Re: W32 to AIX performance

[Michael Mauger]

--- "Kim F. Storm" wrote:

> Michael Mauger writes:
> 
> > I'm currently using GNU Emacs 22.0.50.1 (i386-mingw-nt5.1.2600) of 
> > 2006-05-02 
> > on XP.  
> >
> > I use an up-to-date cygwin ssh to connect to both Solaris and AIX machines 
> > without problems using RSA keys.  Under the DOS console and cygwin's RXVT 
> > it 
> > works as expected.
> >
> > Starting an `M-x shell' and then invoking ssh within the comint buffer to a 
> > Solaris machine works great.  Tramp using the sshx method to the Solaris 
> > box 
> > works as well.
> >
> > Doing the same with the AIX box however is problematic.  Under comint, the 
> > response is so slow that it is unusable.  For example, more than a minute 
> > to 
> > `ls' an empty directory and get the next prompt.  The output does not come 
> > slowly, but rather all appears at the end of a long wait.  
> 
> Does setting process-adaptive-read-buffering to nil help?
> 

Nope.  Same behavior

> >                                                            Tramp using sshx 
> > is 
> > unusable because it times out.  In fact, under Emacs, any interaction with 
> > the 
> > AIX box exhibits this behavior.  
> 
> Is Emacs non-responsive when this happens, or using a lot of CPU?
> 

No, Emacs is still responsive; cursor is blinking, no CPU usage.

> Can you use a debugger to see what emacs is doing when it is waiting for
> output from the AIX box?
> 
> You may have to interrupt the execution several times and make a backtrace
> to see if there is a specific point where emacs is stuck.
> 

I'm building a debug version now.  I'll report my findings once I can test.