unique_ptr+.c++
--cut--
#include <iostream>
#include <memory> // для std::unique_ptr

#include "Item.h"

int main()
{
	for (int i = 0; i < 100000000; ) {
		std::unique_ptr<Item> item(new Item(i));
		i++;
	}
 
	return 0;
}
--cut--
================================================================================
unique_ptr-.c++
--cut--
#include <iostream>
#include <memory> // для std::unique_ptr

#include "Item.h"

int main()
{
	for (int i = 0; i < 100000000; ) {
		Item* item = new Item(i);
		i++;
		delete item;
	}
 
	return 0;
}
--cut--
================================================================================
Item.h
--cut--
#include <unistd.h>

class Item
{
public:
	Item(int i):i(i)
		{ write(STDOUT_FILENO, ">", 1); }
	~Item()
		{ write(STDOUT_FILENO, "<", 1); i--; }
private:
	int i;
};
--cut--
================================================================================
Makefile
--cut--
all: unique_ptr+ unique_ptr-

unique_ptr+: unique_ptr+.c++
	c++ $^ -o $@ -O3

unique_ptr-: unique_ptr-.c++
	c++ $^ -o $@ -O3
--cut--
================================================================================
================================================================================
================================================================================
два запуска "+"
$ sudo perf stat ./unique_ptr+ >/dev/null

 Performance counter stats for './unique_ptr+':

         17 986,22 msec task-clock                #    1,000 CPUs utilized
                60      context-switches          #    0,003 K/sec
                 0      cpu-migrations            #    0,000 K/sec
               122      page-faults               #    0,007 K/sec
    63 842 579 962      cycles                    #    3,550 GHz
   133 523 204 873      instructions              #    2,09  insn per cycle
    26 203 958 590      branches                  # 1456,891 M/sec
            72 456      branch-misses             #    0,00% of all branches

      17,987337609 seconds time elapsed

       5,579484000 seconds user
      12,406853000 seconds sys


$ sudo perf stat ./unique_ptr+ >/dev/null
 Performance counter stats for './unique_ptr+':

         17 917,53 msec task-clock                #    1,000 CPUs utilized
               124      context-switches          #    0,007 K/sec
                 2      cpu-migrations            #    0,000 K/sec
               122      page-faults               #    0,007 K/sec
    63 179 246 976      cycles                    #    3,526 GHz
   133 524 156 215      instructions              #    2,11  insn per cycle
    26 204 153 897      branches                  # 1462,487 M/sec
            86 269      branch-misses             #    0,00% of all branches

      17,920061593 seconds time elapsed

       5,931150000 seconds user
      11,986282000 seconds sys


================================================================================
================================================================================
================================================================================
два запуска "-"
$ sudo perf stat ./unique_ptr- >/dev/null
 Performance counter stats for './unique_ptr-':

         17 844,46 msec task-clock                #    1,000 CPUs utilized
                50      context-switches          #    0,003 K/sec
                 0      cpu-migrations            #    0,000 K/sec
               123      page-faults               #    0,007 K/sec
    63 310 787 822      cycles                    #    3,548 GHz
   133 523 339 391      instructions              #    2,11  insn per cycle
    26 203 981 684      branches                  # 1468,466 M/sec
            74 410      branch-misses             #    0,00% of all branches

      17,845494383 seconds time elapsed

       5,940188000 seconds user
      11,904377000 seconds sys


$ sudo perf stat ./unique_ptr- >/dev/null
 Performance counter stats for './unique_ptr-':

         18 921,22 msec task-clock                #    1,000 CPUs utilized
                57      context-switches          #    0,003 K/sec
                 1      cpu-migrations            #    0,000 K/sec
               123      page-faults               #    0,007 K/sec
    65 560 699 792      cycles                    #    3,465 GHz
   133 528 879 861      instructions              #    2,04  insn per cycle
    26 204 948 357      branches                  # 1384,950 M/sec
           151 713      branch-misses             #    0,00% of all branches

      18,922880390 seconds time elapsed

       6,348399000 seconds user
      12,572791000 seconds sys

================================================================================
все.