potential instability in cygwin after my last checkin
Conrad Scott
Conrad.Scott@dsl.pipex.com
Thu Aug 1 15:14:00 GMT 2002
"Christopher Faylor" <cgf@redhat.com> wrote:
> So, it's possible that my current implementation is actually
slower than
> the old one. I'll check on that in the next couple of days.
I've just done some timings with a pair of test programs, where
the server echoes everything it's sent and the client repeatedly
sends packets and waits for replies. They also do a select before
each read from the socket (I've got a problem with selects for
writing so that's not in the test program as yet).
Anyhow, timings (done with bash's time command, averages over 3
runs):
Before Chris's changes:
real 29.9 seconds
user 1.8 seconds
system 6.75 seconds
After the changes:
real 23.4
user 1.3
system 4.88
which is a nice 20% improvement, not slower at all.
Just for comparison, the same test w/o any selects:
real 1.1
user 0.15
system 0.30
so there's still some room for improvement :-)
Of course, the other point here is that the code seems to work
fine (I'm also running XEmacs w/ gnuserv and CVS too).
// Conrad
p.s. I've been assuming that bash's time command returns sensible
values for the user and system times: they look plausible. Are
they known to be good?
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