expectperl-discuss

Re: [Expectperl-discuss] help!!

[Roland G. <RGi...@cp...>]

Zitat von Alan Jiang <al...@ra...>:

> Hi,
> I have an emergency problem that I need your help. I have just
> installed  expect-1.15 on redhat 9.0 and receive the following warning
> message:
>  
> Warning: your default pty can only handle 155 bytes at a time!
> ok 30
>  
> This warning message didn't come up during the installation on
> !!!redhat  7.1!!!! 
> I use your expect module to work with rsync to synchronize two
> website. 
> It now takes forever to update (serveral runs for just one small
> file). 
> Can you please tell me how this problem can be solved? Thanks.

well, this is a linux kernel problem, somebody decided that ptys need
not handle lines longer than 155 bytes at a time, so there. I'm just the
messenger, talk to redhat about that issue. normally it should work
anyway, but theres no guarantee. but are you sure that it is this issue
that is causing the problem? maybe its located somewhere else? have you
tried the rsync procedure manually? tried to find where the time is lost
in the expect script?

-- 
RGi...@cp...

Re: [Expectperl-discuss] help!!

[<db...@CT...>]

I tried reproducing the slowness problem you mentioned since one of my
boxes is Redhat 9 but was unable.

I tried the following:

     1.) scripting lengthy "ls -la" in a telnet session to remote machine.
     2.) scripting rsync <username>@<hostname>:<remotefile> <localfile> for
JPG file about 160K in size.

When installing modules, I got the same "default pty only handles 155
bytes" message, also another message saying that raw pty was ok, and
handled 512+ bytes.  This was when running "make test" on the Expect
module.   Setting both $exp->raw_pty(1) and $exp->raw_pty(0) on different
trial runs before spawning either process didn't seem to make a difference.
Both processes took just a second or so each.

I'm trying to think of what could be causing your problem.  If you're using
Expect to spawn rsync, it's the rsync process that's moving the data; not
expect.  expect is just it's parent and thus getting STDOUT from the rsync
process, so I'm thinking the amount of data rsync is moving between the
websites in itself should be irrelevant.  Are you running the most current
versions of everything?  If you can post some of the relevant code I'll
take a look when I get a minute






                                                                                                                                       
                    Alan Jiang <al...@ra...>                                                                                  
                    Sent by:                                    To:     expect <ex...@ih...>                                   
                    exp...@li...urc        cc:     exp...@li...                       
                    eforge.net                                  Subject:     Re: [Expectperl-discuss] help!!                           
                                                                                                                                       
                                                                                                                                       
                    07/14/03 08:03 PM                                                                                                  
                                                                                                                                       
                                                                                                                                       




I am quite sure it is a expect problem because if I run the rsync process
independent of expect (i.e. manually entering the password at the prompt
insteading of having expect module to automate the procedure), everything
runs just fine. One more piece of evidence is that I didn't get this
warning message about default pty can only handle 155 bytes when I
installed it on redhat 7.2, and the module works perfect on that system. I
wonder if rehhat 9.0 is doing something funny that messes up the expect
module.

Alan


 On Mon, 14
Jul 2003, expect wrote:

> On Mon, 14 Jul 2003 13:14:42 -0400 (EDT)
> Alan Jiang <al...@ra...> wrote:
>
> > Hi,
> > I have an emergency problem that I need your help. I have just
installed
> > expect-1.15 on redhat 9.0 and receive the following warning message:
> >
> > Warning: your default pty can only handle 155 bytes at a time!
> > ok 30
> >
> > This warning message didn't come up during the installation on
!!!redhat
> > 7.1!!!!
> > I use your expect module to work with rsync to synchronize two website.

> > It now takes forever to update (serveral runs for just one small file).

> > Can you please tell me how this problem can be solved? Thanks.
> >
> > Alan
>
> You probably need to convince me that it's an Expect problem.
> You haven't so far.
>
> Maybe you can wrap some timings around things using
> use Benchmark;
>
> to make your case.
>
> >
> >
> >
> >
> > -------------------------------------------------------
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> > Exp...@li...
> > https://lists.sourceforge.net/lists/listinfo/expectperl-discuss
> >
> >
>
>
>
>
> -------------------------------------------------------
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>



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Re: [Expectperl-discuss] help!!

[Alan J. <al...@ra...>]

Thanks for the prompt reply. As you have suggested, I have included the 
script below. Maybe that can give you a clue as to what is going wrong. 
Thanks for the help.

