How to clear memory?

[Lisa Kachold]

Hi Joe,

On Tue, Nov 20, 2012 at 8:35 AM, <joe at actionline.com> wrote:

>
> Yesterday, I tried to post this question to plug,
> but it was bounced back as undeliverable.  Wonder why?
>

Evidently there are problems with stability at Deru?
Many in PLUG over the years have offered to donate hosting, however, Hans
has never agreed to it.   DeVry University provides some level of services
for the BigBlueButton server at a local colocation that also might be used,
as I understand it.   Moving the domain is actually quite easy since it's
hosted under the .US name.

>
> Anyway, here it is again:
>
> My systems have begun to run very slowly.
>

Joe, we need EXACT details.  "My systems have begun to run very slowly" is
not sufficient.

What systems?

Please send us the output of:

uname -a
free
ps -aux
dmesg [last 20 lines]
tail -n 100 /var/log/messages
ethtool eth0 (or whatever your net is defined as) or wlan0


> Is there some way to clear memory without shutting down or logging out and
> back in?
>
You should never need to "clear memory".  There would never, in a linux
environment be an instance where "clearing memory" would be required.
If you are low on swap and your system starts paging, you can add addtional
swap, but I doubt that is the issue.  We will evaluate after reading the
requested info above.

>
> Actually, even when I log out and back in, they are still slower than what
> has been normal.
>

Is this more than 1 system?


>
> Especially Firefox has become much slower than what has been normal in the
> past.
>

Recommendations:

Clear your browser cache regularly.
Use a NoScript plugin to ensure javascript backdoors and virus are not
invisibly installed.
Switch to Chrome

>
> Also, when I tried to check plug threads today, I couldn't get the plug
> website to open, though other websites seem to be working fine (albeit
> slower than normal).
>

I believe we have determined that this was intermittent from some providers
and not from others, therefore it's most probably that this was due to a
Least Cost Routing issue after a change in the BGP tables, which is
regularly done by big providers to take advantage of cheaper bandwidth.

Of course Deru might have lost one of two dual honed upstream providers,
whereupon it can take up to 24 hours for all routes to equalize and update.

Since Deru hosts the DNS and was unreachable, the authoritive servers could
not be reached, and mail was therefore also DROPPED for anyone in the
outage zones.

We should at the very least obtain free offsite secondary DNS services for
the plug.phoenix.az.us DNS, which are available for free.

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