[asterisk-dev] Asterisk scalability

[Ron Arts]

Dan Kegel has written an interesting page on the C10K problem:

http://www.kegel.com/c10k.html

A worthwhile read.

Ron

Benny Amorsen schreef:
> Johansson Olle E <oej at edvina.net> writes:
> 
>> Now, can anyone start a discussion on the way we handle threads? If we  
>> run on a quad-core or a system with dual quad core CPUs, we have  
>> capactiy for an enormous quantity of calls, with at least one thread  
>> per call. Can a modern Linux/Unix thread scheduler handle 10 000  
>> threads efficently?
> 
> The scheduler shouldn't be a problem (the kernel list will think
> you're crazy though). However, it isn't just the scheduler that is the
> problem. Performance will depend a lot on what those threads are
> doing. It will be very hard to avoid cache misses with 10000 threads
> running, unless they are all running approximately the same code at
> the same time.
> 
> Traditionally, the way to get high performance has been to have a set
> of worker threads and then a central loop which passes jobs to those
> threads. The number of threads would then be equal to the number of
> CPU's plus the number of outstanding I/O requests. You could in theory
> avoid the I/O threads by doing async I/O, but Linux async I/O isn't
> all that mature.
> 
> 
> /Benny
> 
> 
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