[slime-devel] Faster output

[Helmut Eller]

Luke Gorrie <luke at bluetail.com> writes:

> Where does the speed come from?

Don't know exactly. The event-logging is quite expensive, but things
are still slow without logging.  Below are some numbers for this
program:

 (defun output-test1 ()
   (time (loop for i from 0 to 200000 do (progn (print i) (force-output))))) 

For an xterm, a single channel variant without logging, with logging, and
the new scheme with a second channel.   I deleted the repl and events
buffers before running the benchmark and the repl window was never visible.
Everything in Emacs20.

xterm
;   14.14 seconds of real time
;   1.98 seconds of user run time
;   1.3 seconds of system run time

no logging single channel
;   41.67 seconds of real time
;   7.53 seconds of user run time
;   1.16 seconds of system run time

with logging single channel
;   184.34 seconds of real time
;   7.93 seconds of user run time
;   0.96 seconds of system run time

second channel.
;   6.52 seconds of real time
;   2.74 seconds of user run time
;   0.88 seconds of system run time