On Thursday, November 1, 2018 at 12:20:39 PM UTC-4, Ian Lance Taylor wrote:
>
>
> Every blocking cgo call requires a thread. Also every Go program has
> a supporting thread that monitors the programs. If you see only 4
> threads for that program then I think we're doing pretty well.
>
> Ian
>
I wasn't implying that seeing 4 threads with GOMAXPROCS=1 was good or bad.
Just that it was surprising.
Running that program with GOMAXPROCS=1 I still find 4 threads surprising.
It sounds like I should see 3 threads: the monitor thread, the thread for
the main goroutine and one more for the blocking Cgo call. Do 2 threads get
created for the Cgo call?
If I run the following program,
package main
func main() {
for {
}
}
with GOMAXPROCS=1 I see 3 threads. Which is also one more than I was
expecting.
Again, not implying that this is good or bad. I would just like to know if
there is some way to predict the number of threads a Go program will create.
Michael.
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