[Bug c++/20162] New: new/delete performance versus std::allocator

["sylvain dot pion at sophia dot inria dot fr" <gcc-bugzilla at gcc dot gnu dot org>]

I do not understand why new/delete is slower than std::allocator.
Is there a fundamental reason why it is so ?

The benchmark program attached gives the following timing for series
of new/delete versus std::allocator allocations/deallocations.

                  new/delete   std::allocator
 g++ 3.3.2 -O3 :   2.45 s       1.56 s
 g++ 3.4.3 -O3 :   2.25 s       2.24 s
 g++ 4.0.0 -O3 :   2.13 s       1.30 s

-- 
           Summary: new/delete performance versus std::allocator
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: sylvain dot pion at sophia dot inria dot fr
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20162