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internal/trace: compute span stats as computing goroutine stats

Browse Source 
Move part of UserSpan event processing from cmd/trace.analyzeAnnotations
to internal/trace.GoroutineStats that returns analyzed per-goroutine
execution information. Now the execution information includes list of
spans and their execution information.

cmd/trace.analyzeAnnotations utilizes the span execution information
from internal/trace.GoroutineStats and connects them with task
information.

Change-Id: Ib7f79a3ba652a4ae55cd81ea17565bcc7e241c5c
Reviewed-on: https://go-review.googlesource.com/101917
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Peter Weinberger <pjw@google.com>
This commit is contained in:
Hana Kim 2018-03-14 22:22:31 -04:00 committed by Hyang-Ah Hana Kim
parent 24cd112086
commit 68a1c9c400
4 changed files with 227 additions and 153 deletions
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161
src/cmd/trace/annotations.go
View File

@ -95,10 +95,18 @@ func httpUserTask(w http.ResponseWriter, r *http.Request) {
if !filter.match(task) {
continue
}
// merge events in the task.events and task.spans.Start
rawEvents := append([]*trace.Event{}, task.events...)
for _, s := range task.spans {
if s.Start != nil {
rawEvents = append(rawEvents, s.Start)
}
}
sort.SliceStable(rawEvents, func(i, j int) bool { return rawEvents[i].Ts < rawEvents[j].Ts })
var events []event
var last time.Duration
for i, ev := range task.events {
for i, ev := range rawEvents {
when := time.Duration(ev.Ts)*time.Nanosecond - base
elapsed := time.Duration(ev.Ts)*time.Nanosecond - last
if i == 0 {
@ -152,65 +160,6 @@ type annotationAnalysisResult struct {
gcEvents []*trace.Event // GCStartevents, sorted
}
type activeSpanTracker struct {
stacks map[uint64][]*trace.Event // goid to stack of active span start events
}
func (t *activeSpanTracker) top(goid uint64) *trace.Event {
if t.stacks == nil {
return nil
}
stk := t.stacks[goid]
if len(stk) == 0 {
return nil
}
return stk[len(stk)-1]
}
func (t *activeSpanTracker) addSpanEvent(ev *trace.Event, task *taskDesc) *spanDesc {
if ev.Type != trace.EvUserSpan {
return nil
}
if t.stacks == nil {
t.stacks = make(map[uint64][]*trace.Event)
}
goid := ev.G
stk := t.stacks[goid]
var sd *spanDesc
switch mode := ev.Args[1]; mode {
case 0: // span start
t.stacks[goid] = append(stk, ev) // push
sd = &spanDesc{
name: ev.SArgs[0],
task: task,
goid: goid,
start: ev,
end: ev.Link,
}
case 1: // span end
if n := len(stk); n > 0 {
stk = stk[:n-1] // pop
} else {
// There is no matching span start event; can happen if the span start was before tracing.
sd = &spanDesc{
name: ev.SArgs[0],
task: task,
goid: goid,
start: nil,
end: ev,
}
}
if len(stk) == 0 {
delete(t.stacks, goid)
} else {
t.stacks[goid] = stk
}
}
return sd
}
// analyzeAnnotations analyzes user annotation events and
// returns the task descriptors keyed by internal task id.
func analyzeAnnotations() (annotationAnalysisResult, error) {
@ -226,11 +175,8 @@ func analyzeAnnotations() (annotationAnalysisResult, error) {
tasks := allTasks{}
var gcEvents []*trace.Event
var activeSpans activeSpanTracker
for _, ev := range events {
goid := ev.G
switch typ := ev.Type; typ {
case trace.EvUserTaskCreate, trace.EvUserTaskEnd, trace.EvUserLog:
taskid := ev.Args[0]
@ -248,36 +194,26 @@ func analyzeAnnotations() (annotationAnalysisResult, error) {
}
}
case trace.EvUserSpan:
taskid := ev.Args[0]
task := tasks.task(taskid)
task.addEvent(ev)
sd := activeSpans.addSpanEvent(ev, task)
if task != nil && sd != nil {
task.spans = append(task.spans, sd)
}
case trace.EvGoCreate:
// When a goroutine is newly created, it inherits the task
// of the active span if any.
//
// TODO(hyangah): the task info needs to propagate
// to all decendents, not only to the immediate child.
s := activeSpans.top(goid)
if s == nil {
continue
}
taskid := s.Args[0]
task := tasks.task(taskid)
task.addEvent(ev)
case trace.EvGCStart:
gcEvents = append(gcEvents, ev)
}
}
// combine span info.
analyzeGoroutines(events)
for goid, stats := range gs {
for _, s := range stats.Spans {
if s.TaskID == 0 {
continue
}
