[ loki-lib-Bugs-3598016 ] Smallobject benchmark in qtcreator, ubuntu, notebook

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Bugs item #3598016, was opened at 2012-12-20 22:42
Message generated for change (Settings changed) made by vaneyli
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Category: None
Group: None
Status: Open
Resolution: None
>Priority: 8
Private: No
Submitted By: vaneyli (vaneyli)
Assigned to: Nobody/Anonymous (nobody)
Summary: Smallobject benchmark in qtcreator,ubuntu,notebook 

Initial Comment:
output shows :
the speed of the smallobject is much slower than the default, also the boost!!! why?   please help me:)

I've downloaded. the newest code .  

//part of output


Allocator Benchmark Tests with 2 bytes big objects 

new      = global new/delete            sizeof(A) = 2
SmallObj = Loki::SmallObject            sizeof(B) = 8
ValueObj = Loki::SmallValueObject       sizeof(C) = 2
boost    = boost::object_pool           sizeof(D) = 2
allocator= std::allocator               sizeof(A) = 2
malloc   = std::malloc/free             sizeof(A) = 2


1000000 times 'delete new T'
new      :      seconds: 40     relative time: 100%     speed-up factor: 1
SmallObj :      seconds: 280    relative time: 700%     speed-up factor: 0.14
ValueObj :      seconds: 270    relative time: 675%     speed-up factor: 0.15
boost    :      seconds: 50     relative time: 125%     speed-up factor: 0.8
allocator:      seconds: 60     relative time: 150%     speed-up factor: 0.67
malloc   :      seconds: 40     relative time: 100%     speed-up factor: 1


N=3 :  1000000 times 'delete[] new T[N]'
new      :      seconds: 50     relative time: 100%     speed-up factor: 1
SmallObj :      seconds: 320    relative time: 640%     speed-up factor: 0.16
ValueObj :      seconds: 320    relative time: 640%     speed-up factor: 0.16
boost    :      seconds: 50     relative time: 100%     speed-up factor: 1
allocator:      seconds: 60     relative time: 120%     speed-up factor: 0.83
malloc   :      seconds: 40     relative time: 80%      speed-up factor: 1.25


i=0...1000000 :  1. 'arr[i] = new T'   2. 'delete arr[i]'
1. new      :   seconds: 40     relative time: 100%     speed-up factor: 1
2. new      :   seconds: 30     relative time: 100%     speed-up factor: 1

1. SmallObj :   seconds: 220    relative time: 550%     speed-up factor: 0.18
2. SmallObj :   seconds: 200    relative time: 667%     speed-up factor: 0.15

1. ValueObj :   seconds: 220    relative time: 550%     speed-up factor: 0.18
2. ValueObj :   seconds: 180    relative time: 600%     speed-up factor: 0.17

1. boost    :   seconds: 30     relative time: 75%      speed-up factor: 1.33
2. boost    :   boost::object_pool is not tested because it's too slow

1. allocator:   seconds: 40     relative time: 100%     speed-up factor: 1
2. allocator:   seconds: 20     relative time: 67%      speed-up factor: 1.5

1. malloc   :   seconds: 20     relative time: 50%      speed-up factor: 2
2. malloc   :   seconds: 20     relative time: 67%      speed-up factor: 1.5


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Comment By: vaneyli (vaneyli)
Date: 2012-12-29 01:58

Message:
 *Loki:
Version 0.1.7
January 2009
*ubuntu c++ complier: 
g++ 4.4.5

*other:
I'v found that the sgl stl v3.3 has adopted the same skill as the
smallobject in the loki.
But the stl in the c++ complier just use the default alloc.

answer:
the present malloc  or operator new has been optimized .          ????

help me:)

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