driver

Documentation

Overview

Package driver provides an external entry point to the pprof driver.

Index

• func PProf(o *Options) error
• type Fetcher
• type FlagSet
• type Frame
• type HTTPServerArgs
• type Inst
• type MappingSources
• type ObjFile
• type ObjTool
• type Options
• type Sym
• type Symbolizer
• type UI
• type Writer

Functions

func PProf

func PProf(o *Options) error

PProf acquires a profile, and symbolizes it using a profile manager. Then it generates a report formatted according to the options selected through the flags package.

Types

type Fetcher

type Fetcher interface {
	Fetch(src string, duration, timeout time.Duration) (*profile.Profile, string, error)
}

A Fetcher reads and returns the profile named by src, using the specified duration and timeout. It returns the fetched profile and a string indicating a URL from where the profile was fetched, which may be different than src.

type FlagSet

type FlagSet interface {
	// Bool, Int, Float64, and String define new flags,
	// like the functions of the same name in package flag.
	Bool(name string, def bool, usage string) *bool
	Int(name string, def int, usage string) *int
	Float64(name string, def float64, usage string) *float64
	String(name string, def string, usage string) *string

	// StringList is similar to String but allows multiple values for a
	// single flag
	StringList(name string, def string, usage string) *[]*string

	// ExtraUsage returns any additional text that should be printed after the
	// standard usage message. The extra usage message returned includes all text
	// added with AddExtraUsage().
	// The typical use of ExtraUsage is to show any custom flags defined by the
	// specific pprof plugins being used.
	ExtraUsage() string

	// AddExtraUsage appends additional text to the end of the extra usage message.
	AddExtraUsage(eu string)

	// Parse initializes the flags with their values for this run
	// and returns the non-flag command line arguments.
	// If an unknown flag is encountered or there are no arguments,
	// Parse should call usage and return nil.
	Parse(usage func()) []string
}

A FlagSet creates and parses command-line flags. It is similar to the standard flag.FlagSet.

type Frame

type Frame struct {
	Func string // name of function
	File string // source file name
	Line int    // line in file
}

A Frame describes a single line in a source file.

type HTTPServerArgs

type HTTPServerArgs plugin.HTTPServerArgs

HTTPServerArgs contains arguments needed by an HTTP server that is exporting a pprof web interface.

type Inst

type Inst struct {
	Addr     uint64 // virtual address of instruction
	Text     string // instruction text
	Function string // function name
	File     string // source file
	Line     int    // source line
}

An Inst is a single instruction in an assembly listing.

type MappingSources

type MappingSources map[string][]struct {
	Source string // URL of the source the mapping was collected from
	Start  uint64 // delta applied to addresses from this source (to represent Merge adjustments)
}

MappingSources map each profile.Mapping to the source of the profile. The key is either Mapping.File or Mapping.BuildId.

type ObjFile

type ObjFile interface {
	// Name returns the underlying file name, if available.
	Name() string

	// ObjAddr returns the objdump address corresponding to a runtime address.
	ObjAddr(addr uint64) (uint64, error)

	// BuildID returns the GNU build ID of the file, or an empty string.
	BuildID() string

	// SourceLine reports the source line information for a given
	// address in the file. Due to inlining, the source line information
	// is in general a list of positions representing a call stack,
	// with the leaf function first.
	SourceLine(addr uint64) ([]Frame, error)

	// Symbols returns a list of symbols in the object file.
	// If r is not nil, Symbols restricts the list to symbols
	// with names matching the regular expression.
	// If addr is not zero, Symbols restricts the list to symbols
	// containing that address.
	Symbols(r *regexp.Regexp, addr uint64) ([]*Sym, error)

	// Close closes the file, releasing associated resources.
	Close() error
}

An ObjFile is a single object file: a shared library or executable.

type ObjTool

type ObjTool interface {
	// Open opens the named object file. If the object is a shared
	// library, start/limit/offset are the addresses where it is mapped
	// into memory in the address space being inspected. If the object
	// is a linux kernel, relocationSymbol is the name of the symbol
	// corresponding to the start address.
	Open(file string, start, limit, offset uint64, relocationSymbol string) (ObjFile, error)

	// Disasm disassembles the named object file, starting at
	// the start address and stopping at (before) the end address.
	Disasm(file string, start, end uint64, intelSyntax bool) ([]Inst, error)
}

An ObjTool inspects shared libraries and executable files.

type Options

type Options struct {
	Writer        Writer
	Flagset       FlagSet
	Fetch         Fetcher
	Sym           Symbolizer
	Obj           ObjTool
	UI            UI
	HTTPServer    func(*HTTPServerArgs) error
	HTTPTransport http.RoundTripper
}

Options groups all the optional plugins into pprof.

type Sym

type Sym struct {
	Name  []string // names of symbol (many if symbol was dedup'ed)
	File  string   // object file containing symbol
	Start uint64   // start virtual address
	End   uint64   // virtual address of last byte in sym (Start+size-1)
}

A Sym describes a single symbol in an object file.

type Symbolizer

type Symbolizer interface {
	Symbolize(mode string, srcs MappingSources, prof *profile.Profile) error
}

A Symbolizer introduces symbol information into a profile.

type UI

type UI interface {
	// Read returns a line of text (a command) read from the user.
	// prompt is printed before reading the command.
	ReadLine(prompt string) (string, error)

	// Print shows a message to the user.
	// It formats the text as fmt.Print would and adds a final \n if not already present.
	// For line-based UI, Print writes to standard error.
	// (Standard output is reserved for report data.)
	Print(...interface{})

	// PrintErr shows an error message to the user.
	// It formats the text as fmt.Print would and adds a final \n if not already present.
	// For line-based UI, PrintErr writes to standard error.
	PrintErr(...interface{})

	// IsTerminal returns whether the UI is known to be tied to an
	// interactive terminal (as opposed to being redirected to a file).
	IsTerminal() bool

	// WantBrowser indicates whether browser should be opened with the -http option.
	WantBrowser() bool

	// SetAutoComplete instructs the UI to call complete(cmd) to obtain
	// the auto-completion of cmd, if the UI supports auto-completion at all.
	SetAutoComplete(complete func(string) string)
}

A UI manages user interactions.

type Writer

type Writer interface {
	Open(name string) (io.WriteCloser, error)
}

Writer provides a mechanism to write data under a certain name, typically a filename.