Result:

REEDFISH 8140.7MB (11.1%) SHAY 2275.4MB ( 3.1%) RJBS 1757.1MB ( 2.4%) ZDM 1688.2MB ( 2.3%) LSKATZ 1673.5MB ( 2.3%) AJPAGE 1218.4MB ( 1.7%) TIEDEMANN 1090.0MB ( 1.5%) KAL 957.1MB ( 1.3%) PERLANCAR 871.2MB ( 1.2%) XSAWYERX 804.0MB ( 1.1%) LDS 766.9MB ( 1.0%) BINGOS 722.1MB ( 1.0%) JKEGL 692.0MB ( 0.9%) DCANTRELL 677.9MB ( 0.9%) JESSE 625.6MB ( 0.9%) INA 625.0MB ( 0.9%) BTMCINNES 615.8MB ( 0.8%) DGINEV 575.2MB ( 0.8%) DROLSKY 518.8MB ( 0.7%) CHM 495.5MB ( 0.7%) PAWAPAWA 474.2MB ( 0.6%) AREIBENS 470.2MB ( 0.6%) GIBUS 459.5MB ( 0.6%) RKELSCH 449.1MB ( 0.6%) NWCLARK 435.4MB ( 0.6%) JDDPAUSE 435.2MB ( 0.6%) TMILLER 433.5MB ( 0.6%) STEVEB 425.5MB ( 0.6%) CJFIELDS 419.5MB ( 0.6%) SRI 407.6MB ( 0.6%) AMBS 396.3MB ( 0.5%) ADAMK 374.4MB ( 0.5%) EARONESTY 370.6MB ( 0.5%) JGNI 353.6MB ( 0.5%) MLEHMANN 351.6MB ( 0.5%) DANKOGAI 335.2MB ( 0.5%) NHORNE 332.9MB ( 0.5%) ABIGAIL 327.2MB ( 0.4%) OLIVER 310.9MB ( 0.4%) GRAHAMC 295.0MB ( 0.4%) ETHER 292.5MB ( 0.4%) MIYAGAWA 290.3MB ( 0.4%) HISSO 276.6MB ( 0.4%) KTHAKORE 267.4MB ( 0.4%) ASLEWIS 260.9MB ( 0.4%) TIMB 253.7MB ( 0.3%) VANSTYN 253.2MB ( 0.3%) RURBAN 252.7MB ( 0.3%) AGRUNDMA 242.5MB ( 0.3%) WOLFSAGE 238.7MB ( 0.3%)

Source:

http://backpan.cpantesters.org/backpan-full-index.txt.gz (~12MB as of this writing)

Total size of files on BackPAN:

% zcat backpan-full-index.txt.gz | perl -lnE'/.+ \d+ (\d+)$/ or next; $size+=$1; END { printf "%.1fMB

", $size/1024/1024 }' 73445.3MB

One-liner to generate the above result:

% zcat backpan-full-index.txt.gz | perl -lnE'm!authors/id/./../(\w+)/.+ (\d+) (\d+)$! or next; $size{$1}+=$3; END { printf "%9s %6.1fMB (%4.1f%%)

", $_, $size{$_}/1024/1024, $size{$_}/1024/1024/73445.3*100 for sort { $size{$b}<=>$size{$a} } keys %size }' | head -n50