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|
package statsengine
import (
"cmp"
"container/heap"
"slices"
"ior/internal/event"
"ior/internal/types"
)
const fileRankTopNDefault = 20
type fileRanker struct {
topN int
maxSeen int
byPath map[string]*fileRankStats
topHeap fileRankHeap
}
type fileRankStats struct {
path string
accesses uint64
bytesRead uint64
bytesWritten uint64
totalLatency uint64
maxLatency uint64
heapIndex int
}
type fileSnapshotInput struct {
path string
accesses uint64
bytesRead uint64
bytesWritten uint64
totalLatency uint64
maxLatency uint64
}
type fileRankHeap []*fileRankStats
func newFileRanker() *fileRanker {
return newFileRankerWithConfig(fileRankTopNDefault)
}
func newFileRankerWithConfig(topN int) *fileRanker {
if topN <= 0 {
topN = fileRankTopNDefault
}
return newFileRankerWithLimits(topN, topN*32)
}
func newFileRankerWithLimits(topN int, maxSeen int) *fileRanker {
if topN <= 0 {
topN = fileRankTopNDefault
}
if maxSeen < topN {
maxSeen = topN
}
r := &fileRanker{
topN: topN,
maxSeen: maxSeen,
byPath: make(map[string]*fileRankStats),
}
heap.Init(&r.topHeap)
return r
}
func (r *fileRanker) Add(pair *event.Pair) {
if r == nil || pair == nil || pair.File == nil {
return
}
path := pair.File.Name()
if path == "" || path == "N:file" {
return
}
stats := r.byPath[path]
if stats == nil {
stats = &fileRankStats{path: path, heapIndex: -1}
r.byPath[path] = stats
}
stats.accesses++
stats.totalLatency += pair.Duration
if pair.Duration > stats.maxLatency {
stats.maxLatency = pair.Duration
}
r.addBytes(stats, pair)
r.updateHeap(stats)
r.compactIfNeeded()
}
func (r *fileRanker) Snapshot() []FileSnapshot {
if r == nil {
return nil
}
return buildFileSnapshots(r.snapshotInputs())
}
func (r *fileRanker) snapshotInputs() []fileSnapshotInput {
if r == nil {
return nil
}
inputs := make([]fileSnapshotInput, 0, len(r.topHeap))
for _, stats := range r.topHeap {
inputs = append(inputs, fileSnapshotInput{
path: stats.path,
accesses: stats.accesses,
bytesRead: stats.bytesRead,
bytesWritten: stats.bytesWritten,
totalLatency: stats.totalLatency,
maxLatency: stats.maxLatency,
})
}
return inputs
}
func buildFileSnapshots(inputs []fileSnapshotInput) []FileSnapshot {
out := make([]FileSnapshot, 0, len(inputs))
for _, in := range inputs {
out = append(out, in.toSnapshot())
}
slices.SortFunc(out, func(a, b FileSnapshot) int {
if a.Accesses != b.Accesses {
return cmp.Compare(b.Accesses, a.Accesses)
}
return cmp.Compare(a.Path, b.Path)
})
return out
}
func (r *fileRanker) addBytes(stats *fileRankStats, pair *event.Pair) {
retEv, ok := pair.ExitEv.(*types.RetEvent)
if !ok {
return
}
switch retEv.RetType {
case types.READ_CLASSIFIED:
stats.bytesRead += pair.Bytes
case types.WRITE_CLASSIFIED:
stats.bytesWritten += pair.Bytes
case types.TRANSFER_CLASSIFIED:
// Transfer syscalls move bytes in both directions from a file-centric view.
stats.bytesRead += pair.Bytes
stats.bytesWritten += pair.Bytes
}
}
func (r *fileRanker) updateHeap(stats *fileRankStats) {
if stats.heapIndex >= 0 {
heap.Fix(&r.topHeap, stats.heapIndex)
return
}
if len(r.topHeap) < r.topN {
heap.Push(&r.topHeap, stats)
return
}
worst := r.topHeap[0]
if !betterFileRank(stats, worst) {
return
}
heap.Pop(&r.topHeap)
heap.Push(&r.topHeap, stats)
}
func (r *fileRanker) compactIfNeeded() {
if len(r.byPath) <= r.maxSeen {
return
}
// Keep only currently top-ranked paths once cardinality crosses the guard.
kept := make(map[string]*fileRankStats, len(r.topHeap))
for _, stats := range r.topHeap {
kept[stats.path] = stats
}
r.byPath = kept
}
func (s fileSnapshotInput) toSnapshot() FileSnapshot {
avg := 0.0
if s.accesses > 0 {
avg = float64(s.totalLatency) / float64(s.accesses)
}
return FileSnapshot{
Path: s.path,
Accesses: s.accesses,
BytesRead: s.bytesRead,
BytesWritten: s.bytesWritten,
AvgLatencyNs: avg,
MaxLatencyNs: s.maxLatency,
}
}
func betterFileRank(a, b *fileRankStats) bool {
if a.accesses != b.accesses {
return a.accesses > b.accesses
}
return a.path < b.path
}
func (h fileRankHeap) Len() int {
return len(h)
}
func (h fileRankHeap) Less(i, j int) bool {
// Keep the worst-ranked item at root for O(log N) eviction.
return betterFileRank(h[j], h[i])
}
func (h fileRankHeap) Swap(i, j int) {
h[i], h[j] = h[j], h[i]
h[i].heapIndex = i
h[j].heapIndex = j
}
func (h *fileRankHeap) Push(x any) {
stats := x.(*fileRankStats)
stats.heapIndex = len(*h)
*h = append(*h, stats)
}
func (h *fileRankHeap) Pop() any {
old := *h
n := len(old)
stats := old[n-1]
stats.heapIndex = -1
*h = old[:n-1]
return stats
}
|
