[Twisted-Python] VFS

James Y Knight foom at fuhm.net
Mon Jan 24 14:10:29 EST 2005

On Jan 24, 2005, at 11:42 AM, Andrea Arcangeli wrote:
> Only one hint for you, please make sure to run all fs calls with a
> thread pool, and never do a vfs call that doesn't support poll(2) 
> within
> the main twisted thread. All I/O calls are synchronous and they block
> the main thread completely. Best would be to support kernel
> asynchronous I/O natively in the reactor, but that depends on linux at
> least, so having a posix threaded abstraction for aio would be ok even
> if lower performant than kernel aio (note that the kernel is going to
> use threads too for aio, the only advantage is that they're kernel
> threads instead of user threads, so with multiple apps and not only
> twisted running, they can save some tlb flush, plus there is some other
> advantage, but having threaded aio inside twisted without kernel 
> support
> would be already pretty good).

I'm working on this, but as an aside from web2, which is an aside from 
work, so not very quickly. :)


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