linux – Python无法启动新线程,但不能达到线程限制

我有一个安装了 Python 3的嵌入式系统(armv5tejl AT91SAM9X25,运行基于buildroot的rootfs的128MB RAM).我已经让系统运行了很多天了,我已经开始对它进行一些python开发工作,但似乎遇到了创建新线程的问题.

如果我尝试运行以下程序：

Type "help","copyright","credits" or "license" for more information.
>>> import threading
>>> import time
>>> def func():
...     i = 0
...     while True:
...         i += 1
...         print(i)
...         time.sleep(1)
...
>>>
>>> func()
1
2
3
^CTraceback (most recent call last):
  File "<stdin>",line 1,in <module>
  File "<stdin>",line 6,in func
KeyboardInterrupt
>>> t = threading.Thread(target=func)
>>> t.start()
Traceback (most recent call last):
  File "<stdin>",in <module>
  File "/usr/lib/python3.4/threading.py",line 850,in start
RuntimeError: can't start new thread
>>>

如您所见,在尝试启动线程时,我收到上述错误.一些在线初始搜索似乎表明问题可能是由于系统运行到线程限制.这是ulimit -a的输出：

# ulimit -a
core file size          (blocks,-c) 0
data seg size           (kbytes,-d) unlimited
scheduling priority             (-e) 0
file size               (blocks,-f) unlimited
pending signals                 (-i) 961
max locked memory       (kbytes,-l) 64
max memory size         (kbytes,-m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes,-p) 8
POSIX message queues     (bytes,-q) 819200
real-time priority              (-r) 0
stack size              (kbytes,-s) 8192
cpu time               (seconds,-t) unlimited
max user processes              (-u) 961
virtual memory          (kbytes,-v) unlimited
file locks                      (-x) unlimited

使用this method,我系统上的线程总数是75,这远低于961的限制.这是我当前的内存状态：

# free -m
             total       used       free     shared    buffers     cached
Mem:           120        118          2         60          0         65
-/+ buffers/cache:         52         67
Swap:            0          0          0

我还通过运行echo 1>来运行内存压缩器.的/ proc / sys目录/ VM / compact_memory.

我想如果我重新启动设备一切都会正常工作(因为代码是已知的工作代码),但由于我现在有这种状态的设备,我很想知道问题是什么.