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|
package flamegraph
import (
"encoding/json"
"fmt"
"math"
"ior/internal/event"
"ior/internal/file"
coreflamegraph "ior/internal/flamegraph"
"ior/internal/types"
)
const (
fixtureSmallDepth = 5
fixtureSmallBreadth = 3
fixtureMediumDepth = 10
fixtureMediumBreadth = 5
fixtureLargeDepth = 15
fixtureLargeBreadth = 8
fixtureDeepDepth = 50
fixtureDeepBreadth = 2
fixtureWideDepth = 3
fixtureWideBreadth = 50
)
func generateTestTrie(depth, breadthPerLevel int) *coreflamegraph.LiveTrie {
lt := coreflamegraph.NewLiveTrie([]string{"comm", "path", "tracepoint"}, "count")
comms := []string{"api", "db", "worker", "cache"}
traceIDs := []types.TraceId{
types.SYS_ENTER_READ,
types.SYS_ENTER_WRITE,
types.SYS_ENTER_OPENAT,
types.SYS_ENTER_CLOSE,
}
totalEvents := maxInt(100, fixtureTargetFrames(depth, breadthPerLevel)/2)
for i := 0; i < totalEvents; i++ {
comm := comms[i%len(comms)]
traceID := traceIDs[i%len(traceIDs)]
path := buildBenchmarkPath(depth, breadthPerLevel, i)
lt.Ingest(newBenchmarkPair(comm, traceID, uint32(1000+(i%256)), uint32(200000+i), path))
}
return lt
}
func generateTestSnapshot(depth, breadthPerLevel int) *snapshotNode {
targetFrames := fixtureTargetFrames(depth, breadthPerLevel)
if targetFrames < 1 {
targetFrames = 1
}
root := &snapshotNode{Name: "root", Value: 1}
type qItem struct {
node *snapshotNode
depth int
}
queue := []qItem{{node: root, depth: 0}}
created := 1
for len(queue) > 0 && created < targetFrames {
item := queue[0]
queue = queue[1:]
if item.depth >= depth {
continue
}
remaining := targetFrames - created
branchCount := breadthPerLevel
if branchCount > remaining {
branchCount = remaining
}
for i := 0; i < branchCount; i++ {
child := &snapshotNode{
Name: fmt.Sprintf("d%d-n%d", item.depth+1, created+i),
Value: 1,
}
item.node.Children = append(item.node.Children, child)
queue = append(queue, qItem{node: child, depth: item.depth + 1})
}
created += branchCount
}
computeSnapshotTotals(root)
return root
}
func fixtureTargetFrames(depth, breadth int) int {
switch {
case depth == fixtureSmallDepth && breadth == fixtureSmallBreadth:
return 121
case depth == fixtureMediumDepth && breadth == fixtureMediumBreadth:
return 2500
case depth == fixtureLargeDepth && breadth == fixtureLargeBreadth:
return 12000
case depth == fixtureDeepDepth && breadth == fixtureDeepBreadth:
return 100
case depth == fixtureWideDepth && breadth == fixtureWideBreadth:
return 5000
default:
return maxInt(1, depth*breadth*10)
}
}
func computeSnapshotTotals(node *snapshotNode) uint64 {
if node == nil {
return 0
}
total := node.Value
for _, child := range node.Children {
total += computeSnapshotTotals(child)
}
node.Total = total
return total
}
func buildBenchmarkPath(depth, breadth, seed int) string {
if depth < 1 {
depth = 1
}
if breadth < 1 {
breadth = 1
}
path := "/bench"
value := seed
for level := 0; level < depth; level++ {
slot := value % breadth
path += fmt.Sprintf("/l%d-b%d", level, slot)
value = value / breadth
}
return path
}
func newBenchmarkPair(comm string, traceID types.TraceId, pid, tid uint32, path string) *event.Pair {
enter := &types.OpenEvent{
TraceId: traceID,
Pid: pid,
Tid: tid,
}
exit := &types.RetEvent{
TraceId: types.SYS_EXIT_OPENAT,
Pid: pid,
Tid: tid,
}
pair := event.NewPair(enter)
pair.ExitEv = exit
pair.File = file.NewFd(3, path, 0)
pair.Comm = comm
pair.Duration = 1
pair.DurationToPrev = 1
pair.Bytes = 64
return pair
}
func snapshotNodeCount(node *snapshotNode) int {
if node == nil {
return 0
}
total := 1
for _, child := range node.Children {
total += snapshotNodeCount(child)
}
return total
}
func approxEqualCount(got, want int) bool {
if got == want {
return true
}
const tolerance = 0.2
diff := math.Abs(float64(got-want)) / float64(want)
return diff <= tolerance
}
func decodeTrieSnapshot(lt *coreflamegraph.LiveTrie) (*snapshotNode, error) {
payload, _ := lt.SnapshotJSON()
var snap snapshotNode
if err := json.Unmarshal(payload, &snap); err != nil {
return nil, err
}
return &snap, nil
}
|
