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As frawk development has stalled for the moment, you might have some time to investigate the relative slowness of getline when reading from a pipe (eg. "cat - " | or a redirected file (e.g < "/dev/stdin").
Also zawk is slower than frawk (but this might be due the fact that I didn't manage to build it with unstable feature yet.
# Read and print all input lines.
$ time yes | head -n 100000000 | mawk '{ print $0 }' > /dev/null
real 0m4.562s
user 0m4.472s
sys 0m0.300s
$ time yes | head -n 100000000 | frawk '{ print $0 }' > /dev/null
real 0m8.485s
user 0m8.544s
sys 0m0.292s
$ time yes | head -n 100000000 | /software/zawk/target/release/zawk '{ print $0 }' > /dev/null
real 0m13.969s
user 0m14.031s
sys 0m0.291s
$ time yes | head -n 100000000 | mawk 'BEGIN { while ( (getline ) > 0 ) { print $0 } }' > /dev/null
real 0m7.293s
user 0m7.143s
sys 0m0.309s
$ time yes | head -n 100000000 | frawk 'BEGIN { while ( (getline ) > 0 ) { print $0 } }' > /dev/null
real 0m7.279s
user 0m7.351s
sys 0m0.288s
$ time yes | head -n 100000000 | /software/zawk/target/release/zawk 'BEGIN { while ( (getline ) > 0 ) { print $0 } }' > /dev/null
real 0m11.796s
user 0m11.818s
sys 0m0.311s
# Count number of input lines:
$ time yes | head -n 100000000 | mawk 'END { print NR }'
100000000
real 0m2.245s
user 0m2.141s
sys 0m0.276s
$ time yes | head -n 100000000 | frawk 'END { print NR }'
100000000
real 0m3.905s
user 0m3.963s
sys 0m0.272s
$ time yes | head -n 100000000 | /software/zawk/target/release/zawk 'END { print NR }'
100000000
real 0m6.300s
user 0m6.328s
sys 0m0.295s
$ time yes | head -n 100000000 | mawk 'BEGIN { while ( (getline ) > 0 ) { line_count += 1;} print line_count}'
100000000
real 0m5.724s
user 0m5.619s
sys 0m0.290s
$ time yes | head -n 100000000 | frawk 'BEGIN { while ( (getline ) > 0 ) { line_count += 1;} print line_count}'
100000000
real 0m2.628s
user 0m2.686s
sys 0m0.267s
$ time yes | head -n 100000000 | /software/zawk/target/release/zawk 'BEGIN { while ( (getline ) > 0 ) { line_count += 1;} print line_count}'
100000000
real 0m4.128s
user 0m4.186s
sys 0m0.265s
$ time yes | head -n 100000000 | mawk 'BEGIN { while ( (getline < "/dev/stdin") > 0 ) { line_count += 1;} print line_count}'
100000000
real 0m6.523s
user 0m6.440s
sys 0m0.265s
$ time yes | head -n 100000000 | frawk 'BEGIN { while ( (getline < "/dev/stdin") > 0 ) { line_count += 1;} print line_count}'
100000000
real 0m20.624s
user 0m20.635s
sys 0m0.300s
$ time yes | head -n 100000000 | /software/zawk/target/release/zawk 'BEGIN { while ( (getline < "/dev/stdin") > 0 ) { line_count += 1;} print line_count}'
100000000
real 0m29.226s
user 0m29.207s
sys 0m0.300s
$ time yes | head -n 100000000 | mawk 'BEGIN { while ( ("cat -" | getline) > 0 ) { line_count += 1;} print line_count}'
100000000
real 0m6.426s
user 0m6.367s
sys 0m0.384s
$ time yes | head -n 100000000 | frawk 'BEGIN { while ( ("cat -" | getline) > 0 ) { line_count += 1;} print line_count}'
100000000
real 0m20.072s
user 0m20.063s
sys 0m0.369s
$ time yes | head -n 100000000 | /software/zawk/target/release/zawk 'BEGIN { while ( ("cat -" | getline) > 0 ) { line_count += 1;} print line_count}'
100000000
real 0m28.472s
user 0m28.406s
sys 0m0.416s
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