Re: [Boost-users] large variant performance compared (50 elements)

Subject: Re: [Boost-users] large variant performance compared (50 elements)
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2011-01-07 20:17:01

AMDG

On 1/7/2011 2:45 PM, Paul wrote:
> In a project we are using variants holding shared_ptr's. These 
> variants are typically 20 items large but are growing as the project 
> progresses. Now it seems that each time we add elements, we fall into 
> issue's regarding excessive compilation time, huge pdb file or out of 
> heap space errors on the compiler or linker.
>
> I took some time to compare various approaches using variants, here 
> are the results:

Looks like there's quadratic behavior.

Total instantiations: 45697
                                                                                            Location     count      cum.
-----------------------------------------------------------------------------------------------------------------------
                                                             
..\trunk\boost/variant/variant.hpp(666)      9604      9604
                                                             
..\trunk\boost/variant/variant.hpp(627)      9604     19208
                                              
..\trunk\boost/variant/detail/visitation_impl.hpp(163)      4949     24157
                                              
..\trunk\boost/variant/detail/visitation_impl.hpp(140)      4949     29106

In Christ,
Steven Watanabe