调优¶

Python Tracebacker¶

要启用这个回溯器，你需要添加选项 py-tracebacker=<socket>,，其中，<socket> 是已创建 UNIX socket 的 basename
如果你有 4 个 uWSGI worker，并且添加了 py-tracebacker=/tmp/tbsocket，那么将会创建名字从 /tmp/tbsocket1 到 /tmp/tbsocket4 的 4 个 socket。
连接到其中任意一个都将会返回 worker 中运行的线程的当前回溯。
你可以使用你最喜欢的应用或方法来连接到那些 socket，但是 uWSGI 有一个供你使用的方便的选项 connect-and-read
```
uwsgi --connect-and-read /tmp/tbsocket1
```

写一个名为 slow.py 的蠢蠢的测试应用:

import time

def dormi():
  time.sleep(60)

def dormi2():
  dormi()

def dormi3():
  dormi2()

def dormi4():
  dormi3()

def dormi5():
  dormi4()

def application(e, start_response):
  start_response('200 OK', [('Content-Type', 'text/html')])
  dormi5()
  return "hello"

运行:

$ uwsgi --http :8080 -w slow --master --processes 2 --threads 4 --py-tracebacker /tmp/tbsocket.
*** uWSGI is running in multiple interpreter mode ***
spawned uWSGI master process (pid: 8955)
spawned uWSGI worker 1 (pid: 8956, cores: 4)
spawned uWSGI worker 2 (pid: 8957, cores: 4)
spawned uWSGI http 1 (pid: 8958)
python tracebacker for worker 1 available on /tmp/tbsocket.1
python tracebacker for worker 2 available on /tmp/tbsocket.2

创建一堆到它的请求:

curl http://localhost:8080 &
curl http://localhost:8080 &
curl http://localhost:8080 &
curl http://localhost:8080 &

当这些请求运行的时候 (每个都会花费几乎一分钟来完成)，你就可以检索回溯:

./uwsgi --connect-and-read /tmp/tbsocket.1
./uwsgi --connect-and-read /tmp/tbsocket.2

回溯器的输出将会是这样的:

*** uWSGI Python tracebacker output ***

thread_id = uWSGIWorker1Core1 filename = ./slow.py lineno = 22 function = application line = dormi5()
thread_id = uWSGIWorker1Core1 filename = ./slow.py lineno = 14 function = dormi5 line = def dormi5(): dormi4()
thread_id = uWSGIWorker1Core1 filename = ./slow.py lineno = 13 function = dormi4 line = def dormi4(): dormi3()
thread_id = uWSGIWorker1Core1 filename = ./slow.py lineno = 12 function = dormi3 line = def dormi3(): dormi2()
thread_id = uWSGIWorker1Core1 filename = ./slow.py lineno = 11 function = dormi2 line = def dormi2(): dormi()
thread_id = uWSGIWorker1Core1 filename = ./slow.py lineno = 9 function = dormi line = time.sleep(60)

thread_id = uWSGIWorker1Core3 filename = ./slow.py lineno = 22 function = application line = dormi5()
thread_id = uWSGIWorker1Core3 filename = ./slow.py lineno = 14 function = dormi5 line = def dormi5(): dormi4()
thread_id = uWSGIWorker1Core3 filename = ./slow.py lineno = 13 function = dormi4 line = def dormi4(): dormi3()
thread_id = uWSGIWorker1Core3 filename = ./slow.py lineno = 12 function = dormi3 line = def dormi3(): dormi2()
thread_id = uWSGIWorker1Core3 filename = ./slow.py lineno = 11 function = dormi2 line = def dormi2(): dormi()
thread_id = uWSGIWorker1Core3 filename = ./slow.py lineno = 9 function = dormi line = time.sleep(60)