github.com/aigarnetwork/aigar@v0.0.0-20191115204914-d59a6eb70f8e/metrics/debug_test.go (about)

     1  //  Copyright 2018 The go-ethereum Authors
     2  //  Copyright 2019 The go-aigar Authors
     3  //  This file is part of the go-aigar library.
     4  //
     5  //  The go-aigar library is free software: you can redistribute it and/or modify
     6  //  it under the terms of the GNU Lesser General Public License as published by
     7  //  the Free Software Foundation, either version 3 of the License, or
     8  //  (at your option) any later version.
     9  //
    10  //  The go-aigar library is distributed in the hope that it will be useful,
    11  //  but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    13  //  GNU Lesser General Public License for more details.
    14  //
    15  //  You should have received a copy of the GNU Lesser General Public License
    16  //  along with the go-aigar library. If not, see <http://www.gnu.org/licenses/>.
    17  
    18  package metrics
    19  
    20  import (
    21  	"runtime"
    22  	"runtime/debug"
    23  	"testing"
    24  	"time"
    25  )
    26  
    27  func BenchmarkDebugGCStats(b *testing.B) {
    28  	r := NewRegistry()
    29  	RegisterDebugGCStats(r)
    30  	b.ResetTimer()
    31  	for i := 0; i < b.N; i++ {
    32  		CaptureDebugGCStatsOnce(r)
    33  	}
    34  }
    35  
    36  func TestDebugGCStatsBlocking(t *testing.T) {
    37  	if g := runtime.GOMAXPROCS(0); g < 2 {
    38  		t.Skipf("skipping TestDebugGCMemStatsBlocking with GOMAXPROCS=%d\n", g)
    39  		return
    40  	}
    41  	ch := make(chan int)
    42  	go testDebugGCStatsBlocking(ch)
    43  	var gcStats debug.GCStats
    44  	t0 := time.Now()
    45  	debug.ReadGCStats(&gcStats)
    46  	t1 := time.Now()
    47  	t.Log("i++ during debug.ReadGCStats:", <-ch)
    48  	go testDebugGCStatsBlocking(ch)
    49  	d := t1.Sub(t0)
    50  	t.Log(d)
    51  	time.Sleep(d)
    52  	t.Log("i++ during time.Sleep:", <-ch)
    53  }
    54  
    55  func testDebugGCStatsBlocking(ch chan int) {
    56  	i := 0
    57  	for {
    58  		select {
    59  		case ch <- i:
    60  			return
    61  		default:
    62  			i++
    63  		}
    64  	}
    65  }