Edward Grace wrote:
This is somewhat cheating. We've tuned the numeric parsers of Spirit with TMP tricks, loop unrolling, etc. Those are very finely tuned numeric parsers you see there that beats the fastest C code such as strtol and atoi. The following benchmarks reveal 2X+ speed against low level strtol and atoi (attached). I am getting:
atoi: 0.82528 [s] strtol: 0.792227 [s] int_: 0.358016 [s]
The first and second are the low-level C routines. The third is Spirit's int_ parser. I need not mention that the C routines only accept C strings while the Spirit int_ parser can accept any forward iterator. So, in a sense, we're comparing apples and oranges. But this goes to show that you can write highly optimized code in generic C++.
Dear Joel,
Would you mind trying out these examples with my timer? I'd like to see if it gives sensible answers for other people's code on other people's machines. Attached is a reworking of your testbed code using my timer which can be obtained from boost vault,
Hi Edward, I tried a quick shot at it. There are compilation errors indeed. Please try to fix the errors first (*). You can get Spirit by getting the Boost trunk off SVN. (*) Also, please make sure you try it on Windows too. E.g. <sys/time.h> is non-standard, AFAIK. My main compiler is VC9. Your library is intended to be cross platform, right? Regards, -- Joel de Guzman http://www.boostpro.com http://spirit.sf.net