preempt.go

package main                                                                                                                                       
                                                                                                                                                   
import (                                                                                                                                           
        "net/http"                                                                                                                                 
        "runtime"                                                                                                                                  
)                                                                                                                                                  
                                                                                                                                                   
func cpuEater() {                                                                                                                                  
        var counter uint64                                                                                                                         
                                                                                                                                                   
        for {                                                                                                                                      
                counter += 1                                                                                                                       
                if counter == 0xfffffffffffffffe {                                                                                                 
                        counter = 0                                                                                                                
                }                                                                                                                                  
                runtime.Gosched()                                                                                                                  
        }                                                                                                                                          
}                                                                                                                                                  
                                                                                                                                                   
func handler(w http.ResponseWriter, r *http.Request) {                                                                                             
        w.Write([]byte("Hello World!"))                                                                                                            
}                                                                                                                                                  
                                                                                                                                                   
func main() {                                                                                                                                      
        for i := 0; i < runtime.NumCPU(); i++ {                                                                                                    
                go cpuEater()                                                                                                                      
        }                                                                                                                                          
                                                                                                                                                   
        http.HandleFunc("/", handler)                                                                                                              
                                                                                                                                                   
        if err := http.ListenAndServe(":8080", nil); err != nil {                                                                                  
                panic(err)                                                                                                                         
        }                                                                                                                                          
}