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тАО01-19-2005 05:43 PM
тАО01-19-2005 05:43 PM
swap space problem
swap space is 3G
now we added the memory to 5G
but now when I execute #vmstat
and in /var/adm/syslog.dated/*/kern.log
Jan 20 13:42:56 yj8201 vmunix: swap space below 10 percent free
Jan 20 13:43:37 yj8201 last message repeated 3 times
Jan 20 13:45:39 yj8201 last message repeated 9 times
Jan 20 13:55:29 yj8201 last message repeated 36 times
but when i execute #swapon -s
yj8201#swapon -s
swap space below 10 percent free
Swap partition /dev/rz8b (default swap):
Allocated space: 262144 pages (2048MB)
In-use space: 1 pages ( 0%)
Free space: 262143 pages ( 99%)
Swap partition /dev/rz10b:
Allocated space: 125000 pages (976MB)
In-use space: 1 pages ( 0%)
Free space: 124999 pages ( 99%)
Total swap allocation:
Allocated space: 387144 pages (3024MB)
Reserved space: 365180 pages ( 94%)
In-use space: 2 pages ( 0%)
Available space: 21964 pages ( 5%)
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тАО01-19-2005 06:38 PM
тАО01-19-2005 06:38 PM
Re: swap space problem
Formular: swapspace = 2.5 times physical memory
Have a look to the "reserved memory" information!
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тАО01-19-2005 07:43 PM
тАО01-19-2005 07:43 PM
Re: swap space problem
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тАО01-19-2005 07:49 PM
тАО01-19-2005 07:49 PM
Re: swap space problem
Seems you have eager(=immediate mode) swapping enabled.
(See "ls -l /sbin/swapdefault" ) and maybe
you (or the DBA)told Oracle instances to use a larger SGA.(why else would you have added memory to the system ;-)
With the additional 2GB, you probably can go for using "deferred" swap-mode. To do this, rename the /sbin/swapdefault link to something like /sbin/swapdefault.off , and reboot.
Read the swapon manpage for additional info.
__ Johan.
_JB_
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тАО01-20-2005 05:28 AM
тАО01-20-2005 05:28 AM
Re: swap space problem
The operating system terminates a process if it attempts to write a modified virtual page to swap space that is depleted.
In other words, if you use deferred mode and the swap space isn't large enough, the OS will start deleting processes.
Vic
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тАО01-20-2005 07:04 PM
тАО01-20-2005 07:04 PM
Re: swap space problem
For the case in this topic, process start to fail when total virtual memory in the system exceeds the total swap space (somewhere around 3 GB). If deferred (lazy) swap was enabled, processes would start to die when total virtual memory exceeds total swap + total memory (3 GB + 5 GB = 8 GB).
If use of internal memory was over committed by 3 GB on the swap space, then the system would probably be so slow that you would welcome processes being stopped.
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тАО01-21-2005 07:18 AM
тАО01-21-2005 07:18 AM
Re: swap space problem
Vic
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тАО01-23-2005 07:35 PM
тАО01-23-2005 07:35 PM