[Swift-devel] coaster io with NIO.

[Mihael Hategan]

On Tue, 2012-04-10 at 17:04 -0700, Mihael Hategan wrote:
> On Tue, 2012-04-10 at 17:25 -0500, David Kelly wrote:
> > Yep, I gave it a try with automatic coasters, but am still seeing the timeouts.
> > 
> 
> I think I see the problem. With multiple jobs per worker the situation
> may such be that both a stagein and a stageout happen at the same time
> (on the same TCP connection). If the stageout runs out of buffers the
> writing to the socket on the worker side blocks causing the read loop to
> not happen. This eventually fills the other direction on the TCP link
> and everything deadlocks.

This shouldn't happen if the worker socket write was non-blocking. Let
me play with that a bit.