profile

package standard library
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 Go to latest Published: Dec 6, 2024 License: BSD-3-Clause Imports: 10 Imported by: 0

Documentation

Overview

Package profile represents a pprof profile as a directed graph.

This package is a simplified fork of github.com/google/pprof/internal/graph.

Package profile provides a representation of github.com/google/pprof/proto/profile.proto and methods to encode/decode/merge profiles in this format.

Index

Constants

This section is empty.

Variables

View Source 
var ErrNoData = fmt.Errorf("empty input file")

Functions

This section is empty.

Types

type Demangler 

type Demangler func(name []string) (map[string]string, error)

Demangler maps symbol names to a human-readable form. This may include C++ demangling and additional simplification. Names that are not demangled may be missing from the resulting map.

type Edge added in go1.23.0 

type Edge struct {
	Src, Dest *Node
	// The summary weight of the edge
	Weight, WeightDiv int64

	// residual edges connect nodes that were connected through a
	// separate node, which has been removed from the report.
	Residual bool
	// An inline edge represents a call that was inlined into the caller.
	Inline bool
}

Edge contains any attributes to be represented about edges in a graph.

func (*Edge) WeightValue added in go1.23.0 

func (e *Edge) WeightValue() int64

WeightValue returns the weight value for this edge, normalizing if a divisor is available.

type EdgeMap added in go1.23.0 

type EdgeMap []*Edge

EdgeMap is used to represent the incoming/outgoing edges from a node.

func (*EdgeMap) Add added in go1.23.0 

func (em *EdgeMap) Add(e *Edge)

func (*EdgeMap) Delete added in go1.23.0 

func (em *EdgeMap) Delete(e *Edge)

func (EdgeMap) FindTo added in go1.23.0 

func (em EdgeMap) FindTo(n *Node) *Edge

func (EdgeMap) Sort added in go1.23.0 

func (em EdgeMap) Sort() []*Edge

Sort returns a slice of the edges in the map, in a consistent order. The sort order is first based on the edge weight (higher-to-lower) and then by the node names to avoid flakiness.

func (EdgeMap) Sum added in go1.23.0 

func (em EdgeMap) Sum() int64

Sum returns the total weight for a set of nodes.

type Function 

type Function struct {
	ID         uint64
	Name       string
	SystemName string
	Filename   string
	StartLine  int64
	// contains filtered or unexported fields
}

Function corresponds to Profile.Function

type Graph added in go1.23.0 

type Graph struct {
	Nodes Nodes
}

Graph summarizes a performance profile into a format that is suitable for visualization.

func NewGraph added in go1.23.0 

func NewGraph(prof *Profile, o *Options) *Graph

NewGraph computes a graph from a profile.

func (*Graph) String added in go1.23.0 

func (g *Graph) String() string

String returns a text representation of a graph, for debugging purposes.

type Label 

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

Label corresponds to Profile.Label

type Line 

type Line struct {
	Function *Function
	Line     int64
	// contains filtered or unexported fields
}

Line corresponds to Profile.Line

type Location 

type Location struct {
	ID       uint64
	Mapping  *Mapping
	Address  uint64
	Line     []Line
	IsFolded bool
	// contains filtered or unexported fields
}

Location corresponds to Profile.Location

type Mapping 

type Mapping struct {
	ID              uint64
	Start           uint64
	Limit           uint64
	Offset          uint64
	File            string
	BuildID         string
	HasFunctions    bool
	HasFilenames    bool
	HasLineNumbers  bool
	HasInlineFrames bool
	// contains filtered or unexported fields
}

Mapping corresponds to Profile.Mapping

type Node added in go1.23.0 

type Node struct {
	// Info describes the source location associated to this node.
	Info NodeInfo

	// Function represents the function that this node belongs to. On
	// graphs with sub-function resolution (eg line number or
	// addresses), two nodes in a NodeMap that are part of the same
	// function have the same value of Node.Function. If the Node
	// represents the whole function, it points back to itself.
	Function *Node

	// Values associated to this node. Flat is exclusive to this node,
	// Cum includes all descendents.
	Flat, FlatDiv, Cum, CumDiv int64

	// In and out Contains the nodes immediately reaching or reached by
	// this node.
	In, Out EdgeMap
}

