Subject: Re: [boost] [xpressive] Performance Tuning?
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2009-07-01 15:15:21
Dave Jenkins wrote:
> >> Each call to parse() is constructing the sregex variables.
> >> If you make them static or move them out of the loop, it
> >> should help a lot.
> > Thanks, but see my reply to Eric's. While that would help
> > with the benchmark performance, the nature of the function
> > I'm testing means I can't do that otherwise.
> How about making them static const? That should be thread safe.
I'm sorry, I read your original suggestion as being the same as Eric's: reuse the match_results. Unfortunately, the semantic actions reference local variables, so I don't think I can make the sregex's static (please correct me if I'm wrong, but I can't see how multiple parallel invocations of the function could reference separate stack variables from static sregex's). I did make the sregex's const; that appears to have improved performance a bit.
Rob Stewart robert.stewart_at_[hidden]
Software Engineer, Core Software using std::disclaimer;
Susquehanna International Group, LLP http://www.sig.com
IMPORTANT: The information contained in this email and/or its attachments is confidential. If you are not the intended recipient, please notify the sender immediately by reply and immediately delete this message and all its attachments. Any review, use, reproduction, disclosure or dissemination of this message or any attachment by an unintended recipient is strictly prohibited. Neither this message nor any attachment is intended as or should be construed as an offer, solicitation or recommendation to buy or sell any security or other financial instrument. Neither the sender, his or her employer nor any of their respective affiliates makes any warranties as to the completeness or accuracy of any of the information contained herein or that this message or any of its attachments is free of viruses.
Boost list run by bdawes at acm.org, gregod at cs.rpi.edu, cpdaniel at pacbell.net, john at johnmaddock.co.uk