Hi, On 14 August 2014 16:12, Philip Yarra <[email protected]> wrote:
> Hi all, > > hoping someone can answer a question I have about Solaris 10 and swap > usage. Clearly there's something I'm not quite getting. > > I started investigating because our app servers has 160GB of physical RAM. > However top reports that we have 83GB RAM free, but 38GB of swap in use. > That seems counter to my understanding of swap - a place to swap and page > process memory when physical RAM is exhausted. Since we're nowhere near > exhausting physical RAM, why would we be swapping? > > This post: > http://blog.logicmonitor.com/2014/08/12/why-youre-monitoring-solaris-virtual-memory-wrong/ > explains some of it for me - swap -l shows we're not really using swap, and > vmstat shows zero for si, so, pi and po. All good.. but can someone please > explain this statement for me? > > [Solaris] "... virtualizes the swap space, and includes unused parts of > physical memory as swap space". > > What am I missing here? Why would you use unused parts of physical RAM as > the space you use to swap out process memory to when RAM becomes full? > > See the description in the Solaris Internals book; hopefully this link will get you there: http://books.google.com.au/books?id=3Ys27a_I1tEC&pg=PT535&dq=solaris+virtual+swap+space&hl=en&sa=X&ei=SlXxU8K8ENKgogScxoDQCQ&ved=0CDoQ6AEwAw#v=onepage&q=solaris%20virtual%20swap%20space&f=false Gavin > Cheers, > Philip. > > > > _______________________________________________ > msosug mailing list > [email protected] > http://mexico.purplecow.org/m/listinfo/msosug > >
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