github.com/unigraph-dev/dgraph@v1.1.1-0.20200923154953-8b52b426f765/x/profile.go (about)

     1  /*
     2   * Copyright 2017-2018 Dgraph Labs, Inc. and Contributors
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package x
    18  
    19  import (
    20  	"fmt"
    21  	"os"
    22  	"runtime"
    23  
    24  	"github.com/pkg/profile"
    25  	"github.com/spf13/viper"
    26  )
    27  
    28  // Stopper is an interface tasked with stopping the profiling process.
    29  type Stopper interface {
    30  	Stop()
    31  }
    32  
    33  // StartProfile starts a new mode for profiling.
    34  func StartProfile(conf *viper.Viper) Stopper {
    35  	profileMode := conf.GetString("profile_mode")
    36  	switch profileMode {
    37  	case "cpu":
    38  		return profile.Start(profile.CPUProfile)
    39  	case "mem":
    40  		return profile.Start(profile.MemProfile)
    41  	case "mutex":
    42  		return profile.Start(profile.MutexProfile)
    43  	case "block":
    44  		blockRate := conf.GetInt("block_rate")
    45  		runtime.SetBlockProfileRate(blockRate)
    46  		return profile.Start(profile.BlockProfile)
    47  	case "":
    48  		// do nothing
    49  		return noOpStopper{}
    50  	default:
    51  		fmt.Printf("Invalid profile mode: %q\n", profileMode)
    52  		os.Exit(1)
    53  		return noOpStopper{}
    54  	}
    55  }
    56  
    57  type noOpStopper struct{}
    58  
    59  func (noOpStopper) Stop() {}