[mrtg] Re: Solaris Related Problems Off topic post - sorry

Chris Bell cbell at nympho.junknet.com
Wed Jul 28 19:04:07 MEST 1999

> Hi this is an off topic post, sorry but I have no idea where else to ask.
> I'm successfully using MRTG and the UCD snmp libs  monitor disk space,
> processor usage and free real and virtual memory on a solaris 2.6 system.
> MRTG works great - thanks Tobias for a great little tool.
> It's what mrtg shows up that has me worried, the real memory free very
> quickly falls from near 500Mb (the box has 512Mb in it) to just about 7 - 8
> Mb.  If I run top on the system and sort everything by size rather than cpu,
> I can count up all the memory that the various processess are using, guess
> what it doesn't add up to anywhere near 500Mb, more like a 100 or so.
> So my question(s) is(are) where has my memory gone and should I be worried?
> Does anyone else monitor similar stats with a sun and notice similar
> results?  Does anyone have any pointers for mailing lists / web sites /
> usenet groups etc. that might be able to advise?

Solaris (and most unix OS's) try to keep only about 1% memory free.
The rest is used up with disk IO cache.  These pages can be freed up
easily if processess need more space.

> I should point out that having seen the graphs and not believed them I
> wondered if the UCD libs were giving me bum data, I ran top at intervals
> over the 30 minute period or so following a reboot, and top also shows this
> steady decrease in the amount of free real memory available.


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