ASU - out of memory?
tilman at baumann.name
Thu Aug 21 16:05:18 CEST 2008
Tilman Baumann wrote:
>> i'd think it would make little sense so make the system
>> that fragile. fix the memory usage issue - don't just "get more slow slow slow"
>> ram. :)
> As i said, i had made the experience that it improved the system
> greatly. Shouldn't we just test it?
> Perhaps, that is what i will try to do with my Neo1973 soon...
This is how swap was used after launching some apps simultaniously
(tangogps, navit, browser, mediaplayer) using them for some time and
then shut them down again:
total used free shared buffers cached
Mem: 126268 111008 15260 0 1304 68736
-/+ buffers/cache: 40968 85300
Swap: 64720 44 64676
These 44kbytes came only some minutes after swap was enabled and used.
And they came only in a few chunks.
44kbyte are not very impressive, but they prove my point never the less.
This memory is obviously waste. It stays in swap for ages. Not much
saved, but anyhow. It is memory that did not need to be in ram.
I would assume with more complex software like it is coming for
freerunners (enough ROM for bloatware) this will sightly increase.
And regarding the point of wasting power with io on the swapfile.
Sure, i did not measure real io. But just looking at the output of free
via watch shows pretty clearly that swap is virtually not used in
Ergo, in case no emergency is present, swap is not used and no harm is
done. (Besides saving some kbyte of real RAM)
But IF memory becomes a problem, swap comes to rescue.
(Found no real world way to really excessively use mem and drive the
kernel into swapping in the short time. But the result seems pretty
obvious to me. No crash but graceful performance breakdown)
Based on this quick survey, i would say there no way swap could bring
any danger or adverse effects.
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