[naviserver-devel] Performance comparison of base64 encoders

[Gustaf N. <ne...@wu...>]

Dear friends,

Maybe, someone finds this information useful:

just now, i did a quick comparison of the various
options for base64 codecs. It shows that NaviServer's
built-in ns_base64encode  is very fast:
it is up to a factor of 1.000 faster than the Tcl-only
version of base64::encode, and even a factor of 10
faster than base64::encode based on Trf (Trf 2.1.4).
While a big difference relative to the plain Tcl version
is expected, the improvement over the C-based Trf
is remarkable.

The results are measured with the latest version of
NaviServer from bitbucket under Mac OS X 10.9.5

Using ns_base64encode reduces the external
dependencies and is by far the fastest version.

all the best
-g



size=100
		tcllib:	      134.713824 microseconds
		tcllib+trf:     4.561536 microseconds
		ns:		0.541651 microseconds

size=1000
		tcllib:	     1281.819696 microseconds
		tcllib+trf:    16.93683  microseconds
		ns:		1.517516 microseconds
			
size=10000
		tcllib:	    12638.85578 microseconds
		tcllib+trf:   143.11120 microseconds		
		ns:	       11.08016 microseconds

size=100000
		tcllib:	   127344.794553 microseconds
		tcllib+trf:  1423.021879 microseconds
		ns:	      113.504248 microseconds

------

foreach i {10 100 1000 10000} {
    set s [string repeat 0123456789 $i]
    lappend _ size=[string length $s]
    lappend _ tcllib:[time {base64::encode $s} 1000]
    lappend _ ns:[time {ns_base64encode $s} 1000]
}
join $_ \n