvs = make([]Bin, DEFAULT_HIST_SIZE)
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h.used = 0
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for i := 0; i < 256; i++ {
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if h.lookup[i] != nil {
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for j := range h.lookup[i] {
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h.lookup[i][j] = 0
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}
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}
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}
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return newhist
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}
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func (h *Histogram) DecStrings() []string {
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if h.useLocks {
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h.mutex.Lock()
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defer h.mutex.Unlock()
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}
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h.mutex.Lock()
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defer h.mutex.Unlock()
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out := make([]string, h.used)
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for i, bin := range h.bvs[0:h.used] {
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var buffer bytes.Buffer
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@ -238,10 +238,10 @@
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"revisionTime": "2016-11-09T19:23:37Z"
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},
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{
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"checksumSHA1": "eYWKyMvUWZpmuXjDEIGy9lBddK0=",
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"checksumSHA1": "C4Z7+l5GOpOCW5DcvNYzheGvQRE=",
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"path": "github.com/circonus-labs/circonusllhist",
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"revision": "f3bb61c09a65a1bb5833219937fe4e7042dadab4",
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"revisionTime": "2016-11-09T20:01:07Z"
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"revision": "365d370cc1459bdcaceda3499453668373dea1d0",
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"revisionTime": "2016-11-10T00:26:50Z"
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},
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{
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"checksumSHA1": "fXAinpJ5bOcborK7AiO1rnW60BI=",
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