task := tasks.task(s.TaskID)
task.goroutines[goid] = struct{}{}
task.spans = append(task.spans, spanDesc{UserSpanDesc: s, goid: goid})
}
}
// sort spans based on the timestamps.
for _, task := range tasks {
sort.Slice(task.spans, func(i, j int) bool {
sort.SliceStable(task.spans, func(i, j int) bool {
si, sj := task.spans[i].firstTimestamp(), task.spans[j].firstTimestamp()
if si != sj {
return si < sj
@ -290,11 +226,11 @@ func analyzeAnnotations() (annotationAnalysisResult, error) {
// taskDesc represents a task.
type taskDesc struct {
name string // user-provided task name
id uint64 // internal task id
events []*trace.Event // sorted based on timestamp.
spans []*spanDesc // associated spans, sorted based on the start timestamp and then the last timestamp.
goroutines map[uint64][]*trace.Event // Events grouped by goroutine id
name string // user-provided task name
id uint64 // internal task id
events []*trace.Event // sorted based on timestamp.
spans []spanDesc // associated spans, sorted based on the start timestamp and then the last timestamp.
goroutines map[uint64]struct{} // involved goroutines
create *trace.Event // Task create event
end *trace.Event // Task end event
@ -306,7 +242,7 @@ type taskDesc struct {
func newTaskDesc(id uint64) *taskDesc {
return &taskDesc{
id: id,
goroutines: make(map[uint64][]*trace.Event),
goroutines: make(map[uint64]struct{}),
}
}
@ -320,7 +256,7 @@ func (task *taskDesc) String() string {
fmt.Fprintf(wb, "\t%d goroutines\n", len(task.goroutines))
fmt.Fprintf(wb, "\t%d spans:\n", len(task.spans))
for _, s := range task.spans {
fmt.Fprintf(wb, "\t\t%s(goid=%d)\n", s.name, s.goid)
fmt.Fprintf(wb, "\t\t%s(goid=%d)\n", s.Name, s.goid)
}
if task.parent != nil {
fmt.Fprintf(wb, "\tparent: %s\n", task.parent.name)
@ -335,11 +271,8 @@ func (task *taskDesc) String() string {
// spanDesc represents a span.
type spanDesc struct {
name string // user-provided span name
task *taskDesc // can be nil
goid uint64 // id of goroutine where the span was defined
start *trace.Event // span start event
end *trace.Event // span end event (user span end, goroutine end)
*trace.UserSpanDesc
goid uint64 // id of goroutine where the span was defined
}
type allTasks map[uint64]*taskDesc
@ -356,7 +289,7 @@ func (tasks allTasks) task(taskID uint64) *taskDesc {
t = &taskDesc{
id: taskID,
goroutines: make(map[uint64][]*trace.Event),
goroutines: make(map[uint64]struct{}),
}
tasks[taskID] = t
return t
@ -368,11 +301,8 @@ func (task *taskDesc) addEvent(ev *trace.Event) {
return
}
if ev != task.lastEvent() {
goid := ev.G
task.events = append(task.events, ev)
task.goroutines[goid] = append(task.goroutines[goid], ev)
}
task.events = append(task.events, ev)
task.goroutines[ev.G] = struct{}{}
switch typ := ev.Type; typ {
case trace.EvUserTaskCreate:
@ -558,22 +488,22 @@ func (task *taskDesc) lastEvent() *trace.Event {
// firstTimestamp returns the timestamp of span start event.
// If the span's start event is not present in the trace,
// the first timestamp of the task will be returned.
// the first timestamp of the trace will be returned.
func (span *spanDesc) firstTimestamp() int64 {
if span.start != nil {
return span.start.Ts
if span.Start != nil {
return span.Start.Ts
}
return span.task.firstTimestamp()
return firstTimestamp()
}
// lastTimestamp returns the timestamp of span end event.
// If the span's end event is not present in the trace,
// the last timestamp of the task will be returned.
// the last timestamp of the trace will be returned.
func (span *spanDesc) lastTimestamp() int64 {
if span.end != nil {
return span.end.Ts
if span.End != nil {
return span.End.Ts
}
return span.task.lastTimestamp()
return lastTimestamp()
}
// RelatedGoroutines returns IDs of goroutines related to the task. A goroutine
@ -962,7 +892,8 @@ func formatUserLog(ev *trace.Event) string {
func describeEvent(ev *trace.Event) string {
switch ev.Type {
case trace.EvGoCreate:
return fmt.Sprintf("new goroutine %d", ev.Args[0])
goid := ev.Args[0]
return fmt.Sprintf("new goroutine %d: %s", goid, gs[goid].Name)
case trace.EvGoEnd, trace.EvGoStop:
return "goroutine stopped"
case trace.EvUserLog:

