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тАО01-04-2009 09:21 AM
тАО01-04-2009 09:21 AM
Vmstat
i am working with vmstat output of few systems,
i want to understand the "sr" column in vmstat output. and it's significance in performance determination.
Pls help out.
Thanx in Advance
Sandeep
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тАО01-04-2009 09:42 AM
тАО01-04-2009 09:42 AM
Re: Vmstat
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тАО01-04-2009 09:44 AM
тАО01-04-2009 09:44 AM
Re: Vmstat
sr Pages scanned by clock algorithm, per second
I assume this means it has to look at lots of pages in order to find the pages to swap out to make room?
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тАО01-04-2009 11:20 AM
тАО01-04-2009 11:20 AM
Re: Vmstat
Do you mean to say high scan rates indicates,shortage of swap memmory.
and i will be seeing swap utilization approaching to it's full capacity.in swapinfo at that time.
Sandeep
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тАО01-04-2009 05:30 PM
тАО01-04-2009 05:30 PM
Re: Vmstat
No, a shortage of RAM, memory pressure.
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тАО01-04-2009 11:02 PM
тАО01-04-2009 11:02 PM
Re: Vmstat
Thnks for reply
I meant shortage of swap only.
according to me,
Since "sr" in vmstat is scan rate by memory manager ( page replacement algorithm as mentioned in man page ) to lookfor free pages in swap.and if this scanning more to find a free swap page. it indicates that real memory as well as swap is also falling in shortage.
so what i meant is swap shortage with RAM shortage. so in t his case in swapinfo i may see swap utilization approaching it's capacity.
this is what i feel.
i just want ensure my conclusion from experts.
Pls. correct me if i m wrong.
Sandeep
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тАО01-05-2009 01:35 AM
тАО01-05-2009 01:35 AM
Re: Vmstat
No, it doesn't take a lot of time to allocate swap. It is too small to be worth measuring.
>Since "sr" in vmstat is scan rate by memory manager to look for free pages in swap
No, the memory manager looks for pages in memory.
>if this scanning more to find a free swap page. it indicates that real memory as well as swap is also falling in shortage.
A free page to page out.
>so what I meant is swap shortage with RAM shortage. so in this case in swapinfo I may see swap utilization approaching its capacity.
This is unrelated to sr.