[Pool][singleton_pool] Performance problem or bad usage?
Hi, I've created a helper class called MemoryPooled to help add pooling to some of my classes; however, the performance seems slow by comparison to non-pooled behavior. My code is shown below, I suspect I'm doing something wrong but I don't see how it can be my class. Does anyone have any idea? -Jason // Begin code -------------------------------------- #include <Utilities/stopwatch.h> #include <boost/pool/singleton_pool.hpp> #include <boost/shared_ptr.hpp> #include <iostream> template<typename T> class MemoryPooled : public T { public: MemoryPooled(){} virtual ~MemoryPooled(){} static const int countObjectsInitiallyAllocated = 1000; typedef boost::singleton_pool<T, countObjectsInitiallyAllocated> Pool; void* operator new(size_t /*p_memSize*/) { return Pool::malloc(); } void operator delete(void* p_memBlock) { Pool::free(p_memBlock); } }; struct Test1 { int i0; int i1; int i2; int i3; int i4; int i5; int i6; int i7; int i8; int i9; }; void test(bool p_isPooled) { Utilities::StopWatch sw; // Stopwatch is my helper for getting times sw.start(); for(int i=0; i < 100000; ++i) { if( p_isPooled ) boost::shared_ptr<Test1> item(new MemoryPooled<Test1>()); else boost::shared_ptr<Test1> item(new Test1()); } const double elapsed = sw.elapsedTime(); cout << "Elapsed time: " << elapsed << " ms" << endl; } int main(int, char**) { test(true); test(false); } // End code -------------------------------------- Output: Elapsed time: 106.812 ms (Pooled) Elapsed time: 94.2158 ms (Not Pooled)
What kind of optimization did you use? I modified your code to use my timer, and here's the result " test(true) loops=100000 realtime=15393us systime=0us usrtime=10000us waittime=5393us avgRealtimePerLoop=0.15393us avgSystimePerLoop=0us avgUsrtimePerLoop=0.1us avgWaittimePerLoop=0.05393us test(false) loops=100000 realtime=20022us systime=0us usrtime=20000us waittime=22us avgRealtimePerLoop=0.20022us avgSystimePerLoop=0us avgUsrtimePerLoop=0.2us avgWaittimePerLoop=0.00022us " My compiler is icc 9.1.047, with O3 optimization flags -----Original Message----- From: boost-users-bounces@lists.boost.org on behalf of Aubrey, Jason Sent: Wed 4/18/2007 12:12 PM To: boost-users@lists.boost.org Subject: [Boost-users] [Pool][singleton_pool] Performance problem or badusage? Hi, I've created a helper class called MemoryPooled to help add pooling to some of my classes; however, the performance seems slow by comparison to non-pooled behavior. My code is shown below, I suspect I'm doing something wrong but I don't see how it can be my class. Does anyone have any idea? -Jason // Begin code -------------------------------------- #include <Utilities/stopwatch.h> #include <boost/pool/singleton_pool.hpp> #include <boost/shared_ptr.hpp> #include <iostream> template<typename T> class MemoryPooled : public T { public: MemoryPooled(){} virtual ~MemoryPooled(){} static const int countObjectsInitiallyAllocated = 1000; typedef boost::singleton_pool<T, countObjectsInitiallyAllocated> Pool; void* operator new(size_t /*p_memSize*/) { return Pool::malloc(); } void operator delete(void* p_memBlock) { Pool::free(p_memBlock); } }; struct Test1 { int i0; int i1; int i2; int i3; int i4; int i5; int i6; int i7; int i8; int i9; }; void test(bool p_isPooled) { Utilities::StopWatch sw; // Stopwatch is my helper for getting times sw.start(); for(int i=0; i < 100000; ++i) { if( p_isPooled ) boost::shared_ptr<Test1> item(new MemoryPooled<Test1>()); else boost::shared_ptr<Test1> item(new Test1()); } const double elapsed = sw.elapsedTime(); cout << "Elapsed time: " << elapsed << " ms" << endl; } int main(int, char**) { test(true); test(false); } // End code -------------------------------------- Output: Elapsed time: 106.812 ms (Pooled) Elapsed time: 94.2158 ms (Not Pooled)
You're suggestion was correct. My optimizations were disabled and performance was suffering. Thanks Peng! -----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Xu, Peng Sent: Wednesday, April 18, 2007 12:48 PM To: boost-users@lists.boost.org; boost-users@lists.boost.org Subject: Re: [Boost-users] [Pool][singleton_pool] Performance problem or badusage? What kind of optimization did you use? I modified your code to use my timer, and here's the result " test(true) loops=100000 realtime=15393us systime=0us usrtime=10000us waittime=5393us avgRealtimePerLoop=0.15393us avgSystimePerLoop=0us avgUsrtimePerLoop=0.1us avgWaittimePerLoop=0.05393us test(false) loops=100000 realtime=20022us systime=0us usrtime=20000us waittime=22us avgRealtimePerLoop=0.20022us avgSystimePerLoop=0us avgUsrtimePerLoop=0.2us avgWaittimePerLoop=0.00022us " My compiler is icc 9.1.047, with O3 optimization flags -----Original Message----- From: boost-users-bounces@lists.boost.org on behalf of Aubrey, Jason Sent: Wed 4/18/2007 12:12 PM To: boost-users@lists.boost.org Subject: [Boost-users] [Pool][singleton_pool] Performance problem or badusage? Hi, I've created a helper class called MemoryPooled to help add pooling to some of my classes; however, the performance seems slow by comparison to non-pooled behavior. My code is shown below, I suspect I'm doing something wrong but I don't see how it can be my class. Does anyone have any idea? -Jason // Begin code -------------------------------------- #include <Utilities/stopwatch.h> #include <boost/pool/singleton_pool.hpp> #include <boost/shared_ptr.hpp> #include <iostream> template<typename T> class MemoryPooled : public T { public: MemoryPooled(){} virtual ~MemoryPooled(){} static const int countObjectsInitiallyAllocated = 1000; typedef boost::singleton_pool<T, countObjectsInitiallyAllocated> Pool; void* operator new(size_t /*p_memSize*/) { return Pool::malloc(); } void operator delete(void* p_memBlock) { Pool::free(p_memBlock); } }; struct Test1 { int i0; int i1; int i2; int i3; int i4; int i5; int i6; int i7; int i8; int i9; }; void test(bool p_isPooled) { Utilities::StopWatch sw; // Stopwatch is my helper for getting times sw.start(); for(int i=0; i < 100000; ++i) { if( p_isPooled ) boost::shared_ptr<Test1> item(new MemoryPooled<Test1>()); else boost::shared_ptr<Test1> item(new Test1()); } const double elapsed = sw.elapsedTime(); cout << "Elapsed time: " << elapsed << " ms" << endl; } int main(int, char**) { test(true); test(false); } // End code -------------------------------------- Output: Elapsed time: 106.812 ms (Pooled) Elapsed time: 94.2158 ms (Not Pooled) _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
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Xu, Peng