package trace

import "internal/trace"

Index

Constants 

const (
	// Special P identifiers:
	FakeP    = 1000000 + iota
	TimerP   // depicts timer unblocks
	NetpollP // depicts network unblocks
	SyscallP // depicts returns from syscalls
	GCP      // depicts GC state
)
const (
	EvNone              = 0  // unused
	EvBatch             = 1  // start of per-P batch of events [pid, timestamp]
	EvFrequency         = 2  // contains tracer timer frequency [frequency (ticks per second)]
	EvStack             = 3  // stack [stack id, number of PCs, array of {PC, func string ID, file string ID, line}]
	EvGomaxprocs        = 4  // current value of GOMAXPROCS [timestamp, GOMAXPROCS, stack id]
	EvProcStart         = 5  // start of P [timestamp, thread id]
	EvProcStop          = 6  // stop of P [timestamp]
	EvGCStart           = 7  // GC start [timestamp, seq, stack id]
	EvGCDone            = 8  // GC done [timestamp]
	EvGCSTWStart        = 9  // GC mark termination start [timestamp, kind]
	EvGCSTWDone         = 10 // GC mark termination done [timestamp]
	EvGCSweepStart      = 11 // GC sweep start [timestamp, stack id]
	EvGCSweepDone       = 12 // GC sweep done [timestamp, swept, reclaimed]
	EvGoCreate          = 13 // goroutine creation [timestamp, new goroutine id, new stack id, stack id]
	EvGoStart           = 14 // goroutine starts running [timestamp, goroutine id, seq]
	EvGoEnd             = 15 // goroutine ends [timestamp]
	EvGoStop            = 16 // goroutine stops (like in select{}) [timestamp, stack]
	EvGoSched           = 17 // goroutine calls Gosched [timestamp, stack]
	EvGoPreempt         = 18 // goroutine is preempted [timestamp, stack]
	EvGoSleep           = 19 // goroutine calls Sleep [timestamp, stack]
	EvGoBlock           = 20 // goroutine blocks [timestamp, stack]
	EvGoUnblock         = 21 // goroutine is unblocked [timestamp, goroutine id, seq, stack]
	EvGoBlockSend       = 22 // goroutine blocks on chan send [timestamp, stack]
	EvGoBlockRecv       = 23 // goroutine blocks on chan recv [timestamp, stack]
	EvGoBlockSelect     = 24 // goroutine blocks on select [timestamp, stack]
	EvGoBlockSync       = 25 // goroutine blocks on Mutex/RWMutex [timestamp, stack]
	EvGoBlockCond       = 26 // goroutine blocks on Cond [timestamp, stack]
	EvGoBlockNet        = 27 // goroutine blocks on network [timestamp, stack]
	EvGoSysCall         = 28 // syscall enter [timestamp, stack]
	EvGoSysExit         = 29 // syscall exit [timestamp, goroutine id, seq, real timestamp]
	EvGoSysBlock        = 30 // syscall blocks [timestamp]
	EvGoWaiting         = 31 // denotes that goroutine is blocked when tracing starts [timestamp, goroutine id]
	EvGoInSyscall       = 32 // denotes that goroutine is in syscall when tracing starts [timestamp, goroutine id]
	EvHeapAlloc         = 33 // memstats.heap_live change [timestamp, heap_alloc]
	EvNextGC            = 34 // memstats.next_gc change [timestamp, next_gc]
	EvTimerGoroutine    = 35 // denotes timer goroutine [timer goroutine id]
	EvFutileWakeup      = 36 // denotes that the previous wakeup of this goroutine was futile [timestamp]
	EvString            = 37 // string dictionary entry [ID, length, string]
	EvGoStartLocal      = 38 // goroutine starts running on the same P as the last event [timestamp, goroutine id]
	EvGoUnblockLocal    = 39 // goroutine is unblocked on the same P as the last event [timestamp, goroutine id, stack]
	EvGoSysExitLocal    = 40 // syscall exit on the same P as the last event [timestamp, goroutine id, real timestamp]
	EvGoStartLabel      = 41 // goroutine starts running with label [timestamp, goroutine id, seq, label string id]
	EvGoBlockGC         = 42 // goroutine blocks on GC assist [timestamp, stack]
	EvGCMarkAssistStart = 43 // GC mark assist start [timestamp, stack]
	EvGCMarkAssistDone  = 44 // GC mark assist done [timestamp]
	EvCount             = 45
)

Event types in the trace. Verbatim copy from src/runtime/trace.go with the "trace" prefix removed.

