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тАО08-14-2008 10:52 PM
тАО08-14-2008 10:52 PM
vmstat - "si" and "so" are 0 why ?
during installation of Oracle10gR2-32bit, vmstat output is attached.
I found that system gradually started using swap (swpd value: 0 then 36..40..44..48..140) but the value of swap-in "si" and swap-out "so" remain 0 .. why ? I think that once system starts using swap the si and so should be greater then 0 .. am I right ?
Regards
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тАО08-18-2008 01:09 AM
тАО08-18-2008 01:09 AM
Re: vmstat - "si" and "so" are 0 why ?
No, not necessarily.
When a process starts it reserves swap. if it never actually gets swapped you won't see swap-in or swap-out values.
It means you are not out of memory and paging to disk.
This is a good thing.
:-)
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тАО08-18-2008 07:11 AM
тАО08-18-2008 07:11 AM
Re: vmstat - "si" and "so" are 0 why ?
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тАО08-19-2008 04:10 AM
тАО08-19-2008 04:10 AM
Re: vmstat - "si" and "so" are 0 why ?
nice reply. from your reply what I got is that .. that the process simply reserves the swap in anticipation but it does not means that the process is also actually using swap area(virtual memory) ? and it also means that once a process actually starts using swap area(usually due to lack of phys memory).. at that particular time/moment si/so will be greater then 0 .. right ?
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тАО08-19-2008 05:38 AM
тАО08-19-2008 05:38 AM
Re: vmstat - "si" and "so" are 0 why ?
http://www.redbooks.ibm.com/abstracts/redp4285.html
and here is a good site about memory management in Linux:
http://linux-mm.org/
I realize this is above and beyond vmstat output.