I installed the asyncio Ioloop in tornado project, it ran with no problem with a single request, but when I did server stress test:
ab -n 10000 -c 4000 -p '/home/mwh/ad_tornado/for_test/task.json' -T 'application/x-www-form-urlencoded' '192.168.1.170/hwSdk/tsk/get_t_k.json'
It happened errors:
[E 161216 10:32:22 base_events:1090] Exception in callback BaseAsyncIOLoop._handle_events(11, 1)
handle: <Handle BaseAsyncIOLoop._handle_events(11, 1)>
Traceback (most recent call last):
File "/usr/local/lib/python3.4/asyncio/events.py", line 125, in _run
File "/home/mwh/virtualenv_mwh/lib/python3.4/site-packages/tornado/platform/asyncio.py", line 114, in _handle_events
File "/home/mwh/virtualenv_mwh/lib/python3.4/site-packages/tornado/stack_context.py", line 275, in null_wrapper
File "/home/mwh/virtualenv_mwh/lib/python3.4/site-packages/tornado/netutil.py", line 260, in accept_handler
File "/usr/local/lib/python3.4/socket.py", line 187, in accept
OSError: [Errno 24] Too many open files
Is that use with asynico ioloop in tornado will degrade the performance?
You are trying to run 4000 parallel requests, which means 4000 opened sockets at the same time.
But usually system limits allows only 1024 opened files by default (try ulimit -a).
You could override the limit by ulimit -n 4096 call.