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| 1 | #!/usr/bin/python | |
| 2 | # -*- coding: utf-8 -*- | |
| 3 | ||
| 4 | import os | |
| 5 | import sys | |
| 6 | import time | |
| 7 | ||
| 8 | from multiprocessing import Process, cpu_count | |
| 9 | ||
| 10 | #----------------------------------------------------------------------- | |
| 11 | def log(msg): | |
| 12 | print "[%s %d] %s" % (time.asctime(), os.getpid(), msg) | |
| 13 | ||
| 14 | #----------------------------------------------------------------------- | |
| 15 | def dummy_process(): | |
| 16 | import random | |
| 17 | t = random.randint(0, 2) | |
| 18 | log("Sleeping %d second(s)..." % t)
| |
| 19 | time.sleep(t) | |
| 20 | log("Done, bye")
| |
| 21 | ||
| 22 | #----------------------------------------------------------------------- | |
| 23 | def process_manager(total_procs, target, wait_time=0.2): | |
| 24 | """ Always maintain a total of @total_procs running @target and | |
| 25 | waiting for each thread to finish @wait_time second(s). """ | |
| 26 | procs = [] | |
| 27 | log("Maximum number of processes in pool is %d" % total_procs)
| |
| 28 | while 1: | |
| 29 | if len(procs) < total_procs: | |
| 30 | log("Starting process %d" % (len(procs)+1))
| |
| 31 | p = Process(target=target) | |
| 32 | p.start() | |
| 33 | procs.append(p) | |
| 34 | log("Total of %d process(es) started" % len(procs))
| |
| 35 | else: | |
| 36 | i = 0 | |
| 37 | for p in list(procs): | |
| 38 | p.join(wait_time) | |
| 39 | if not p.is_alive(): | |
| 40 | log("Process finished, deleting and starting a new one...")
| |
| 41 | del procs[i] | |
| 42 | continue | |
| 43 | i += 1 | |
| 44 | ||
| 45 | if __name__ == "__main__": | |
| 46 | total_procs = cpu_count()*5 | |
| 47 | - | manage_pool(total_procs, dummy_process) |
| 47 | + | process_manager(total_procs, dummy_process) |