How big is a message sent to each client?
Each message is about 40 bytes. A typical loop to send message is 1000 clients, so only 40KB to hold the message for all clients.
-----Original Message----- From: twisted-python-bounces@twistedmatrix.com [mailto:twisted-python- bounces@twistedmatrix.com] On Behalf Of Manlio Perillo Sent: Saturday, December 01, 2007 3:55 AM To: Twisted general discussion Subject: Re: [Twisted-Python] Advise for heavy concurrency
Alec Matusis ha scritto:
You should break the loop into small parts.
Can you explain this? Do you mean, use reactor.callLater to process say 100 messages at a time? Or maybe use deferToThread for the whole loop?
There is also twisted.internet.task.cooperate, but I have never used it.
You see the memory growing because the Python interpreter will not release the memory to the operating system (however the memory should not grow indefinitely)
The memory is actually growing indefinitely. We run 4 identical servers on one machine. The load is not balanced very symmetrically. So one server can have 4500 connections, while another has 6000. There is a certain threshold on the number of connections, when a server starts to leak memory uncontrollably, and it's not set by the highest usage. For example, a server with 4500 connections remains at 100mb RSS for days, while a server that reaches 6000 connections leaks memory to 2gb in 10 hrs (I did not try beyond that, since the machine starts swapping!)
How big is a message sent to each client? That is, how much memory requires to hold all these messages in memory?
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P.S.: your mail user agent does not wraps long lines; can you please fix it?
Manlio Perillo
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