erigon-pulse/metrics/runtime_test.go

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package metrics
import (
"runtime"
"testing"
"time"
)
func TestRuntimeMemStatsBlocking(t *testing.T) {
if g := runtime.GOMAXPROCS(0); g < 2 {
t.Skipf("skipping TestRuntimeMemStatsBlocking with GOMAXPROCS=%d\n", g)
}
ch := make(chan int)
go testRuntimeMemStatsBlocking(ch)
var memStats runtime.MemStats
t0 := time.Now()
runtime.ReadMemStats(&memStats)
t1 := time.Now()
t.Log("i++ during runtime.ReadMemStats:", <-ch)
go testRuntimeMemStatsBlocking(ch)
d := t1.Sub(t0)
t.Log(d)
time.Sleep(d)
t.Log("i++ during time.Sleep:", <-ch)
}
func testRuntimeMemStatsBlocking(ch chan int) {
i := 0
for {
select {
case ch <- i:
return
default:
i++
}
}
}