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тАО08-15-2003 08:32 AM
тАО08-15-2003 08:32 AM
Swap usage
I have one question about swap. I have a system that is having almost 20% of swap area all the time. When I turn the database and all the otther applications off, this value begins to decrease, but will never be zero.
If I restart the system, and don't start any other application this value will be zero all the time.
Why does this vale not become zero?
I have 1 GB of memory and 2 GB of swap space.
Thanks
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тАО08-15-2003 08:41 AM
тАО08-15-2003 08:41 AM
Re: Swap usage
It's not really surprising that the value doesn't return to zero. Consider the case of a daemon, it's really doing absolutely nothing unless a request comes in; only then is it awakened. There is really no need to page this process back in until that moment.
You really need to use Glance (or vmstat) and examine the pageout rate. If the pageout rate is anything other than very small, your system is definitely under memory pressure.
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тАО08-15-2003 09:31 AM
тАО08-15-2003 09:31 AM
Re: Swap usage
The pageout rate is about then. do you think this is a high number?
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тАО08-15-2003 10:22 AM
тАО08-15-2003 10:22 AM
Re: Swap usage
Is it in the reserved area or on the dev line ?
In swapinfo -t output, you will see several lines.
The "dev" lines show actual usage in the PCT USED column.
The "reserved" line shows space reserved for paging.
The "memory" line will appear if you are using psuedo swap.
Obviously the "total" line will be there as well on a swapinfo -t.
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тАО08-15-2003 10:27 AM
тАО08-15-2003 10:27 AM
Re: Swap usage
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тАО08-15-2003 07:33 PM
тАО08-15-2003 07:33 PM