Re: [Firebird-devel] FB 2.1 64bit and memory usage ??

[Tom M. <mad...@gm...>]

Dmitry Yemanov wrote:
> Leyne, Sean wrote:
>   
>> How was the cache 128K page limit arrived at?
>>     
>
> IIRC, it always existed (at least since IB6). Originally it was 64K 
> pages and the limit has been increased to 128K pages in v2.0.
>
>   
>> Could the limit be increased to 256K and beyond; for 32Bit?
>>     
>
> Yes, it could. The question is who will be responsible for the too large 
> values (> 2GB in total). Should we adjust the specified size to some 
> hardcoded limit before allocating memory or rely on the OS kernel and 
> allocate as much as allowed (and perhaps write to firebird.log that we 
> couldn't do better).
>   
That would be my vote.

>   
>> Is there a point at which the performance of new cache logic might
>> degrade?
>>
>> (If we allowed the cache to be 1M pages; would that result in degraded
>> performance?)
>>     
>
> It's definitely worth measuring before committing the patch into CVS.
>
>
> Dmitry
>
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