pprof

package
v1.6.1 Latest Latest
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 Go to latest Published: Jun 21, 2024 License: AGPL-3.0 Imports: 26 Imported by: 0

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Constants

View Source 
const (
	ProfileIDLabelName = "profile_id" // For compatibility with the existing clients.
	SpanIDLabelName    = "span_id"    // Will be supported in the future.
)

Variables

This section is empty.

Functions

func CompareSampleLabels added in v1.1.0 

func CompareSampleLabels(a, b []*profilev1.Label) int

CompareSampleLabels compares sample label pairs. It's expected that sample labels are sorted. The result will be 0 if a == b, < 0 if a < b, and > 0 if a > b.

func DropGoTypeParameters added in v1.6.0 

func DropGoTypeParameters(p *profilev1.Profile) *profilev1.Profile

DropGoTypeParameters removes of type parameters from Go function names.

In go 1.21 and above, function names include type parameters, however, due to a bug, a function name could include any of the type instances regardless of the call site. Thus, e.g., x[T1].foo and x[T2].foo can't be distinguished in a profile. This leads to incorrect profiles and incorrect flame graphs, and hugely increases cardinality of stack traces.

The function renames x[T1].foo and x[T2].foo to x[...].foo and normalizes the profile, if type parameters are present in the profile. Otherwise, the profile returns unchanged.

See https://github.com/golang/go/issues/64528.

func FilterLabelsInPlace added in v1.1.0 

func FilterLabelsInPlace(labels []*profilev1.Label, keys []int64) int

func FixGoProfile added in v1.6.0 

func FixGoProfile(p *profilev1.Profile) *profilev1.Profile

FixGoProfile fixes known issues with profiles collected with the standard Go profiler.

Note that the function presumes that p is a Go profile and does not verify this. It is expected that the function is called very early in the profile processing chain and normalized after, regardless of the function outcome.

func FromBytes 

func FromBytes(input []byte, fn func(*profilev1.Profile, int) error) error

func FromProfile 

func FromProfile(p *profile.Profile) (*profilev1.Profile, error)

func GetLanguage added in v1.2.0 

func GetLanguage(profile *Profile, logger log.Logger) string

func LabelID added in v1.2.0 

func LabelID(p *profilev1.Profile, name string) int64

func LabelKeysByString added in v1.1.0 

func LabelKeysByString(p *profilev1.Profile, keys ...string) []int64

func LabelKeysMapByString added in v1.1.0 

func LabelKeysMapByString(p *profilev1.Profile, keys ...string) map[string]int64

func LabelsWithout added in v1.1.0 

func LabelsWithout(labels []*profilev1.Label, keys []int64) []*profilev1.Label

func Marshal added in v1.2.1 

func Marshal(p *profilev1.Profile, compress bool) ([]byte, error)

func MayHaveGoHeapTruncatedStacktraces added in v1.6.0 

func MayHaveGoHeapTruncatedStacktraces(p *profilev1.Profile) bool

MayHaveGoHeapTruncatedStacktraces reports whether there are any chances that the profile may have truncated stack traces.

func ProfileSpans added in v1.2.0 

func ProfileSpans(p *profilev1.Profile) []uint64

func RenameLabel added in v1.1.0 

func RenameLabel(p *profilev1.Profile, oldName, newName string)

func RepairGoHeapTruncatedStacktraces added in v1.6.0 

func RepairGoHeapTruncatedStacktraces(p *profilev1.Profile)

RepairGoHeapTruncatedStacktraces repairs truncated stack traces in Go heap profiles.

Go heap profile has a depth limit of 32 frames, which often renders profiles unreadable, and also increases cardinality of stack traces.

The function guesses truncated frames based on neighbors and repairs stack traces if there are high chances that this part is present in the profile. The heuristic is as follows:

For each stack trace S taller than 24 frames: if there is another stack trace R taller than 24 frames that overlaps with the given one by at least 16 frames in a row from the top, and has frames above its root, stack S considered truncated, and the missing part is copied from R.

func RewriteFunctions added in v1.2.0 

func RewriteFunctions(p *profilev1.Profile, n []uint32)

func RewriteLocations added in v1.2.0 

func RewriteLocations(p *profilev1.Profile, n []uint32)

func RewriteMappings added in v1.2.0 

func RewriteMappings(p *profilev1.Profile, n []uint32)

func RewriteStrings added in v1.2.0 

func RewriteStrings(p *profilev1.Profile, n []uint32)

func SetProfileMetadata added in v1.2.1 

func SetProfileMetadata(p *profilev1.Profile, ty *typesv1.ProfileType, timeNanos int64, period int64)

SetProfileMetadata sets the metadata on the profile.

func Unmarshal added in v1.2.1 

func Unmarshal(data []byte, p *profilev1.Profile) error

func ZeroLabelStrings added in v1.2.0 

func ZeroLabelStrings(p *profilev1.Profile)

