[boost] [smart_ptr] make_shared performance

Subject: [boost] [smart_ptr] make_shared performance
From: Frank Mori Hess (frank.hess_at_[hidden])
Date: 2009-01-16 16:40:43

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I've been doing a little benchmarking (trivial benchmark program attached) of 
boost::make_shared performance.  With svn trunk, I don't see much improvement 
from using make_shared, in fact for large objects it is much slower.  I would 
guess this is due to the increased overhead of copying sp_ms_deleter for 
large types.  I wonder if anyone has any ideas for improving the situation?
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        filename="make_shared_benchmark.cpp"

#include <boost/make_shared.hpp>
#include <boost/shared_ptr.hpp>

struct X
{
  int x[1000];
};

int main()
{
  static const unsigned num_iterations = 10000000;
  for(unsigned i = 0; i < num_iterations; ++i)
  {
//      boost::shared_ptr<X> p(new X);
     boost::shared_ptr<X> p = boost::make_shared<X>();
  }
}

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