Re: [PATCHES] [HACKERS] ARC Memory Usage analysis

Thomas F.O'Connell wrote:
> 
> As a result, I was intending to inflate the value of 
> effective_cache_size to closer to the amount of unused RAM on some of 
> the machines I admin (once I've verified that they all have a unified 
> buffer cache). Is that correct?
> 

Effective cache size is IMHO a "bogus" parameter on postgresql.conf,
this because:

1) That parameter is not intended to instruct postgres to use that ram but
    is only an hint to the engine on what the "DBA" *believe* the OS cache
    memory for postgres
2) This parameter change only the cost evaluation of plans ( and not soo
    much )

so don't hope to double this parameter and push postgres to use more RAM.



Regards
Gaetano Mendola