github.com/m3db/m3@v1.5.1-0.20231129193456-75a402aa583b/src/x/debug/cpu.go (about)

     1  // Copyright (c) 2019 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package debug
    22  
    23  import (
    24  	"io"
    25  	"net/http"
    26  	"runtime/pprof"
    27  	"time"
    28  )
    29  
    30  type cpuProfileSource struct {
    31  	duration time.Duration
    32  }
    33  
    34  // NewCPUProfileSource returns a Source for CPU Profiling, measured
    35  // over the passed duration.
    36  func NewCPUProfileSource(h time.Duration) Source {
    37  	return &cpuProfileSource{duration: h}
    38  }
    39  
    40  func (c *cpuProfileSource) Write(w io.Writer, _ *http.Request) error {
    41  	if err := pprof.StartCPUProfile(w); err != nil {
    42  		return err
    43  	}
    44  
    45  	time.Sleep(c.duration)
    46  	pprof.StopCPUProfile()
    47  
    48  	return nil
    49  }