Re: [boost] [serialization] de-serialization performance issue

Subject: Re: [boost] [serialization] de-serialization performance issue
From: Robert Ramey (ramey_at_[hidden])
Date: 2011-01-20 01:34:31

Brad Higgins wrote:
> I have encountered a performance issue with serialization, when used
> with multi-index followed by a vector<size_t>.  I have a reduced
> program below, which reproduces the issue (using boost 1.44.0).
>
> I basically have a class with a multi-index member, and a
> vector<size_t> member.  It serializes OK, but deserialization's
> performance appears to be O(n^2).  It seems to be getting bogged down
> in basic_iarchive_impl::reset_object_address(), when deserializing
> the vector.  Any thoughts?

>        /**
>         * Boost serialization hook
>         */
>        friend class boost::serialization::access;
>        template<class Archive>
>            void serialize(Archive & ar, const unsigned int version)
>            {
>                std::cout << "SERIALIZE db_\n";
>                ar & boost::serialization::make_nvp("db", db_);
>                std::cout << "SERIALIZE vector_ints_\n";
>//                ar & boost::serialization::make_nvp("vector_ints",
>//            vector_ints_); //  <- THIS IS SLOW DURING INPUT }
                FOREACH(size_t x, vector_ints)
                    ar & x
> };
>
what happens if you make the change above?  That is, if you substitute 
you're
own loop for the boost::serialization implemenation?

Robert Ramey