现象
在用 jmeter 对 Django 的服务进行压力测试的时候，当并发量上到一定的数量时（我压测的时候用了1000），服务器进程崩了，并报了错：

Traceback (most recent call last):
File "manage.py", line 21, in
File "manage.py", line 17, in main
File "/home/xiaojie/.conda/envs/xiaojie/lib/python3.7/site-packages/django/core/management/init.py", line 381, in execute_from_command_line
File "/home/xiaojie/.conda/envs/xiaojie/lib/python3.7/site-packages/django/core/management/init.py", line 375, in execute
File "/home/xiaojie/.conda/envs/xiaojie/lib/python3.7/site-packages/django/core/management/base.py", line 323, in run_from_argv
File "/home/xiaojie/.conda/envs/xiaojie/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 60, in execute
File "/home/xiaojie/.conda/envs/xiaojie/lib/python3.7/site-packages/django/core/management/base.py", line 364, in execute
File "/home/xiaojie/.conda/envs/xiaojie/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 95, in handle
File "/home/xiaojie/.conda/envs/xiaojie/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 102, in run
File "/home/xiaojie/.conda/envs/xiaojie/lib/python3.7/site-packages/django/utils/autoreload.py", line 585, in run_with_reloader
File "/home/xiaojie/.conda/envs/xiaojie/lib/python3.7/site-packages/django/utils/autoreload.py", line 570, in start_django
File "/home/xiaojie/.conda/envs/xiaojie/lib/python3.7/site-packages/django/utils/autoreload.py", line 288, in run
File "/home/xiaojie/.conda/envs/xiaojie/lib/python3.7/site-packages/django/utils/autoreload.py", line 294, in run_loop
File "/home/xiaojie/.conda/envs/xiaojie/lib/python3.7/site-packages/django/utils/autoreload.py", line 334, in tick
File "/home/xiaojie/.conda/envs/xiaojie/lib/python3.7/site-packages/django/utils/autoreload.py", line 350, in snapshot_files
File "/home/xiaojie/.conda/envs/xiaojie/lib/python3.7/site-packages/django/utils/autoreload.py", line 254, in watched_files
File "/home/xiaojie/.conda/envs/xiaojie/lib/python3.7/pathlib.py", line 1102, in glob
File "/home/xiaojie/.conda/envs/xiaojie/lib/python3.7/pathlib.py", line 562, in _select_from
File "/home/xiaojie/.conda/envs/xiaojie/lib/python3.7/pathlib.py", line 519, in _select_from
OSError: [Errno 24] Too many open files: '/home/xiaojie/.conda/envs/xiaojie/lib/python3.7/site-packages/django/contrib/admin/locale'
2. 问题
经过搜索查找，是系统层面上的报错，服务器的 Linux 系统同时打开的文件数有限制。

This is a system-level thing - you need to increase your ulimit for file handles (it's likely a small change in that patch version resulted in more file handles). I can't give instructions here for every OS, but if you search for ulimit file handles and your OS name you should find instructions on how to raise it.
3. 解决
更改系统配置