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Subject: Re: [boost] [log] Boost.Log Formal Review
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2010-03-18 11:18:16

sam.gundry_at_[hidden] wrote:
> A concern, which again Andrey has mentioned during this
> review, is the speed of Boost.DateTime formatting. From our
> comparisons, it is about 3-5x slower than log4cxx. Is it
> possible to have a bare-minimum date time formatter similar
> to log4cxx's implemented? I wrote a quick little wrapper
> using a customised strftime (for microseconds) with the most
> basic caching (which log4cxx's formatter uses) and
> performance was comparable.

In our logging library, date/time formatting was likewise too sluggish. I now track midnight as a time_t, with the date string, and then compute the current time relative to midnight, do a little math, and the result is a very fast computation of the current time. Of course, I also have to determine if the current time is more than 24 hours since the cached midnight to detect when the cached values must be updated.

Rob Stewart robert.stewart_at_[hidden]
Software Engineer, Core Software using std::disclaimer;
Susquehanna International Group, LLP

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