Re: C++ Memory Management Innovation: GC Allocator
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Re: C++ Memory Management Innovation: GC Allocator         

Group: comp.lang.c++.moderated · Group Profile
Author: xushiwei
Date: May 8, 2008 01:30

> Had a look at your code... Looks unnecessarily complicated to me. Here
> is the result of about 15 minutes of work:
>
> [code]
> #include
> #include
>
> using namespace std;
>
> struct FastAlloc
> {
> struct Block
> {
> unsigned char memory[1024];
> };
> deque m_pool;
> size_t m_left;
>
> FastAlloc() : m_left(0) {}
>
> void* allocate(size_t size)
> {
> assert(size <= 1024);
> if (size > m_left)
> {
> m_pool.resize(m_pool.size() + 1);
> m_left = 1024;
> }
>
> void* res = m_pool.back().memory + 1024 - m_left;
> m_left -= size;
> return res;
> }
>
> };

I toke a performance comparison of

* boost::memory::auto_alloc
* boost::memory::scoped_alloc (use tls_block_pool::instance)
* boost::memory::scoped_alloc
* boost::memory::gc_alloc (auto)
* boost::memory::gc_alloc (manually)
* boost::pool (auto)
* boost::object_pool (auto)
* new/delete (gcc)
* mt_allocator (gnu c++)

Here (auto) means recycling objects when allocators' destructor is
called. and (manually) means deleting objects manually.

TestCase: performance.cpp <http://tinyurl.com/65k728>
Output: output.txt <http://tinyurl.com/5rzg2c>
See: http://winx.googlecode.com/svn/tags/boost-memory-0.1.01/

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