README
¶
profile
Simple profiling support package for Go
installation
go get github.com/pkg/profile
usage
Enabling profiling in your application is as simple as one line at the top of your main function
import "github.com/pkg/profile"
func main() {
defer profile.Start().Stop()
...
}
options
What to profile is controlled by config value passed to profile.Start. By default CPU profiling is enabled.
import "github.com/pkg/profile"
func main() {
// p.Stop() must be called before the program exits to
// ensure profiling information is written to disk.
p := profile.Start(profile.MemProfile, profile.ProfilePath("."), profile.NoShutdownHook)
...
}
Several convenience package level values are provided for cpu, memory, and block (contention) profiling.
For more complex options, consult the documentation.
Documentation
¶
Overview ¶
Package profile provides a simple way to manage runtime/pprof profiling of your Go application.
Index ¶
Examples ¶
Constants ¶
const DefaultMemProfileRate = 4096
DefaultMemProfileRate is the default memory profiling rate. See also http://golang.org/pkg/runtime/#pkg-variables
Variables ¶
This section is empty.
Functions ¶
func BlockProfile ¶
func BlockProfile(p *profile)
BlockProfile controls if block (contention) profiling will be enabled. It disables any previous profiling settings.
func CPUProfile ¶
func CPUProfile(p *profile)
CPUProfile controls if cpu profiling will be enabled. It disables any previous profiling settings.
Example ¶
package main
import (
"github.com/pkg/profile"
)
func main() {
// CPU profiling is the default profiling mode, but you can specify it
// explicitly for completeness.
defer profile.Start(profile.CPUProfile).Stop()
}
Output:
func MemProfile ¶
func MemProfile(p *profile)
MemProfile controls if memory profiling will be enabled. It disables any previous profiling settings.
Example ¶
package main
import (
"github.com/pkg/profile"
)
func main() {
// use memory profiling, rather than the default cpu profiling.
defer profile.Start(profile.MemProfile).Stop()
}
Output:
func MemProfileRate ¶
func MemProfileRate(rate int) func(*profile)
MemProfileRate controls if memory profiling will be enabled. Additionally, it takes a parameter which allows the setting of the memory profile rate.
Example ¶
package main
import (
"github.com/pkg/profile"
)
func main() {
// use memory profiling with custom rate.
defer profile.Start(profile.MemProfileRate(2048)).Stop()
}
Output:
func NoShutdownHook ¶
func NoShutdownHook(p *profile)
NoShutdownHook controls whether the profiling package should hook SIGINT to write profiles cleanly. Programs with more sophisticated signal handling should set this to true and ensure the Stop() function returned from Start() is called during shutdown.
Example ¶
package main
import (
"github.com/pkg/profile"
)
func main() {
// disable the automatic shutdown hook.
defer profile.Start(profile.NoShutdownHook).Stop()
}
Output:
func ProfilePath ¶
func ProfilePath(path string) func(*profile)
ProfilePath controls the base path where various profiling files are written. If blank, the base path will be generated by ioutil.TempDir.
Example ¶
package main
import (
"os"
"github.com/pkg/profile"
)
func main() {
// set the location that the profile will be written to
defer profile.Start(profile.ProfilePath(os.Getenv("HOME")))
}
Output:
func Start ¶
func Start(options ...func(*profile)) interface {
Stop()
}
Start starts a new profiling session. The caller should call the Stop method on the value returned to cleanly stop profiling.
Example ¶
package main
import (
"github.com/pkg/profile"
)
func main() {
// start a simple CPU profile and register
// a defer to Stop (flush) the profiling data.
defer profile.Start().Stop()
}
Output:
Example (WithFlags) ¶
package main
import (
"flag"
"github.com/pkg/profile"
)
func main() {
// use the flags package to selectively enable profiling.
mode := flag.String("profile.mode", "", "enable profiling mode, one of [cpu, mem, block]")
flag.Parse()
switch *mode {
case "cpu":
defer profile.Start(profile.CPUProfile).Stop()
case "mem":
defer profile.Start(profile.MemProfile).Stop()
case "block":
defer profile.Start(profile.BlockProfile).Stop()
default:
// do nothing
}
}
Output:
Types ¶
This section is empty.
Source Files