我尝试使用以下命令在我的 ubuntu 22.04 上运行一个进程的 pprof：go tool pprof http://localhost:9091/debug/pprof/profile，当目标进程以轻量级运行时
我尝试使用以下命令获取在我的 ubuntu 22.04 上运行的一个进程的 pprof： go tool pprof http://localhost:9091/debug/pprof/profile
好吧，当目标进程在轻负载下运行时，这个命令可以给我一个有效的 pprof 结果，但这毫无意义。
当目标进程运行繁忙时，正如我所料，消耗了大约 200％ 的 CPU。 上面的命令将卡住并且根本无法结束。
ENV：unbuntu 22.04go：1.22.3pprof：最新安装（go install github.com/google/pprof@latest）
我尝试获取卡住的 pprof 的堆栈，如下所示：
#0 runtime.futex () at /usr/local/go/src/runtime/sys_linux_amd64.s:558
#1 0x0000000000439bf0 in runtime.futexsleep (addr=0xfffffffffffffe00, val=0, ns=4671651) at /usr/local/go/src/runtime/os_linux.go:69
#2 0x0000000000411ac7 in runtime.notesleep (n=0xd2c5c0 <runtime.m0+320>) at /usr/local/go/src/runtime/lock_futex.go:170
#3 0x0000000000445133 in runtime.mPark () at /usr/local/go/src/runtime/proc.go:1761
#4 runtime.stoplockedm () at /usr/local/go/src/runtime/proc.go:3026
#5 0x000000000044745a in runtime.schedule () at /usr/local/go/src/runtime/proc.go:3847
#6 0x0000000000447aac in runtime.park_m (gp=0xc0001be380) at /usr/local/go/src/runtime/proc.go:4036
#7 0x0000000000470a6e in runtime.mcall () at /usr/local/go/src/runtime/asm_amd64.s:458
#8 0x00007fff5315c688 in ?? ()
#9 0x00000000004753ff in runtime.newproc (fn=0x47096f <runtime.rt0_go+303>) at <autogenerated>:1
#10 0x00000000004709e5 in runtime.mstart () at /usr/local/go/src/runtime/asm_amd64.s:394
#11 0x000000000047096f in runtime.rt0_go () at /usr/local/go/src/runtime/asm_amd64.s:358
#12 0x0000000000000002 in ?? ()
#13 0x00007fff5315c6d8 in ?? ()
#14 0x00007fff5315c6d0 in ?? ()
#15 0x0000000000000002 in ?? ()
#16 0x00007fff5315c6d8 in ?? ()
#17 0x0000777de028b2ca in _dl_start_user () from /lib64/ld-linux-x86-64.so.2
#18 0x0000000000000002 in ?? ()
#19 0x00007fff5315da7b in ?? ()
#20 0x00007fff5315daa4 in ?? ()
#21 0x0000000000000000 in ?? ()
看起来 pprof 正在按照计划休眠，很难知道原因。
我确信这个卡住和工作负载有关，因为当通过在客户端设置睡眠时间（例如“sleep(10)”）来调整工作负载时，pprof 也会卡住一段时间，但最终可以返回结果。
有人有处理过此类案件吗？
我的服务器代码在 golangpackage mainimport 中（\'fmt\' \'log\' \'net/http\' \'github.com/rs/cors\'）func main() { mux := http.NewServeMux();...
我的服务器代码用 golang 编写
package main
import (
"fmt"
"log"
"net/http"
"github.com/rs/cors"
)
func main() {
mux := http.NewServeMux();
mux.HandleFunc("/sse" , handleSse)
c := cors.New(cors.Options{
AllowedOrigins: []string{"*"},
AllowedMethods: []string{http.MethodGet, http.MethodPost,
http.MethodDelete , http.MethodPut},
AllowCredentials: true,
})
handler := c.Handler(mux)
log.Fatal(http.ListenAndServe(":6969" , handler))
}
func handleSse(w http.ResponseWriter , r * http.Request){
w.Header().Set("Content-type","text/event-stream")
w.Header().Set("Cache-Control","no-cache")
w.Header().Set("Connection","keep-alive")
f , ok := w.(http.Flusher);
if !ok{
http.Error( w , "SSE not supported" ,
http.StatusBadRequest)
return;
}
fmt.Fprintf(w,"data:%v\n\n","sample data");
f.Flush();
}
客户端代码
<!DOCTYPE html>
<html lang="en">
<head>
<title>SSE</title>
</head>
<body>
SSE running
<script>
const event = new EventSource("http://localhost:6969/sse");
event.onmessage = () =>{
console.log("this dude is slow");
};
</script>
</body>
</html>
我遇到的问题是，在网络选项卡中，新的文本流或响应在 5.4 秒后出现。我希望服务器每 2 秒发送一次响应，我尝试在服务器代码中使用无限 for 循环，如某些教程中所示，但它不起作用
编辑：for 循环处理程序函数
func handleSse(w http.ResponseWriter , r * http.Request){
w.Header().Set("Content-type","text/event-stream")
w.Header().Set("Cache-Control","no-cache")
w.Header().Set("Connection","keep-alive")
w.WriteHeader(http.StatusOK)
f , ok := w.(http.Flusher);
if !ok{
http.Error( w , "SSE not supported , IE6 bruh" ,
http.StatusBadRequest)
return;
}
for i := 0 ; i < 10 ; i++{
fmt.Fprintln(w,"retry : 1000"); //This line also doesnot help
fmt.Fprintf(w,"data :%v\n\n","Sorry");
f.Flush();
//time.Sleep(1 * time.Second) //This line increase delay to 25 secs
}
}