python线程总数限制？

CODE:

import thread

def counter(myId,count):
    for i in range(count):
        stdoutmutex.acquire()
        print '[%s] => %s' %(myId,i)
        stdoutmutex.release()
    exitmutexes[myId].acquire()

stdoutmutex = thread.allocate_lock()
exitmutexes = []

for i in range(2000):
    exitmutexes.append(thread.allocate_lock())
    thread.start_new(counter,(i,100))

for mutex in exitmutexes:
    while not mutex.locked() :pass
print 'Main thread exiting'