英文:
Number of specific go routines running
问题
在Go的运行时库中，我们有NumGoroutine()函数来返回当前运行的goroutine总数。我想知道是否有一种简单的方法来获取特定函数运行的goroutine数量？
目前，我可以得到所有goroutine的数量，比如1000个，但我想知道运行func Foo函数的goroutine数量。有可能吗？简单吗？是否值得关注？
英文:
In go's runtime lib we have NumGoroutine() to return the total number of go routines running at that time. I was wondering if there was a simple way of getting the number of go routines running of a specific function?
Currently I have it telling me I have 1000, or whatever, of all go routines but I would like to know I have 500 go routines running func Foo. Possible? Simple? Shouldn't bother with it?
答案1
得分: 8
我很抱歉，如果你对这些数字感兴趣，你需要自己计算goroutines的数量。实现你的目标最简单的方法是直接使用sync/atomic包。
import "sync/atomic"
var counter int64
func example() {
atomic.AddInt64(&counter, 1)
defer atomic.AddInt64(&counter, -1)
// ...
}
当你想要读取计数器的当前值时，请使用atomic.LoadInt64(&counter)。
在程序中拥有几个这样的计数器并不罕见，这样你可以轻松地监控它。例如，可以查看最近发布的groupcache源代码中的CacheStats结构体。
英文:
I'm afraid you have to count the goroutines on your own if you are interested in those numbers. The cheapest way to achieve your goal would be to use the sync/atomic package directly.
import "sync/atomic"
var counter int64
func example() {
atomic.AddInt64(&counter, 1)
defer atomic.AddInt64(&counter, -1)
// ...
}
Use atomic.LoadInt64(&counter) whenever you want to read the current value of the counter.
And it's not uncommon to have a couple of such counters in your program, so that you can monitor it easily. For example, take a look at the CacheStats struct of the recently published groupcache source.
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