Re: gnuplot slow on BIG files

[Ethan M. <merritt@u.washington.edu>]

On Thursday 09 June 2005 09:12 am, Robert Hart wrote:
> 
> I have attached my test program. I can't find any input on my system
> that gives different results between sscanf and strtod.

Very nice. Thank you.
So strtod is faster on all platforms I have tried, with the largest
difference on DU/alpha and the smallest difference on SunOS.

Not the factor of 10X that Dimitrios Apostolou was hoping for,
but up to a factor of 5X depending on the platform.


linux/x86
---------
./scan_timing 100000 "3.5D 1E07"
Test atod: 0.059186
Test sscanf: 0.150265
Test strtod: 0.060353

DU/alpha
---------
./scan_timing 100000 "3.5D 1E07"
Test atod: 0.100689
Test sscanf: 0.588027
Test strtod: 0.124872

linux/AMD64
-----------
 ./scan_timing 100000 "3.5D 1E07"
Test atod: 0.033294
Test sscanf: 0.076438
Test strtod: 0.037122

irix/MIPS R4400
----------------
./scan_timing  100000 "3.5D 1E07"
Test atod: 0.352085
Test sscanf: 1.012914
Test strtod: 0.357065

SunOS 4.1.4 1 sun4m
---------------------------
./scan_timing 100000 "3.5D 1E07"
Test atod: 2.245737
Test sscanf: 4.014354
Test strtod: 2.706037


-- 
Ethan A Merritt       merritt@u.washington.edu
Biomolecular Structure Center
Mailstop 357742
University of Washington, Seattle, WA 98195