Types

type FunctionKey added in v1.2.0 

type FunctionKey struct {
	// contains filtered or unexported fields
}

func GetFunctionKey added in v1.2.0 

func GetFunctionKey(fn *profilev1.Function) FunctionKey

type LabelsByKeyValue added in v1.1.0 

type LabelsByKeyValue []*profilev1.Label

func (LabelsByKeyValue) Len added in v1.1.0 

func (l LabelsByKeyValue) Len() int

func (LabelsByKeyValue) Less added in v1.1.0 

func (l LabelsByKeyValue) Less(i, j int) bool

func (LabelsByKeyValue) Swap added in v1.1.0 

func (l LabelsByKeyValue) Swap(i, j int)

type LocationKey added in v1.2.0 

type LocationKey struct {
	// contains filtered or unexported fields
}

func GetLocationKey added in v1.2.0 

func GetLocationKey(loc *profilev1.Location) LocationKey

type MappingKey added in v1.2.0 

type MappingKey struct {
	// contains filtered or unexported fields
}

func GetMappingKey added in v1.2.0 

func GetMappingKey(m *profilev1.Mapping) MappingKey

type Profile 

type Profile struct {
	*profilev1.Profile
	// contains filtered or unexported fields
}

func NewProfile added in v1.1.0 

func NewProfile() *Profile

func OpenFile 

func OpenFile(path string) (*Profile, error)

func RawFromBytes 

func RawFromBytes(input []byte) (_ *Profile, err error)

func RawFromProto added in v1.1.0 

func RawFromProto(pbp *profilev1.Profile) *Profile

func (*Profile) Normalize 

func (p *Profile) Normalize()

Normalize normalizes the profile by:

  • Removing all duplicate samples (summing their values).
  • Removing redundant profile labels (byte => unique of an allocation site) todo: We should reassess if this was a good choice because by merging duplicate stacktrace samples we cannot recompute the allocation per site ("bytes") profile label.
  • Removing empty samples.
  • Then remove unused references.
  • Ensure that the profile has a time_nanos set
  • Removes addresses from symbolized profiles.
  • Removes elements with invalid references.
  • Converts identifiers to indices.
  • Ensures that string_table[0] is "".

func (*Profile) WriteTo 

func (p *Profile) WriteTo(w io.Writer) (int64, error)

WriteTo writes the profile to the given writer.

type ProfileMerge added in v1.2.0 

type ProfileMerge struct {
	// contains filtered or unexported fields
}

func (*ProfileMerge) Merge added in v1.2.0 

func (m *ProfileMerge) Merge(p *profilev1.Profile) error

Merge adds p to the profile merge, cloning new objects. Profile p is modified in place but not retained by the function.

func (*ProfileMerge) Profile added in v1.2.0 

func (m *ProfileMerge) Profile() *profilev1.Profile

type RewriteTable added in v1.2.0 

type RewriteTable[K comparable, V, M any] struct {
	// contains filtered or unexported fields
}

RewriteTable maintains unique values V and their indices. V is never modified nor retained, K and M are kept in memory.

func NewRewriteTable added in v1.2.0 

func NewRewriteTable[K comparable, V, M any](
	size int,
	k func(V) K,
	v func(V) M,
) RewriteTable[K, V, M]

func (*RewriteTable[K, V, M]) Append added in v1.2.0 

func (t *RewriteTable[K, V, M]) Append(values []V)

func (*RewriteTable[K, V, M]) Index added in v1.2.0 

func (t *RewriteTable[K, V, M]) Index(dst []uint32, values []V)

func (*RewriteTable[K, V, M]) Values added in v1.2.0 

func (t *RewriteTable[K, V, M]) Values() []M

type SampleExporter added in v1.1.0 

type SampleExporter struct {
	// contains filtered or unexported fields
}

func NewSampleExporter added in v1.1.0 

func NewSampleExporter(p *profilev1.Profile) *SampleExporter

func (*SampleExporter) ExportSamples added in v1.1.0 

func (e *SampleExporter) ExportSamples(dst *profilev1.Profile, samples []*profilev1.Sample) *profilev1.Profile

ExportSamples creates a new complete profile with the subset of samples provided. It is assumed that those are part of the source profile. Provided samples are modified in place.

The same exporter instance can be used to export non-overlapping sample sets from a single profile.

type SampleGroup added in v1.1.0 

type SampleGroup struct {
	Labels  []*profilev1.Label
	Samples []*profilev1.Sample
}

func GroupSamplesByLabels added in v1.1.0 

func GroupSamplesByLabels(p *profilev1.Profile) []SampleGroup

GroupSamplesByLabels splits samples into groups by labels. It's expected that sample labels are sorted.

func GroupSamplesWithoutLabels added in v1.1.0 

func GroupSamplesWithoutLabels(p *profilev1.Profile, labels ...string) []SampleGroup

GroupSamplesWithoutLabels splits samples into groups by labels ignoring ones from the list: those are preserved as sample labels. It's expected that sample labels are sorted.

func GroupSamplesWithoutLabelsByKey added in v1.1.0 

func GroupSamplesWithoutLabelsByKey(p *profilev1.Profile, keys []int64) []SampleGroup

type SampleHasher added in v1.1.0 

type SampleHasher struct {
	// contains filtered or unexported fields
}

func (SampleHasher) Hashes added in v1.1.0 

func (h SampleHasher) Hashes(samples []*profilev1.Sample) []uint64

type SampleKey added in v1.2.0 

type SampleKey struct {
	// contains filtered or unexported fields
}

func GetSampleKey added in v1.2.0 

func GetSampleKey(s *profilev1.Sample) SampleKey

type SamplesByLabels added in v1.1.0 

type SamplesByLabels []*profilev1.Sample

func (SamplesByLabels) Len added in v1.1.0 

func (s SamplesByLabels) Len() int

func (SamplesByLabels) Less added in v1.1.0 

func (s SamplesByLabels) Less(i, j int) bool

func (SamplesByLabels) Swap added in v1.1.0 

func (s SamplesByLabels) Swap(i, j int)

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