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119

answers:

1
Q: 

Socket.UseOnlyOverlappedIO?

Does anyone know what Socket.UseOnlyOverlappedIO does, and if so, does it affect performance? There seems to be no real explanation on MSDN.

Thanks in advance.

+1  A: 

It causes the socket to used Overlapped I/O instead of blocking. On single processor/single core systems, this can lead to some performance benefits, but it tends to be less useful on multiprocessing systems.

Reed Copsey  2009-11-06 00:14:40
I'm guessing it's useless if I'm already using asynchronous sockets...
Fauxide  2009-11-06 00:44:07
Well, if you're deploying on a dual+ core machine, and using asynchonous sockets, it's useless. On a single core, single processor machine, it's (theoretically) slightly faster for the asynchronous operations.
Reed Copsey  2009-11-06 00:49:06
I probably wouldn't bother, though, since it's pretty much an edge case now, on nearly all hardware.
Reed Copsey  2009-11-06 00:49:37
Do you have a link to something official that explains that? I would have expected the async operations to be using overlapped I/O anyway.
Len Holgate  2009-11-06 08:51:04
The Wikipedia article discusses it, but otherwise, search for OVERLAPPED on MSDN - there's quite a bit of discussion there.
Reed Copsey  2009-11-06 16:52:18
Reed, actually I meant something official for "f you're deploying on a dual+ core machine, and using asynchonous sockets, it's useless. On a single core, single processor machine, it's (theoretically) slightly faster for the asynchronous operations"... I know what Overlapped I/O is...
Len Holgate  2009-11-09 12:52:59

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