9
src/cmd/trace/annotations_test.go
View File

@ -111,7 +111,7 @@ func TestAnalyzeAnnotations(t *testing.T) {
"task0": {
complete: true,
goroutines: 2,
spans: []string{"task0.span0", "task0.span1", "task0.span2"},
spans: []string{"task0.span0", "", "task0.span1", "task0.span2"},
},
"task1": {
complete: true,
@ -327,7 +327,7 @@ func traceProgram(t *testing.T, f func(), name string) error {
func spanNames(task *taskDesc) (ret []string) {
for _, s := range task.spans {
ret = append(ret, s.name)
ret = append(ret, s.Name)
}
return ret
}
@ -349,8 +349,13 @@ func childrenNames(task *taskDesc) (ret []string) {
func swapLoaderData(res traceparser.ParseResult, err error) {
// swap loader's data.
parseTrace() // fool loader.once.
loader.res = res
loader.err = err
analyzeGoroutines(nil) // fool gsInit once.
gs = traceparser.GoroutineStats(res.Events)
}
func saveTrace(buf *bytes.Buffer, name string) {

22
src/cmd/trace/trace.go
View File

@ -202,7 +202,7 @@ func httpJsonTrace(w http.ResponseWriter, r *http.Request) {
}
annotRes, _ := analyzeAnnotations()
task, ok := annotRes.tasks[taskid]
if !ok {
if !ok || len(task.events) == 0 {
log.Printf("failed to find task with id %d", taskid)
return
}
@ -824,16 +824,16 @@ func (ctx *traceContext) emitSlice(ev *trace.Event, name string) *ViewerEvent {
return sl
}
func (ctx *traceContext) emitSpan(s *spanDesc) {
id := uint64(0)
if task := s.task; task != nil {
id = task.id
func (ctx *traceContext) emitSpan(s spanDesc) {
if s.Name == "" {
return
}
id := s.TaskID
scopeID := fmt.Sprintf("%x", id)
sl0 := &ViewerEvent{
Category: "Span",
Name: s.name,
Name: s.Name,
Phase: "b",
Time: float64(s.firstTimestamp()) / 1e3,
Tid: s.goid,
@ -841,14 +841,14 @@ func (ctx *traceContext) emitSpan(s *spanDesc) {
Scope: scopeID,
Cname: colorDeepMagenta,
}
if s.start != nil {
sl0.Stack = ctx.stack(s.start.Stk)
if s.Start != nil {
sl0.Stack = ctx.stack(s.Start.Stk)
}
ctx.emit(sl0)
sl1 := &ViewerEvent{
Category: "Span",
Name: s.name,
Name: s.Name,
Phase: "e",
Time: float64(s.lastTimestamp()) / 1e3,
Tid: s.goid,
@ -856,8 +856,8 @@ func (ctx *traceContext) emitSpan(s *spanDesc) {
Scope: scopeID,
Cname: colorDeepMagenta,
}
if s.end != nil {
sl1.Stack = ctx.stack(s.end.Stk)
if s.End != nil {
sl1.Stack = ctx.stack(s.End.Stk)
}
ctx.emit(sl1)
}

