@a33291
@thinkershare

麻烦指导下, 分别都是用 dotnet run , go run 直接跑的，cpu 占用差了 1 倍。

```c#
class Entry
{
public static void Main()
{
const int CAL_COUNT = 20000000;
while (true)
{
for (var i = 0; i < CAL_COUNT; i++)
{
double pi = 3.14;
double r = 123.456;

_ = pi * r * r;
}
Thread.Sleep(1000 / 20);
}
}

}
```

```go
package main

import (
"time"
)

const (
CAL_COUNT = 20000000
)

func main() {
for {
for i := 0; i < CAL_COUNT; i++ {
r := 123.456
pi := 3.14
_ = pi * r * r
}
time.Sleep(time.Millisecond * 1000 / 20)
}
}
```