Randall R Schulz wrote:
> On Thursday 11 January 2007 19:04, Terry Eck wrote:
>   
>> ...
>>
>> I have always thought that the larger the real memory the smaller the
>> swap space required. There are exceptions of course. In general, if
>> your system uses a large swap space then you need to add more memory. 
>>     
>
> There's no fixed relationship and its never strictly necessary to have 
> any swap space at all. Rules of thumb are just that: rough, generic 
> guidelines that may be suitable for some non-negligible fraction of 
> installations, but which cannot possibly be optimum for all but a few 
> particular installations.
>
>   

That's true, there's no fixed relationship but there's a rule of thumb.
And rule of thumb is very usefull for almost everybody. Think of
partitioning during installation. You'll never know how much virtual
memory you need so you follow a rule of thumb. Then, you can tune it if
you really need it, right. But I don't think this is the case as the guy
posted here said he added swap just because he's added RAM.

Regards,
Jan


> The only thing you can say for sure is that whenever the system's 
> overall working set size exceeds the available RAM, you'll be thrashing 
> (if swap space is available at all). And if the total RAM required 
> exceeds available physical RAM plus swap, then the unlucky process that 
> tries to exceed that limit will simply not be able to get the RAM 
> allocation it requests. If it cannot explicitly handle that condition, 
> it will be terminated.
>
>
>   
>> Terry
>>     
>
>
> Randall Schulz
>   

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