Re: Any advantages to recompile Emacs...

[Peter Dyballa]

Am 10.12.2008 um 20:19 schrieb Francis Moreau:

> Do you mean that 'emacs -nw' with X support is slower to start than
> emacs without X support ?


Yes, every time you should be able to determine a few msec difference  
in launch time. The size of the binaries will vary, the number of  
shared libraries used and already residing in memory will vary – all  
the nsec and µsec saved will add ... every time!

This is from Apple's GNU Emacs without windowing support in Mac OS X  
10.4.11:

        time /usr/bin/emacs-21.2.1 -nw --no-init-file --no-site-file -kill
        
                Time spent in user mode   (CPU seconds) : 0.043s
                Time spent in kernel mode (CPU seconds) : 0.030s
                Total time                              : 0:00.11s
                CPU utilisation (percentage)            : 63.6%

My other self-compiled Emacsen (21.3.50, 22.1.50, 22.2, 22.3,  
23.0.50, 23.0.60) show something like this:

        time /sw/bin/emacs-21.3.50 -nw --no-init-file --no-site-file -kill
                Time spent in user mode   (CPU seconds) : 0.103s
                Time spent in kernel mode (CPU seconds) : 0.094s
                Total time                              : 0:00.30s
                CPU utilisation (percentage)            : 63.3%
        
or that:
        
        time /sw/bin/emacs-22.3 -nw --no-init-file --no-site-file -kill
        
                Time spent in user mode   (CPU seconds) : 0.175s
                Time spent in kernel mode (CPU seconds) : 0.076s
                Total time                              : 0:00.33s
                CPU utilisation (percentage)            : 72.7%
	time /usr/local/bin/emacs-23.0.60 -nw --no-init-file --no-site-file - 
kill
        
                Time spent in user mode   (CPU seconds) : 0.201s
                Time spent in kernel mode (CPU seconds) : 0.134s
                Total time                              : 0:00.50s
                CPU utilisation (percentage)            : 66.0%

All measurements after a few invocations if each variant. Each  
variant with windowing capabilities seems to initialise and restore  
the terminal emulation (some flashing/wiping effect). Could be GNU  
Emacs 19.28 is much much faster – at least in my memory and on my DEC  
VTxxx terminal at work ...

--
Greetings

  Pete

Well done is better than well said.
                                – Benjamin Franklin