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Message-ID: <20020626161129.3350.qmail@web10502.mail.yahoo.com>
Date: Wed, 26 Jun 2002 09:11:29 -0700 (PDT)
From: Rick Rankin <rick_rankin AT yahoo DOT com>
Subject: Re: Executing commands is VERY slow when logged into an NT domain....
To: cygwin AT cygwin DOT com
In-Reply-To: <20020626141435.GC28356@redhat.com>
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--- Christopher Faylor <cgf AT redhat DOT com> wrote:
> On Tue, Jun 25, 2002 at 10:06:38PM -0700, Rick Rankin wrote:
> >--- Christopher Faylor <cgf AT redhat DOT com> wrote:
> >> On Tue, Jun 25, 2002 at 09:09:43PM -0700, Rick Rankin wrote:
> >> >Corinna mentioned earlier in this thread that some strace output might be
> >> >helpful. I've attached two strace logs from running 'ls' in an empty
> >> directory.
> >> >The first is using the 1.3.10-1 DLL where don't see the slowdown, the
> second
> >> is
> >> >using the 20020625 snapshot of 1.3.11 where I do. 
> >> 
> >> The microsecond numbers in the 1.3.10 vs. 1.3.11 strace show that 1.3.11
> is
> >> actually slightly faster than 1.3.10:
> >> 
> >> 1.3.10:
> >>  1989  180504 [main] ls 436 _pinfo::exit: Calling ExitProcess 0
> >>        ^^^^^^
> >> 
> >> 1.3.11:
> >>  2447  169876 [main] ls 1480 _pinfo::exit: Calling ExitProcess 0
> >>        ^^^^^^
> >> 
> >> Are you sure you saw a slowdown in this instance?  Because this is
> >> pretty puzzling if so.  Given the fact that we cleaned up some of
> >> the startup code in cygwin for 1.3.11, the above figures are what
> >> I'd expect.
> >
> >Pretty sure. I also ran 'time ls' right after I ran 'strace ls'. Here are
> those
> >results, which I meant to post earlier but forgot. I took these times while
> I
> >was logged in to my domain account and connected to my home network, which
> is
> >when I see the slowdown.
> 
> But, the strace contains its own version of the time command and it is saying
> that the straced 1.3.11 version is not slow.
> 
> Out of curiousity, does mounting your /bin and /usr/bin directories with the
> -X
> option "fix" anything?
> 
> mount -f -b -X c:/cygwin/bin /bin
> mount -f -b -X c:/cygwin/bin /usr/bin
> 
> where c:\cygwin is the location of your root, of course.

I'll try this when I get home this evening. That would certainly be different,
though, because they're not mounted that way now.

> 
> >So for whatever reason, the real time required for ls to do essentially
> nothing
> >is 2.3 seconds longer with the 1.3.11 dll than it is with 1.3.10, while user
> >and system times are more-or-less unchanged.
> 
> Sounds like it is timing out trying to contact something like a domain
> controller,
> maybe?
> 

Well, that's what I assumed, but what's trying to contact the controller? It's
not ls -- I just used that as an example. I see similar results with *all*
commands. When I was looking through the strace output, there seems to be a
function called internal_getlogin, which appears to be operating somewhat
differently between 1.3.10 and 1.3.11. Under 1.3.10, internal_getlogin appears
to call GetLoginName() along with some other functions to determine my login
name, domain, login server, etc. I don't see similar output in the 1.3.11
strace log. Could that be significant?

--Rick

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