Re: [boost] [review] The review of Boost.DoubleEnded starts today: September 21 - September 30

Subject: Re: [boost] [review] The review of Boost.DoubleEnded starts today: September 21 - September 30
From: Bjorn Reese (breese_at_[hidden])
Date: 2017-09-29 08:17:26

On 09/27/2017 11:06 PM, Ion Gaztañaga via Boost wrote:

> Usually the choice is usually between a factor of 2 and 1.5. The 
> theoretical limit value for the growth factor to be able to reuse 
> previously allocated memory is roughly 1.61. Howard Hinnant shared with 

There are several factors in play, so we may need a slightly more
sophisticated growth policy.

Besides memory coalescing, there is also the performance concern about
the average number of memory reallocation per added byte.

When the capacity is low we may want to grow more aggressively, because
the reallocation-per-byte concern outweighs the coalescing concern. As
the capacity increases the coalescing concern will become more important
and we would want to adjust the growth factor below the golden ratio.