Intel Xeon CPU L5310 @ 1.60GHzLinux, gcc 3.4.6, -O3 $ date
Thu Jul 5 16:57:59 UTC 2007
$./speedtest_numtoa
type sprintf snprf numtoa improvement
unsigned 8 200000 210000 20000 10.5x
unsigned 16 220000 230000 40000 5.8x
unsigned 32 220000 230000 50000 4.6x
signed 8 200000 210000 20000 10.5x
signed 16 230000 220000 50000 4.4x
signed 32 220000 220000 60000 3.7x
type %e %f %g dtoa improvement
double 1610000 2280000 1590000 120000 13.2x
AMD 2.2G Dual Core Operton Processor 275With gcc 3.4.4, -O3 $ date
Tue Apr 10 02:10:26 UTC 2007
$ ./speedtest_numtoa
type sprintf snprf numtoa improvement
unsigned 8 200000 210000 10000 21.0x
unsigned 16 190000 190000 30000 6.3x
unsigned 32 160000 190000 30000 6.3x
signed 8 190000 210000 20000 10.5x
signed 16 180000 210000 30000 7.0x
signed 32 170000 190000 40000 4.8x
double 1670000 1590000 110000 14.5xIntel 2.2 Ghz Core 2 DuoI forgot what machine this was. I think it was MacBookPro, running 10.4.X With gcc 4.0.1, -O3 ~/stringencoders-v3.1.0 nickg$ date
Fri May 11 17:23:04 EDT 2007
~/stringencoders-v3.1.0 nickg$ ./speedtest_numtoa
type sprintf snprf numtoa improvement
unsigned 8 19 18 2 9.0x
unsigned 16 20 19 3 6.3x
unsigned 32 19 19 3 6.3x
signed 8 18 20 1 20.0x
signed 16 20 21 2 10.5x
signed 32 19 20 3 6.7x
type %e %f %g dtoa impro
double 54 61 43 13 3.3xIntel 2.2 Ghz Core 2 Duo, Mac OS X 10.5New MacBook, Running Mac OS X 10.5.1. I believe this has a different motherboard than the version before. $ date
Thu Dec 6 09:50:17 EST 2007
./speedtest_numtoa
type sprintf snprf numtoa improvement
unsigned 8 193380 183893 15041 12.2x
unsigned 16 204912 203507 23012 8.8x
unsigned 32 206285 202143 26785 7.5x
signed 8 187765 189751 16240 11.7x
signed 16 214287 209203 26885 7.8x
signed 32 201955 205160 32701 6.3x
type %e %f %g dtoa improvement
double 541438 593712 434464 84678 5.1x
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