-----------------------------------------------------------------------------
#!/usr/bin/perl

use Expect;

#change the source and destination path here!
$ssh=Expect->spawn("rsync -avzu --delete --progress --stats --rsync-path /path-to-rsync -e ssh /source-path account\@xxx.edu:/destination-path");


# No changes needed from here on
$ssh->expect(10,"ssword: ") || die "Never got password prompt on rci.rutgers.edu, ".$ssh->exp_error()."\n";

# We got the prompt, so send a password.
    print $ssh "xxxxxxx";
    $match=$ssh->expect(10,"closed by foreign host","-re",'[%>$]\s');
    die "Files have been updated on xxx.edu\n" unless $match;
    $ssh->hard_close();

--------------------------------------------------------------------------

 On Tue, 15 Jul 2003 db...@ct... wrote:

> 
> I tried reproducing the slowness problem you mentioned since one of my
> boxes is Redhat 9 but was unable.
> 
> I tried the following:
> 
>      1.) scripting lengthy "ls -la" in a telnet session to remote machine.
>      2.) scripting rsync <username>@<hostname>:<remotefile> <localfile> for
> JPG file about 160K in size.
> 
> When installing modules, I got the same "default pty only handles 155
> bytes" message, also another message saying that raw pty was ok, and
> handled 512+ bytes.  This was when running "make test" on the Expect
> module.   Setting both $exp->raw_pty(1) and $exp->raw_pty(0) on different
> trial runs before spawning either process didn't seem to make a difference.
> Both processes took just a second or so each.
> 
> I'm trying to think of what could be causing your problem.  If you're using
> Expect to spawn rsync, it's the rsync process that's moving the data; not
> expect.  expect is just it's parent and thus getting STDOUT from the rsync
> process, so I'm thinking the amount of data rsync is moving between the
> websites in itself should be irrelevant.  Are you running the most current
> versions of everything?  If you can post some of the relevant code I'll
> take a look when I get a minute
> 
> 
> 
> 
> 
> 
>                                                                                                                                        
>                     Alan Jiang <al...@ra...>                                                                                  
>                     Sent by:                                    To:     expect <ex...@ih...>                                   
>                     exp...@li...urc        cc:     exp...@li...                       
>                     eforge.net                                  Subject:     Re: [Expectperl-discuss] help!!                           
>                                                                                                                                        
>                                                                                                                                        
>                     07/14/03 08:03 PM                                                                                                  
>                                                                                                                                        
>                                                                                                                                        
> 
> 
> 
> 
> I am quite sure it is a expect problem because if I run the rsync process
> independent of expect (i.e. manually entering the password at the prompt
> insteading of having expect module to automate the procedure), everything
> runs just fine. One more piece of evidence is that I didn't get this
> warning message about default pty can only handle 155 bytes when I
> installed it on redhat 7.2, and the module works perfect on that system. I
> wonder if rehhat 9.0 is doing something funny that messes up the expect
> module.
> 
> Alan
> 
> 
>  On Mon, 14
> Jul 2003, expect wrote:
> 
> > On Mon, 14 Jul 2003 13:14:42 -0400 (EDT)
> > Alan Jiang <al...@ra...> wrote:
> >
> > > Hi,
> > > I have an emergency problem that I need your help. I have just
> installed
> > > expect-1.15 on redhat 9.0 and receive the following warning message:
> > >
> > > Warning: your default pty can only handle 155 bytes at a time!
> > > ok 30
> > >
> > > This warning message didn't come up during the installation on
> !!!redhat
> > > 7.1!!!!
> > > I use your expect module to work with rsync to synchronize two website.
> 
> > > It now takes forever to update (serveral runs for just one small file).
> 
> > > Can you please tell me how this problem can be solved? Thanks.
> > >
> > > Alan
> >
> > You probably need to convince me that it's an Expect problem.
> > You haven't so far.
> >
> > Maybe you can wrap some timings around things using
> > use Benchmark;
> >
> > to make your case.
> >

Re: [Expectperl-discuss] help!!

[Adrian P. <ad...@po...>]

>>>>> "Roland" == Roland Giersig <RGi...@cp...> writes:

    Roland> well, this is a linux kernel problem, somebody decided
    Roland> that ptys need not handle lines longer than 155 bytes at a
    Roland> time, so there. I'm just the messenger, talk to redhat

Which Linux kernel ? In 2.4.20 :-

./include/linux/tty.h:153:#define PTY_BUF_SIZE	4*TTY_FLIPBUF_SIZE
./include/linux/tty.h:137:#define TTY_FLIPBUF_SIZE 512

Which means 2048 not 155. Is the limit some other place, libc or is
yet another Redhat x.0 screw up ?

On my machine, 2.4.20 glibc 3.2.1 it is definitely 2048 as I have a
perl module based upon Expect where each read and write of a big
transfer through the pty receives/sends 2048.

Sincerely,

Adrian Phillips

-- 
Who really wrote the works of William Shakespeare ?
http://www.pbs.org/wgbh/pages/frontline/shakespeare/