Gerry Britton wrote:
> On Sat, 20 Mar 2004 14:07:46 -0800, andrew{at}cci-29palms.com 
> wrote:
> 
> 
>>>setting could probably be appled with little risk.
>>
>>OS/2 swaps some DLL's to the swapper.dat if it exists.  
> 
> 
> For sure, even if you have 2G's of RAM installed, the system will 
> copy the DLL;s to the swap.

No. When you have more than 64 MB RAM the swapper gets only written 
when an process needs more virtual address space than RAM is currently 
unused.

Only when you have really less than 64 MB RAM then the system starts
writing system dlls out into swapper to have more pages available for 
swapping out. With 64 or more MB of RAM there is no need to tune up 
because it is enough RAM to hold frequently (and even seldom used DLLs 
fully in memory. The technique you describes was a tuning in the times 
even 32 MB RAM was expensive, so most systems were running only with 
64 MB RAM or significantly less inserted - and this is increasing the 
need to swap significantly.

With 64MB or more there is absolutely no need to swap system dlls out. 
So its never done. Look at theseus. swapper lives untouched with this 
amout of memory or more until RAM is full - and then only user 
addressspace gets discarded or written out, whereas readonly pages are 
always discarded.

The memory manager is really complicated because it tries to save time 
whenever and however possible.


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