Re: [Boost-users] fast_pool_allocator question

Subject: Re: [Boost-users] fast_pool_allocator question
From: Brad Howes (bradley.howes_at_[hidden])
Date: 2011-06-14 10:41:02

On Jun 14, 2011, at 1:17 PM, steviekm3 wrote:

> I was wondering if fast_pool_allocator will speed something up.  
> 
> I have a funtion say g which looks like:
> 
> void g( Params p )
> {
>    std::map<double,Foo> m;
>    for( int i = 0; i < 100000; ++it )
>    {
>         m.insert( ... )
>    }
> }
> 
> g gets called from about 100 different threads running on 16 processor
> machine.  All the processors are not being used near full capacity.   I did
> some analysis and find that most of the time one thread is in malloc system
> call and other threads are blocking on it.  ( I guess malloc only allows
> serial access a certain points ).   
> 
> Would a fast_pool_allocator speed this up.  Could I pre-allocate the memory
> needed using a fast_pool_allocator ?   I don't want the pool to return
> memory to the system.  Just to reuse memory that is no longer needed ( reuse
> memory that m has used after m goes out of scope ).

I had great success using pool allocators. But you would definitely win if you could have a pool / thread rather than a shared pool.

Brad

-- 
Brad Howes
Calling Team - Skype Prague
Skype: br.howes