when ngx_array_t allocate a new array, why not ngx_pfree pre a->elts?

[l.jay Yuan]

Game clients's connection is not transient.

2012/5/23 l.jay Yuan <pass86 at gmail.com>:
> Thank you very much.So the design is specially for the web request.I
> were going to learn the source and use for MMORPG game server.Game
> clients's connection is transient.I want to improve the code.
>
> 2012/5/22 Vladimir Shebordaev <vshebordaev at mail.ru>:
>> Hi!
>>
>> 2012/5/22 l.jay Yuan <pass86 at gmail.com>:
>>> when ngx_array_t allocate a new array, why not ngx_pfree pre a->elts?
>>>
>>
>> Well, it seems to be a generic design decision. If you allocate a
>> dynamic object from the pool, you do it for speed, so, it is the most
>> likely relevant to the current request processing and supposed to be
>> destroyed right after that. It is done all at once when you
>> explicitely destroy the pool, either the objects  are allocated from
>> one of the server pools that only persist during the current request
>> processing.  Since there is no need in partial memory reclamaition, it
>> is faster to just allocate the memory anew.
>>
>>> btw: ngx_pfree only free large memory, so I can not use ngx_pool_t everywhere...
>>>
>>
>> If you do need the objects that would persist through different
>> request processing and the server reloading, you might want to use
>> ngx_slab_pool_t on some shared memory region. As far as I can recall
>> at the moment, nginx slab allocator provides necessary reclamaition
>> facilities.
>>
>> --
>> Regards,
>> Vladimir
>>
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