Variables 

var BreakTimestampsForTesting bool

BreakTimestampsForTesting causes the parser to randomly alter timestamps (for testing of broken cputicks). 

var ErrTimeOrder = fmt.Errorf("time stamps out of order")

ErrTimeOrder is returned by Parse when the trace contains time stamps that do not respect actual event ordering. 

var EventDescriptions = [EvCount]struct {
	Name       string
	minVersion int
	Stack      bool
	Args       []string
}{
	EvNone:              {"None", 1005, false, []string{}},
	EvBatch:             {"Batch", 1005, false, []string{"p", "ticks"}},
	EvFrequency:         {"Frequency", 1005, false, []string{"freq"}},
	EvStack:             {"Stack", 1005, false, []string{"id", "siz"}},
	EvGomaxprocs:        {"Gomaxprocs", 1005, true, []string{"procs"}},
	EvProcStart:         {"ProcStart", 1005, false, []string{"thread"}},
	EvProcStop:          {"ProcStop", 1005, false, []string{}},
	EvGCStart:           {"GCStart", 1005, true, []string{"seq"}},
	EvGCDone:            {"GCDone", 1005, false, []string{}},
	EvGCSTWStart:        {"GCSTWStart", 1005, false, []string{"kind"}},
	EvGCSTWDone:         {"GCSTWDone", 1005, false, []string{}},
	EvGCSweepStart:      {"GCSweepStart", 1005, true, []string{}},
	EvGCSweepDone:       {"GCSweepDone", 1005, false, []string{"swept", "reclaimed"}},
	EvGoCreate:          {"GoCreate", 1005, true, []string{"g", "stack"}},
	EvGoStart:           {"GoStart", 1005, false, []string{"g", "seq"}},
	EvGoEnd:             {"GoEnd", 1005, false, []string{}},
	EvGoStop:            {"GoStop", 1005, true, []string{}},
	EvGoSched:           {"GoSched", 1005, true, []string{}},
	EvGoPreempt:         {"GoPreempt", 1005, true, []string{}},
	EvGoSleep:           {"GoSleep", 1005, true, []string{}},
	EvGoBlock:           {"GoBlock", 1005, true, []string{}},
	EvGoUnblock:         {"GoUnblock", 1005, true, []string{"g", "seq"}},
	EvGoBlockSend:       {"GoBlockSend", 1005, true, []string{}},
	EvGoBlockRecv:       {"GoBlockRecv", 1005, true, []string{}},
	EvGoBlockSelect:     {"GoBlockSelect", 1005, true, []string{}},
	EvGoBlockSync:       {"GoBlockSync", 1005, true, []string{}},
	EvGoBlockCond:       {"GoBlockCond", 1005, true, []string{}},
	EvGoBlockNet:        {"GoBlockNet", 1005, true, []string{}},
	EvGoSysCall:         {"GoSysCall", 1005, true, []string{}},
	EvGoSysExit:         {"GoSysExit", 1005, false, []string{"g", "seq", "ts"}},
	EvGoSysBlock:        {"GoSysBlock", 1005, false, []string{}},
	EvGoWaiting:         {"GoWaiting", 1005, false, []string{"g"}},
	EvGoInSyscall:       {"GoInSyscall", 1005, false, []string{"g"}},
	EvHeapAlloc:         {"HeapAlloc", 1005, false, []string{"mem"}},
	EvNextGC:            {"NextGC", 1005, false, []string{"mem"}},
	EvTimerGoroutine:    {"TimerGoroutine", 1005, false, []string{"g"}},
	EvFutileWakeup:      {"FutileWakeup", 1005, false, []string{}},
	EvString:            {"String", 1007, false, []string{}},
	EvGoStartLocal:      {"GoStartLocal", 1007, false, []string{"g"}},
	EvGoUnblockLocal:    {"GoUnblockLocal", 1007, true, []string{"g"}},
	EvGoSysExitLocal:    {"GoSysExitLocal", 1007, false, []string{"g", "ts"}},
	EvGoStartLabel:      {"GoStartLabel", 1008, false, []string{"g", "seq", "label"}},
	EvGoBlockGC:         {"GoBlockGC", 1008, true, []string{}},
	EvGCMarkAssistStart: {"GCMarkAssistStart", 1009, true, []string{}},
	EvGCMarkAssistDone:  {"GCMarkAssistDone", 1009, false, []string{}},
}

