Call for TESTING (was Re: [1.7.0-50] scp progress counter flies through first 175 MB or so)
Brian Ford
Brian.Ford@FlightSafety.com
Wed Jul 1 14:40:00 GMT 2009
On Wed, 1 Jul 2009, Corinna Vinschen wrote:
> On Jun 30 14:23, Brian Ford wrote:
> > Even more so for context switches ;-):
> >
> > http://www.cygwin.com/ml/cygwin-developers/2007-10/msg00040.html
> >
> > although this performance penalty was removed from read/write and friends:
> >
> > http://www.cygwin.com/ml/cygwin-developers/2007-12/msg00004.html
> >
> > it is still present for send/recv and friends.
>
> I removed the sig_dispatch_pending calls from send/recv and friends.
Thank you! This should have removed the thread handshake overhead from
most all I/O calls now. I just wish we could figure out a way to avoid
it everywhere unless it is actually necessary. I know, PTC :-).
> Note, however, that this has no influence on the ssh/scp results we were
> talking about in this thread. ssh/scp are using read/write calls.
Sorry, I should have investigated and bench marked the difference.
--
Brian Ford
Staff Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
the best safety device in any aircraft is a well-trained crew...
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