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POHandle out of range in select
 

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    <p>Many (>1000) workers (process) do some and want to save their work results in database. Result of work is JSON object. Workers produce JSON objects 1-5 per second. Database saver is separated process. Unidirectional connections for transfer JSON object from worker to saver is multiprocessing.Pipe. Number of pipes equal number of workers.</p> <p>In saver process periodically сall:</p> <pre><code>def recv_data(self): data = [] for pipe in self.data_pipe_pool: if pipe.poll(): data.append(pipe.recv()) return data </code></pre> <p>self.data_pipe_pool - list of pipes from workers.</p> <p>All work fine if i run ~100 workers. If i run >1000 workers i get exception:</p> <pre><code>2013-02-13T15:17:40.731429 Traceback (most recent call last): File "saver.py", line 44, in run profile = self.poll_data() File "saver.py", line 116, in poll_data ret = self.recv_data() File "saver_unit.py", line 127, in recv_data if pipe.poll(): IOError: handle out of range in select() </code></pre> <p>I know that this is due with <code>select()</code> call and that:</p> <blockquote> <p>FD_SETSIZE is usually defined to 1024 in GNU/Linux systems</p> </blockquote> <p>But where called <code>select</code>? If in <code>pipe.poll()</code>, why I exceed the FD_SETSIZE limit, i'm calling <code>pipe.poll()</code> for 1 pipe individually? Where can i watch python language sources with this call <code>select</code>?</p> <p>What workaround not exceed <code>FD_SETSIZE</code> limit or not use <code>select</code>?</p>
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