AMDG david.weber@l-3com.com wrote:
So, I'm investigating Object Pools, and I think I'm not getting something. The documentation isn't great, hence the question
We have a lot of small objects that we will use throughout our application's lifespan, and I'm trying to see if ObjectPool is a good fit for us. Heck, I'm just trying to look at performance of it in general.
So, I have the following code:
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void testNormal() { common::Timer t; t.start();
for(int i = 0; i < MAX_NUM_TESTS; i++) { testClass t; t.doWork(); } t.stop();
std::cout << "No Pool: Creating " << MAX_NUM_TESTS << " took " << str_cast(t.getTotalElapsedTime()) << std::endl; }
void testPool() { common::Timer t; t.start(); boost::object_pool<testClass> pool;
for(int i = 0; i < MAX_NUM_TESTS; i++) { testClass::ptr tc = pool.construct(); tc->doWork(); }
t.stop(); std::cout << "Pool: Creating " << MAX_NUM_TESTS << " took " << str_cast(t.getTotalElapsedTime()) << std::endl; }
int main(int argc, char* argv[]) { testNormal(); testPool();
return 0; } ------------------------------------------------
When run, I am getting:
No Pool: Creating 500000 took 00:00:00.187785 Pool: Creating 500000 took 00:00:00.281679
So, I guess I'm not understanding the advantage of the pools. Could someone write/modify my example to make it make more sense?
If you can use the stack as in testNormal, you shouldn't use Boost.Pool. If you want to test the speed of object_pool, you should compare it to heap allocation. void testNormal() { common::Timer t; t.start(); for(int i = 0; i < MAX_NUM_TESTS; i++) { std::auto_ptr<testClass> t(new testClass); t->doWork(); } t.stop(); std::cout << "No Pool: Creating " << MAX_NUM_TESTS << " took " << str_cast(t.getTotalElapsedTime()) << std::endl; } In Christ, Steven Watanabe