188
src/internal/trace/goroutines.go
View File

@ -4,7 +4,9 @@
package trace
// GDesc contains statistics about execution of a single goroutine.
import "sort"
// GDesc contains statistics and execution details of a single goroutine.
type GDesc struct {
ID uint64
Name string
@ -13,6 +15,37 @@ type GDesc struct {
StartTime int64
EndTime int64
// List of spans in the goroutine, sorted based on the start time.
Spans []*UserSpanDesc
// Statistics of execution time during the goroutine execution.
GExecutionStat
*gdesc // private part.
}
// UserSpanDesc represents a span and goroutine execution stats
// while the span was active.
type UserSpanDesc struct {
TaskID uint64
Name string
// Span start event. Normally EvUserSpan start event or nil,
// but can be EvGoCreate event if the span is a synthetic
// span representing task inheritance from the parent goroutine.
Start *Event
// Span end event. Normally EvUserSpan end event or nil,
// but can be EvGoStop or EvGoEnd event if the goroutine
// terminated without explicitely ending the span.
End *Event
GExecutionStat
}
// GExecutionStat contains statistics about a goroutine's execution
// during a period of time.
type GExecutionStat struct {
ExecTime int64
SchedWaitTime int64
IOTime int64
@ -21,8 +54,71 @@ type GDesc struct {
GCTime int64
SweepTime int64
TotalTime int64
}
*gdesc // private part
// sub returns the stats v-s.
func (s GExecutionStat) sub(v GExecutionStat) (r GExecutionStat) {
r = s
r.ExecTime -= v.ExecTime
r.SchedWaitTime -= v.SchedWaitTime
r.IOTime -= v.IOTime
r.BlockTime -= v.BlockTime
r.SyscallTime -= v.SyscallTime
r.GCTime -= v.GCTime
r.SweepTime -= v.SweepTime
r.TotalTime -= v.TotalTime
return r
}
// snapshotStat returns the snapshot of the goroutine execution statistics.
// This is called as we process the ordered trace event stream. lastTs and
// activeGCStartTime are used to process pending statistics if this is called
// before any goroutine end event.
func (g *GDesc) snapshotStat(lastTs, activeGCStartTime int64) (ret GExecutionStat) {
ret = g.GExecutionStat
if g.gdesc == nil {
return ret // finalized GDesc. No pending state.
}
if activeGCStartTime != 0 {
ret.GCTime += lastTs - activeGCStartTime
}
if g.TotalTime == 0 {
ret.TotalTime = lastTs - g.CreationTime
}
if g.lastStartTime != 0 {
ret.ExecTime += lastTs - g.lastStartTime
}
if g.blockNetTime != 0 {
ret.IOTime += lastTs - g.blockNetTime
}
if g.blockSyncTime != 0 {
ret.BlockTime += lastTs - g.blockSyncTime
}
if g.blockSyscallTime != 0 {
ret.SyscallTime += lastTs - g.blockSyscallTime
}
if g.blockSchedTime != 0 {
ret.SchedWaitTime += lastTs - g.blockSchedTime
}
if g.blockSweepTime != 0 {
ret.SweepTime += lastTs - g.blockSweepTime
}
return ret
}
// finalizeActiveSpans is called when processing a goroutine end event
// to finalize any active spans in the goroutine.
func (g *GDesc) finalizeActiveSpans(lastTs, activeGCStartTime int64, trigger *Event) {
for _, s := range g.activeSpans {
s.End = trigger
s.GExecutionStat = g.snapshotStat(lastTs, activeGCStartTime).sub(s.GExecutionStat)
g.Spans = append(g.Spans, s)
}
g.activeSpans = nil
}
// gdesc is a private part of GDesc that is required only during analysis.
@ -34,6 +130,8 @@ type gdesc struct {
blockSweepTime int64
blockGCTime int64
blockSchedTime int64
activeSpans []*UserSpanDesc // stack of active spans
}
// GoroutineStats generates statistics for all goroutines in the trace.
@ -47,6 +145,19 @@ func GoroutineStats(events []*Event) map[uint64]*GDesc {
case EvGoCreate:
