[Development] Proposal for "container-oriented deterministic memory manager"

[Phil Bouchard]

On 01/06/2017 08:05 PM, Phil Bouchard wrote:
> On 01/06/2017 07:17 PM, Phil Bouchard wrote:
>>
>> Just to conclude I did try the attached benchmark and I get the
>> following on a x86_64 @ 2.40 GHz:
>>
>> 0: 61331143.40263957 allocations / second
>> 1: 63644162.93924019 allocations / second
>> 2: 177628727.5388474 allocations / second
>> 3: 179850939.5413082 allocations / second
>> 1 / 0: 103.7713621632905% boost
>> 2 / 1: 101.2510431354494% boost
>>
>> So the fast_pool_allocator is already pretty fast and I can only get a
>> 1% speed boost by allocating big memory blocks.  So it doesn't look like
>> there is any way to make the fast_pool_allocator any faster.
>
> Correction: I get a 11% speed boost with the -O3 flag:
>
> 0: 60387275.67636769 allocations / second
> 1: 63133704.55951615 allocations / second
> 2: 169169529.8609596 allocations / second
> 3: 188535531.4062488 allocations / second
> 1 / 0: 104.5480258090584% boost
> 2 / 1: 111.447688931456% boost
>
> So I am not sure if this is worth the trouble.

Did you know the optimized boost::fast_pool_allocator is 305% times 
faster than the regular one?

0: 61407861.18875794 allocations / second
1: 62565419.96725326 allocations / second
2: 175311265.1512761 allocations / second
3: 187319938.708916 allocations / second
1 / 0: 101.8850335381934% boost
2 / 1: 106.8499155187076% boost
3 / 0: 305.0422781101666% boost

Is Qt using a similar pool allocator?
-------------- next part --------------
A non-text attachment was scrubbed...
Name: pool-benchmark.cpp
Type: text/x-c++src
Size: 1645 bytes
Desc: not available
URL: <http://lists.qt-project.org/pipermail/development/attachments/20170106/c1679bd2/attachment.cpp>