Re: Vacuum analyse after a long time without one ...

For a 64 bit machine..does the higher shared buffer setting really
offer a significant improvement over a 32 bit lower setting coupled
with linux caching ? Is the postgres shared buffer algorithm superior
to the linux caching algorithm to favor a switch to 64 bit



On Fri, Sep 11, 2009 at 9:50 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Nicolas Michel <nicolas.michel@lemail.be> writes:
>> - I have 16Go of RAM on that server (but 32bits OS with bigmem kernel ;
>> so I set shared buffer to 350000 (~2,7GB) for a shmmax of 4000000000
>> (~3,8GB)
>
> On a 32-bit machine that's just insane.  You've got something like 300MB
> left over in the process address space (assuming the typical 1Gb for
> kernel split).  No wonder things are falling over.  Try putting
> shared_buffers somewhere around 1Gb.  Or switch to 64-bit.
>
>                        regards, tom lane
>
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