g := &GDesc{ID: ev.Args[0], CreationTime: ev.Ts, gdesc: new(gdesc)}
g.blockSchedTime = ev.Ts
// When a goroutine is newly created, inherit the
// task of the active span. For ease handling of
// this case, we create a fake span description with
// the task id.
if creatorG := gs[ev.G]; creatorG != nil && len(creatorG.gdesc.activeSpans) > 0 {
spans := creatorG.gdesc.activeSpans
s := spans[len(spans)-1]
if s.TaskID != 0 {
g.gdesc.activeSpans = []*UserSpanDesc{
{TaskID: s.TaskID, Start: ev},
}
}
}
gs[g.ID] = g
case EvGoStart, EvGoStartLabel:
g := gs[ev.G]
@ -65,9 +176,10 @@ func GoroutineStats(events []*Event) map[uint64]*GDesc {
case EvGoEnd, EvGoStop:
g := gs[ev.G]
g.ExecTime += ev.Ts - g.lastStartTime
g.lastStartTime = 0
g.TotalTime = ev.Ts - g.CreationTime
g.EndTime = ev.Ts
if gcStartTime != 0 {
if gcStartTime != 0 { // terminating while GC is active
if g.CreationTime < gcStartTime {
g.GCTime += ev.Ts - gcStartTime
} else {
@ -76,25 +188,31 @@ func GoroutineStats(events []*Event) map[uint64]*GDesc {
g.GCTime += ev.Ts - g.CreationTime
}
}
g.finalizeActiveSpans(lastTs, gcStartTime, ev)
case EvGoBlockSend, EvGoBlockRecv, EvGoBlockSelect,
EvGoBlockSync, EvGoBlockCond:
g := gs[ev.G]
g.ExecTime += ev.Ts - g.lastStartTime
g.lastStartTime = 0
g.blockSyncTime = ev.Ts
case EvGoSched, EvGoPreempt:
g := gs[ev.G]
g.ExecTime += ev.Ts - g.lastStartTime
g.lastStartTime = 0
g.blockSchedTime = ev.Ts
case EvGoSleep, EvGoBlock:
g := gs[ev.G]
g.ExecTime += ev.Ts - g.lastStartTime
g.lastStartTime = 0
case EvGoBlockNet:
g := gs[ev.G]
g.ExecTime += ev.Ts - g.lastStartTime
g.lastStartTime = 0
g.blockNetTime = ev.Ts
case EvGoBlockGC:
g := gs[ev.G]
g.ExecTime += ev.Ts - g.lastStartTime
g.lastStartTime = 0
g.blockGCTime = ev.Ts
case EvGoUnblock:
g := gs[ev.Args[0]]
@ -110,6 +228,7 @@ func GoroutineStats(events []*Event) map[uint64]*GDesc {
case EvGoSysBlock:
g := gs[ev.G]
g.ExecTime += ev.Ts - g.lastStartTime
g.lastStartTime = 0
g.blockSyscallTime = ev.Ts
case EvGoSysExit:
g := gs[ev.G]
@ -144,32 +263,51 @@ func GoroutineStats(events []*Event) map[uint64]*GDesc {
}
}
gcStartTime = 0 // indicates gc is inactive.
case EvUserSpan:
g := gs[ev.G]
switch mode := ev.Args[1]; mode {
case 0: // span start
g.activeSpans = append(g.activeSpans, &UserSpanDesc{
Name: ev.SArgs[0],
TaskID: ev.Args[0],
Start: ev,
GExecutionStat: g.snapshotStat(lastTs, gcStartTime),
})
case 1: // span end
var sd *UserSpanDesc
if spanStk := g.activeSpans; len(spanStk) > 0 {
n := len(spanStk)
sd = spanStk[n-1]
spanStk = spanStk[:n-1] // pop
g.activeSpans = spanStk
} else {
sd = &UserSpanDesc{
Name: ev.SArgs[0],
TaskID: ev.Args[0],
}
}
sd.GExecutionStat = g.snapshotStat(lastTs, gcStartTime).sub(sd.GExecutionStat)
sd.End = ev
g.Spans = append(g.Spans, sd)
}
}
}
for _, g := range gs {
if g.TotalTime == 0 {
g.TotalTime = lastTs - g.CreationTime
}
if g.EndTime == 0 {
g.EndTime = lastTs
}
if g.blockNetTime != 0 {
g.IOTime += lastTs - g.blockNetTime
g.blockNetTime = 0
}
if g.blockSyncTime != 0 {
g.BlockTime += lastTs - g.blockSyncTime
g.blockSyncTime = 0
}
if g.blockSyscallTime != 0 {
g.SyscallTime += lastTs - g.blockSyscallTime
g.blockSyscallTime = 0
}
if g.blockSchedTime != 0 {
g.SchedWaitTime += lastTs - g.blockSchedTime
g.blockSchedTime = 0
}
g.GExecutionStat = g.snapshotStat(lastTs, gcStartTime)
g.finalizeActiveSpans(lastTs, gcStartTime, nil)
// sort based on span start time
sort.Slice(g.Spans, func(i, j int) bool {
x := g.Spans[i].Start
y := g.Spans[j].Start
if x == nil {
return true
}
if y == nil {
return false
}
return x.Ts < y.Ts
})
g.gdesc = nil
}