Node is an entry on a profiling report. It represents a unique program location.

func (*Node) AddToEdge added in go1.23.0 

func (n *Node) AddToEdge(to *Node, v int64, residual, inline bool)

AddToEdge increases the weight of an edge between two nodes. If there isn't such an edge one is created.

func (*Node) AddToEdgeDiv added in go1.23.0 

func (n *Node) AddToEdgeDiv(to *Node, dv, v int64, residual, inline bool)

AddToEdgeDiv increases the weight of an edge between two nodes. If there isn't such an edge one is created.

func (*Node) CumValue added in go1.23.0 

func (n *Node) CumValue() int64

CumValue returns the inclusive value for this node, computing the mean if a divisor is available.

func (*Node) FlatValue added in go1.23.0 

func (n *Node) FlatValue() int64

FlatValue returns the exclusive value for this node, computing the mean if a divisor is available.

type NodeInfo added in go1.23.0 

type NodeInfo struct {
	Name              string
	Address           uint64
	StartLine, Lineno int
}

NodeInfo contains the attributes for a node.

func (*NodeInfo) NameComponents added in go1.23.0 

func (i *NodeInfo) NameComponents() []string

NameComponents returns the components of the printable name to be used for a node.

func (*NodeInfo) PrintableName added in go1.23.0 

func (i *NodeInfo) PrintableName() string

PrintableName calls the Node's Formatter function with a single space separator.

type NodeMap added in go1.23.0 

type NodeMap map[NodeInfo]*Node

NodeMap maps from a node info struct to a node. It is used to merge report entries with the same info.

func (NodeMap) FindOrInsertNode added in go1.23.0 

func (nm NodeMap) FindOrInsertNode(info NodeInfo, kept NodeSet) *Node

FindOrInsertNode takes the info for a node and either returns a matching node from the node map if one exists, or adds one to the map if one does not. If kept is non-nil, nodes are only added if they can be located on it.

type NodePtrSet added in go1.23.0 

type NodePtrSet map[*Node]bool

NodePtrSet is a collection of nodes. Trimming a graph or tree requires a set of objects which uniquely identify the nodes to keep. In a graph, NodeInfo works as a unique identifier; however, in a tree multiple nodes may share identical NodeInfos. A *Node does uniquely identify a node so we can use that instead. Though a *Node also uniquely identifies a node in a graph, currently, during trimming, graphs are rebuilt from scratch using only the NodeSet, so there would not be the required context of the initial graph to allow for the use of *Node.

type NodeSet added in go1.23.0 

type NodeSet map[NodeInfo]bool

NodeSet is a collection of node info structs.

type Nodes added in go1.23.0 

type Nodes []*Node

Nodes is an ordered collection of graph nodes.

func CreateNodes added in go1.23.0 

func CreateNodes(prof *Profile, o *Options) (Nodes, locationMap)

CreateNodes creates graph nodes for all locations in a profile. It returns set of all nodes, plus a mapping of each location to the set of corresponding nodes (one per location.Line).

func (Nodes) Sum added in go1.23.0 

func (ns Nodes) Sum() (flat int64, cum int64)

Sum adds the flat and cum values of a set of nodes.

type Options added in go1.23.0 

type Options struct {
	SampleValue       func(s []int64) int64 // Function to compute the value of a sample
	SampleMeanDivisor func(s []int64) int64 // Function to compute the divisor for mean graphs, or nil

	DropNegative bool // Drop nodes with overall negative values

	KeptNodes NodeSet // If non-nil, only use nodes in this set
}

Options encodes the options for constructing a graph

type Profile 

type Profile struct {
	SampleType        []*ValueType
	DefaultSampleType string
	Sample            []*Sample
	Mapping           []*Mapping
	Location          []*Location
	Function          []*Function
	Comments          []string

	DropFrames string
	KeepFrames string

	TimeNanos     int64
	DurationNanos int64
	PeriodType    *ValueType
	Period        int64
	// contains filtered or unexported fields
}

Profile is an in-memory representation of profile.proto.

func Merge 

func Merge(srcs []*Profile) (*Profile, error)

