That particular question, no one has answered... in Linux, the scheduler will not go around crazy trying to schedule prcosses that are all waiting on IO. NOw the only time I see a degrade in threads would be if all are runnable.... in that case a async scheme with two threads would let each task run to completion, not thrashing the kernel. Is that correct to say?
----- Original Message -----
From: Terje Eggestad <email@example.com>
Date: 27 Jan 2003 10:48:22 +0100
To: Lee Chin <firstname.lastname@example.org>
Subject: Re: debate on 700 threads vs asynchronous code
> Apart from the argument already given on other replies, you should
> keep in mind that you probably need to give priority to doing receive.
> THat include your clients, but if you don't you run into the risk of
> significantly limiting your bandwidth since the send queues around your
> system fill up.
> Try doing that with threads.
> Actually I would recommend the approach c)
> c) Write an asynchronous system with only 2 or three threads where I
> manage the connections and keep the state of each connection in a data
> On fre, 2003-01-24 at 00:19, Lee Chin wrote:
> > Hi
> > I am discussing with a few people on different approaches to solving a scale problem I am having, and have gotten vastly different views
> > In a nutshell, as far as this debate is concerned, I can say I am writing a web server.
> > Now, to cater to 700 clients, I can
> > a) launch 700 threads that each block on I/O to disk and to the client (in reading and writing on the socket)
> > OR
> > b) Write an asycnhrounous system with only 2 or three threads where I manage the connections and stack (via setcontext swapcontext etc), which is progromatically a little harder
> > Which way will yeild me better performance, considerng both approaches are implemented optimally?
> > Thanks
> > Lee
> Terje Eggestad mailto:email@example.com
> Scali Scalable Linux Systems http://www.scali.com
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