subprocess help

[Влатко Станковиќ]

Hello,
I'm having some sort of 'problem' when using subprocess calls.
This is the code snipet that i am using:

capture_server1 = '''xvfb-run --auto-servernum ... '''
server1_download =
subprocess.Popen(shlex.split(capture_server1),stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)

out_s1, err_s1 = server1_download.communicate()

time.sleep(2)

capture_server2 = '''xvfb-run --auto-servernum .... '''
server2_download = subprocess.Popen(shlex.split(capture_server2),
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
 stderr=subprocess.PIPE)

out_s2, err_s2 = server2_download.communicate()

The problem is the following:
- The program runs in a loop, where subprocess is called
- It runs for X days, sometimes 3 days, sometimes 5 days
- After that i get the following exception:

File "/usr/lib/python2.7/subprocess.py", line 1091, in pipe_cloexec
r, w = os.pipe()
OSError: [Errno 24] Too many open files


How can i reproduce this on a local machine, and how to make sure that i
wont have any errors like this?

P.S. Version 2.7 is used with this program
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