[CentOS] swapping on centos 5.1

William Warren hescominsoon at emmanuelcomputerconsulting.com
Fri Feb 1 13:41:09 UTC 2008


you can also flush the swap with a swapoff -a wait till it flushes then 
swapon -a

Johnny Hughes wrote:
> Jerry Geis wrote:
>> Hi all,
>>
>> I used to use centos 4.5 on an AMD 4800+ with 2GIG ram.
>> Now I use centos 5.1 on AMD 6400+ with 4GIG RAM.
>>
>> The system responsiveness is different between the two.
>> I noticed that centos 5.1 seems to be swapping programs out
>> of memory at times resulting in slowness (perceived by me).
>>
>> I played with swappiness (/proc/sys/vm/) setting to 10, then 1 then 0.
>> Still resulted in the same perceived slowness.
>> Today I did swapoff -a and now the system obviously does not swap
>> anything out all all. I thought thats what swappiness of 0 would have 
>> done.
>>
>> Are others experiencing this also? The perceived slowness maks the older
>> system with less RAM and slower CPU "seem" faster.
>>
>> Any suggestions on other things to try?
> 
> When you reset swappiness, how did you do it.
> 
> The way that I have had the most luck in is editing /etc/sysctl.conf and 
>  adding:
> 
> vm.swappiness=10
> 
> (or in your case, 0)
> 
> and then:
> 
> sysctl -p /etc/sysctrl.conf
> 
> You would need to then make the things already swapped out come back 
> (will happen over time) .. but rebooting is easier and faster.
> 
> That should work ... but will not prevent all swapping.
> 
> 
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