Andrew Belov wrote:
> On Sat, 20 Mar 2004 14:43:52 -0800 (PST), Gerry Britton wrote:
> 
> 
>>>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.
> 
> 
> It doesn't look this way.
> 
> SWAPPER  DAT  1048576  20.03.04  21:42
> 
> Shouldn't that be easier to discard the code segments and reload them
> from the DLLs when necessary, rather than duplicating their code in the
> swapper file?

Yes, no. As in the old days as RAM was very expensive nobody has buyed 
enough to avoid swapping even in standard use there was the problem 
that in extreme requirements even system dlls had to swap out.
There is the problem: reading code from DLL needs readdressing 
anything again whereas the swapper is an real extension of RAM. This 
costs more time than to read simply something back - but uses more 
swapper space. So the memory manager check if the relation of RAM size 
fits to the average use of RAM an average system needs. If RAM 
available is less than that the system loader writes in the initial 
phase some system DLLs after loading magically directly to swapper to 
reserve the space before anything else goes on. Makes it quicker to 
load them when discarding was required and they reload from its DLLs.

As this itself is even an time consuming process it was a compromise 
between loadup time and usage time. You sees this behavior again when 
you shrinks your memory to only 32 MB.

Your startsize is quite much too big when you have 128 MB or more RAM.
2048 is good enough and will normally never grow the swapper.

But you should increas the warning time significantly. set this to 
64MB or better higher - because this is on modern processors the only 
chance to get be warned and a chance to kill one or more memory hungry 
processes until there is no more room to swap out. The standard size 
of 2048 was good for a slow 80486. As the memory manager initiates the 
message but does not wait until it occures on the screen the swapper 
will eat any available space on disk before the system finds time to 
ask you if and which process you like to kill to avoid an system halt 
on lack of available virtual address space. While the message is 
sheduled to come on the screen the free space on disk shrinks 
continuousely - and at least much quicker now.



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