数値をカンマ区切りにするベンチマーク
需要ないと思いますが、perlで数値を３桁毎にカンマ区切りフォーマットに変換する
正規表現のベンチマークです。*1
スクリプト
#!/usr/bin/perl use strict; use warnings; use Math::BigInt; use Benchmark qw(timethese cmpthese); my $dbg = 0; my $count = 100000; my $comp = timethese( $count, { comma1_short => sub {comma1(1234);}, comma2_short => sub {comma2(1234);}, comma3_short => sub {comma3(1234);}, comma4_short => sub {comma4(1234);}, comma5_short => sub {comma5(1234);}, comma1_long => sub {comma1(1234567890123456789);}, comma2_long => sub {comma2(1234567890123456789);}, comma3_long => sub {comma3(1234567890123456789);}, comma4_long => sub {comma4(1234567890123456789);}, comma5_long => sub {comma5(1234567890123456789);}, } ); cmpthese $comp; # http://www.din.or.jp/~ohzaki/perl.htm#NumberWithComma # sub comma1 { my $price = shift; 1 while $price =~ s/^([-+]?\d+)(\d\d\d)/$1,$2/; print "1:$price\n" if $dbg; } sub comma2 { my $price = shift; $price =~ s/(\d{1,3})(?=(?:\d\d\d)+(?!\d))/$1,/g; print "2:$price\n" if $dbg; } sub comma3 { my $price = shift; $price =~ s/\G((?:^[-+])?\d{1,3})(?=(?:\d\d\d)+(?!\d))/$1,/g; print "3:$price\n" if $dbg; } sub comma4 { my $price = shift; $price = reverse(join(',', reverse($price) =~ /((?:^\d+\.)?\d{1,3}[-+]?)/g)) if $price =~ /^[-+]?\d\d\d\d/; print "4:$price\n" if $dbg; } sub comma5 { my $price = shift; my ($i,$j); if ($price =~ /^[-+]?\d\d\d\d+/g) { for ($i = pos($price) - 3, $j = $price =~ /^[-+]/; $i > $j; $i -= 3) { substr($price, $i, 0) = ','; } } print "5:$price\n" if $dbg; }
結果
Benchmark: timing 100000 iterations of comma1_long, comma1_short, comma2_long, comma2_short, comma3_long, comma3_short, comma4_long, comma4_short, comma5_long, comma5_short...
comma1_long: 2 wallclock secs ( 2.12 usr + 0.00 sys = 2.12 CPU) @ 47169.81/s (n=100000)
comma1_short: 0 wallclock secs ( 0.49 usr + 0.00 sys = 0.49 CPU) @ 204081.63/s (n=100000)
comma2_long: 0 wallclock secs ( 1.34 usr + 0.01 sys = 1.35 CPU) @ 74074.07/s (n=100000)
comma2_short: 1 wallclock secs ( 0.58 usr + 0.00 sys = 0.58 CPU) @ 172413.79/s (n=100000)
comma3_long: 1 wallclock secs ( 1.31 usr + 0.00 sys = 1.31 CPU) @ 76335.88/s (n=100000)
comma3_short: 1 wallclock secs ( 0.53 usr + 0.01 sys = 0.54 CPU) @ 185185.19/s (n=100000)
comma4_long: 0 wallclock secs ( 0.81 usr + 0.00 sys = 0.81 CPU) @ 123456.79/s (n=100000)
comma4_short: 1 wallclock secs ( 0.37 usr + 0.00 sys = 0.37 CPU) @ 270270.27/s (n=100000)
(warning: too few iterations for a reliable count)
comma5_long: 1 wallclock secs ( 0.72 usr + 0.00 sys = 0.72 CPU) @ 138888.89/s (n=100000)
comma5_short: 0 wallclock secs ( 0.43 usr + 0.00 sys = 0.43 CPU) @ 232558.14/s (n=100000)
Rate comma1_long comma2_long comma3_long comma4_long comma5_long comma2_short comma3_short comma1_short comma5_short comma4_short
comma1_long 47170/s -- -36% -38% -62% -66% -73% -75% -77% -80% -83%
comma2_long 74074/s 57% -- -3% -40% -47% -57% -60% -64% -68% -73%
comma3_long 76336/s 62% 3% -- -38% -45% -56% -59% -63% -67% -72%
comma4_long 123457/s 162% 67% 62% -- -11% -28% -33% -40% -47% -54%
comma5_long 138889/s 194% 87% 82% 12% -- -19% -25% -32% -40% -49%
comma2_short 172414/s 266% 133% 126% 40% 24% -- -7% -16% -26% -36%
comma3_short 185185/s 293% 150% 143% 50% 33% 7% -- -9% -20% -31%
comma1_short 204082/s 333% 176% 167% 65% 47% 18% 10% -- -12% -24%
comma5_short 232558/s 393% 214% 205% 88% 67% 35% 26% 14% -- -14%
comma4_short 270270/s 473% 265% 254% 119% 95% 57% 46% 32% 16% --
