profile

package standard library

go1.19.4 Latest Latest Go to latest Published: Dec 6, 2022 License: BSD-3-Clause Imports: 12 Imported by: 0

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cs.opensource.google/go/go

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Documentation ¶

Overview ¶

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

Constants ¶

This section is empty.

Variables ¶

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var (

	// LegacyHeapAllocated instructs the heapz parsers to use the
	// allocated memory stats instead of the default in-use memory. Note
	// that tcmalloc doesn't provide all allocated memory, only in-use
	// stats.
	LegacyHeapAllocated bool
)

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 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 may be a gzip-compressed encoded protobuf or one of many legacy profile formats which may be unsupported in the future.

func ParseTracebacks ¶

func ParseTracebacks(b []byte) (*Profile, error)

ParseTracebacks parses a set of tracebacks and returns a newly populated profile. It will accept any text file and generate a Profile out of it with any hex addresses it can identify, including a process map if it can recognize one. Each sample will include a tag "source" with the addresses recognized in string format.

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) FilterSamplesByName ¶

func (p *Profile) FilterSamplesByName(focus, ignore, hide *regexp.Regexp) (fm, im, hm bool)

FilterSamplesByName filters the samples in a profile and only keeps samples where at least one frame matches focus but none match ignore. Returns true is the corresponding regexp matched at least one sample.

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) ParseMemoryMap ¶

func (p *Profile) ParseMemoryMap(rd io.Reader) error

ParseMemoryMap parses a memory map in the format of /proc/self/maps, and overrides the mappings in the current profile. It renumbers the samples and locations in the profile correspondingly.

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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