Merge merges all the profiles in profs into a single Profile. Returns a new profile independent of the input profiles. The merged profile is compacted to eliminate unused samples, locations, functions and mappings. Profiles must have identical profile sample and period types or the merge will fail. profile.Period of the resulting profile will be the maximum of all profiles, and profile.TimeNanos will be the earliest nonzero one.

func Parse 

func Parse(r io.Reader) (*Profile, error)

Parse parses a profile and checks for its validity. The input must be an encoded pprof protobuf, which may optionally be gzip-compressed.

func (*Profile) Aggregate 

func (p *Profile) Aggregate(inlineFrame, function, filename, linenumber, address bool) error

Aggregate merges the locations in the profile into equivalence classes preserving the request attributes. It also updates the samples to point to the merged locations.

func (*Profile) CheckValid 

func (p *Profile) CheckValid() error

CheckValid tests whether the profile is valid. Checks include, but are not limited to:

  • len(Profile.Sample[n].value) == len(Profile.value_unit)
  • Sample.id has a corresponding Profile.Location

func (*Profile) Compatible 

func (p *Profile) Compatible(pb *Profile) error

Compatible determines if two profiles can be compared/merged. returns nil if the profiles are compatible; otherwise an error with details on the incompatibility.

func (*Profile) Copy 

func (p *Profile) Copy() *Profile

Copy makes a fully independent copy of a profile.

func (*Profile) Demangle 

func (p *Profile) Demangle(d Demangler) error

Demangle attempts to demangle and optionally simplify any function names referenced in the profile. It works on a best-effort basis: it will silently preserve the original names in case of any errors.

func (*Profile) Empty 

func (p *Profile) Empty() bool

Empty reports whether the profile contains no samples.

func (*Profile) FilterSamplesByTag 

func (p *Profile) FilterSamplesByTag(focus, ignore TagMatch) (fm, im bool)

FilterSamplesByTag removes all samples from the profile, except those that match focus and do not match the ignore regular expression.

func (*Profile) HasFileLines 

func (p *Profile) HasFileLines() bool

HasFileLines determines if all locations in this profile have symbolized file and line number information.

func (*Profile) HasFunctions 

func (p *Profile) HasFunctions() bool

HasFunctions determines if all locations in this profile have symbolized function information.

func (*Profile) Merge 

func (p *Profile) Merge(pb *Profile, r float64) error

Merge adds profile p adjusted by ratio r into profile p. Profiles must be compatible (same Type and SampleType). TODO(rsilvera): consider normalizing the profiles based on the total samples collected.

func (*Profile) Normalize 

func (p *Profile) Normalize(pb *Profile) error

Normalize normalizes the source profile by multiplying each value in profile by the ratio of the sum of the base profile's values of that sample type to the sum of the source profile's value of that sample type.

func (*Profile) Prune 

func (p *Profile) Prune(dropRx, keepRx *regexp.Regexp)

Prune removes all nodes beneath a node matching dropRx, and not matching keepRx. If the root node of a Sample matches, the sample will have an empty stack.

func (*Profile) RemoveUninteresting 

func (p *Profile) RemoveUninteresting() error

RemoveUninteresting prunes and elides profiles using built-in tables of uninteresting function names.

func (*Profile) Scale 

func (p *Profile) Scale(ratio float64)

Scale multiplies all sample values in a profile by a constant.

func (*Profile) ScaleN 

func (p *Profile) ScaleN(ratios []float64) error

ScaleN multiplies each sample values in a sample by a different amount.

func (*Profile) String 

func (p *Profile) String() string

Print dumps a text representation of a profile. Intended mainly for debugging purposes.

func (*Profile) Write 

func (p *Profile) Write(w io.Writer) error

Write writes the profile as a gzip-compressed marshaled protobuf.

type Sample 

type Sample struct {
	Location []*Location
	Value    []int64
	Label    map[string][]string
	NumLabel map[string][]int64
	NumUnit  map[string][]string
	// contains filtered or unexported fields
}

Sample corresponds to Profile.Sample

type TagMatch 

type TagMatch func(key, val string, nval int64) bool

TagMatch selects tags for filtering

type ValueType 

type ValueType struct {
	Type string // cpu, wall, inuse_space, etc
	Unit string // seconds, nanoseconds, bytes, etc
	// contains filtered or unexported fields
}

ValueType corresponds to Profile.ValueType

Source Files

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