Functions

func GoroutineStats 

func GoroutineStats(events []*Event) map[uint64]*GDesc

GoroutineStats generates statistics for all goroutines in the trace.

func Print 

func Print(events []*Event)

Print dumps events to stdout. For debugging.

func PrintEvent 

func PrintEvent(ev *Event)

PrintEvent dumps the event to stdout. For debugging.

func RelatedGoroutines 

func RelatedGoroutines(events []*Event, goid uint64) map[uint64]bool

RelatedGoroutines finds a set of goroutines related to goroutine goid.

Types

type Event 

type Event struct {
	Off  int  // offset in input file (for debugging and error reporting)
	Type byte // one of Ev*

	Ts    int64     // timestamp in nanoseconds
	P     int       // P on which the event happened (can be one of TimerP, NetpollP, SyscallP)
	G     uint64    // G on which the event happened
	StkID uint64    // unique stack ID
	Stk   []*Frame  // stack trace (can be empty)
	Args  [3]uint64 // event-type-specific arguments
	SArgs []string  // event-type-specific string args
	// linked event (can be nil), depends on event type:
	// for GCStart: the GCStop
	// for GCSTWStart: the GCSTWDone
	// for GCSweepStart: the GCSweepDone
	// for GoCreate: first GoStart of the created goroutine
	// for GoStart/GoStartLabel: the associated GoEnd, GoBlock or other blocking event
	// for GoSched/GoPreempt: the next GoStart
	// for GoBlock and other blocking events: the unblock event
	// for GoUnblock: the associated GoStart
	// for blocking GoSysCall: the associated GoSysExit
	// for GoSysExit: the next GoStart
	// for GCMarkAssistStart: the associated GCMarkAssistDone
	Link *Event
	// contains filtered or unexported fields
}

Event describes one event in the trace.

type Frame 

type Frame struct {
	PC   uint64
	Fn   string
	File string
	Line int
}

Frame is a frame in stack traces.

type GDesc 

type GDesc struct {
	ID           uint64
	Name         string
	PC           uint64
	CreationTime int64
	StartTime    int64
	EndTime      int64

	ExecTime      int64
	SchedWaitTime int64
	IOTime        int64
	BlockTime     int64
	SyscallTime   int64
	GCTime        int64
	SweepTime     int64
	TotalTime     int64
	// contains filtered or unexported fields
}

GDesc contains statistics about execution of a single goroutine.

type ParseResult 

type ParseResult struct {
	// Events is the sorted list of Events in the trace.
	Events []*Event
	// Stacks is the stack traces keyed by stack IDs from the trace.
	Stacks map[uint64][]*Frame
}

ParseResult is the result of Parse.

func Parse 

func Parse(r io.Reader, bin string) (ParseResult, error)

Parse parses, post-processes and verifies the trace.

type Writer 

type Writer struct {
	bytes.Buffer
}

Writer is a test trace writer.

func NewWriter 

func NewWriter() *Writer

func (*Writer) Emit 

func (w *Writer) Emit(typ byte, args ...uint64)

Emit writes an event record to the trace. See Event types for valid types and required arguments.

Source Files

goroutines.go order.go parser.go writer.go

Version
v1.10.1
Published
Mar 29, 2018
Platform
windows/amd64
Imports
13 packages
Last checked
2 minutes ago –

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