gawk i=16 join
131071

real	0m0.056s
user	0m0.052s
sys	0m0.003s

gawk i=16 xjoin
131071

real	0m0.115s
user	0m0.101s
sys	0m0.013s

gawk i=18 join
524287

real	0m0.225s
user	0m0.198s
sys	0m0.027s

gawk i=18 xjoin
524287

real	0m0.382s
user	0m0.334s
sys	0m0.046s

gawk i=20 join
2097151

real	0m0.650s
user	0m0.572s
sys	0m0.076s

gawk i=20 xjoin
2097151

real	0m1.276s
user	0m1.175s
sys	0m0.096s

gawk i=22 join
8388607

real	0m2.648s
user	0m2.268s
sys	0m0.372s

gawk i=22 xjoin
8388607

real	0m5.156s
user	0m4.750s
sys	0m0.392s

dawk i=16 join
131071

real	0m0.021s
user	0m0.014s
sys	0m0.007s

dawk i=16 xjoin
131071

real	0m0.039s
user	0m0.033s
sys	0m0.007s

dawk i=18 join
524287

real	0m0.058s
user	0m0.051s
sys	0m0.007s

dawk i=18 xjoin
524287

real	0m0.127s
user	0m0.110s
sys	0m0.017s

dawk i=20 join
2097151

real	0m0.198s
user	0m0.188s
sys	0m0.010s

dawk i=20 xjoin
2097151

real	0m0.464s
user	0m0.429s
sys	0m0.033s

dawk i=22 join
8388607

real	0m0.780s
user	0m0.740s
sys	0m0.037s

dawk i=22 xjoin
8388607

real	0m1.874s
user	0m1.773s
sys	0m0.097s