On 06/11/2010 05:23 PM, Timothy Murphy wrote:
> Aaron Konstam wrote:
>
>>> Actually, these give the same information in this case as "top", eg
>>> ----------------------------------
>>> [tim@alfred ~]$ sudo swapon -s
>>> Filename Type Size Used Priority
>>> /dev/sdb3 partition 1959920 0 -1
>>> ----------------------------------
>>>
>>> It seems that swap is not being used, for some reason.
>>> This machine has just under 1GB RAM (the max for this motherboard)
>>> so it is not clear why swap is not in use.
>>>
>> I can think of may reasons for swap not to be used at a particular
>> moment.For example, at this moment the swap on my desktop has 0 bytes
>> used. If swap is never used then one can start worrying.
>
> As far as I can see, it is never being used.
> I've checked on my other machines, and they all show some swap usage,
> even if it is very small, eg 144 (I assume this is 144k) on my server,
> with 4GB RAM.
>
> The old machine I'm talking about has less than 1GB RAM,
> and is running Fedora-12, so surely it must need to swap sometimes.
>
> Is there any way of forcing a machine to swap?
Create a big ramdisk that eats most of the memory and run a bunch
of programs. Here's an example command to suck up 80% of your RAM into
a ramdisk:
# mount -t tmpfs -o mode=0777,size=80% tmpfs /mnt
Disk will be mounted at /mnt. Unmount /mnt to free the memory back up.
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