Re: [boost] [xpressive] Performance Tuning?

Subject: Re: [boost] [xpressive] Performance Tuning?
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2009-07-28 08:44:25

OvermindDL1 wrote:
> >
> Okay, I basically just copy/pasted my thread-safe version of my spirit
> parser over and ran it, it returned bad parse with like 13/9 or
> something like that.  According to the documentation in the original
> cpp file, only "1", "1 2/3", or "1.2" are valid, not "2/3", so I

>From the beginning, I specified real numbers, whole numbers, mixed numbers, and fractions.

> changed it to support that and ran it again, it parsed successfully
> with all numbers in your tests matching successfully.  Here is what it

Excellent.

> printed, using the horribly inaccurate time function:
> Testing string-based parsing
> Testing Xpressive-based parsing
> Testing Spirit-based parsing
> string parsing: 8s
> xpressive parsing: 33s
> spirit parsing: 6s

That's why I offered the iterations argument: increase by, say, 5 times and you'll have numbers you can compare a little more accurately.

> If you do not mind, I am going to add a millisecond accuracy testing
> framework (test.hpp from the boost examples) to the file and change
> all the nasty time calls to it for a more reliable reading.  I backed

I don't mind at all.  It is helpful to get better accuracy as the test needn't be run with as many iterations.

> For now, I have attached my modified main.cpp
> that includes the thread-safe spirit parser (I have not yet added the
> other two, do you want me to even bother?), and it includes the single

I don't know the difference among them, so I can't answer for including them or not.

> P.S.  I would be quite happy if anyone could get rid of that
> freakishly long double->int64_t cast warning in the xpressive code, I
> like clean builds.  :)

I don't get the warning, so you'll have to be more specific.

_____
Rob Stewart                           robert.stewart_at_[hidden]
Software Engineer, Core Software      using std::disclaimer;
Susquehanna International Group, LLP  http://www.sig.com

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