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Resource Usage at New VPS Server - Part Deux (Read 29014 times)
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Resource Usage at New VPS Server - Part Deux
Mar 6th, 2008 at 3:56pm
 
This thread is a continuation from the original, found here:

http://radified.com/cgi-bin/yabb2/YaBB.pl?num=1203643962
 
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Rad
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Re: Resource Usage at New VPS Server - Part Deux
Reply #1 - Mar 6th, 2008 at 4:03pm
 
This is not about resource usage specifically, but you may be interested nonetheless (just received from WiredTree):

Quote:
cPanel confirms a root exploit affecting all current installations of Horde (web mail). No fix is currently available. cPanel recommends disabling Horde until they post a patch. We are disabling Horde on all servers. Please do not re-enable it until further notice or it will put your server at severe risk of being compromised.

We recommend all users use Squirrelmail until Horde is fixed. If you have previously disabled Squirrelmail, you can re-enable it inside your server's WebHostMgr under Server Configuration >> Tweak Settings. We will post an update in Grove when cPanel has issued a fix and it is safe to re-enable Horde.
 
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Re: Resource Usage at New VPS Server - Part Deux
Reply #2 - Mar 6th, 2008 at 6:59pm
 
Here's a question for Magoo, or one of you othe Linux guru's ..

Are there things my web host (WiredTree) can do to affect the memory/RAM usage on our VPS account?

Seems memory usage is the limiting factor on an account.

Say, for example, we start running close to our limit (384 MB). Are there things you can do as a Linux admin to bump that up tothe limit (and therefore tell the client they need to upgrade to a pricier ho$ting plan)?

Conversely, are there also things they can do to restrict our memory/RAM usage .. and give some of our memory to another account .. and therefore earn more money from our particular server???

If so, would these memory-restricting techniques affect the performance of our account/server.

Or am I being paranoid?

Just seems like when we first opened the account, there were no problems, and memory usage was steady at around 270-280 MB. Now it down around 200-220, and it seems like we've been experiencing performance issues.

What say ye?

Is there anything I can do to ensure we're being properly served? (small pun there) You know the old adage > "You get what you inspect, not what you expect."

...
 
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Re: Resource Usage at New VPS Server - Part Deux
Reply #3 - Mar 6th, 2008 at 7:14pm
 
Here's today's load stats .. in case you're interested:

...

Remember there is a 2-hour difference between here and Chicago.
 
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Re: Resource Usage at New VPS Server - Part Deux
Reply #4 - Mar 6th, 2008 at 7:19pm
 
While I'm at it .. here's the WEEKLY view (of server load):

...

This weekly view shows it going up to only 8 or 9, whereas the daily view shows it hitting 20 or 21. They say the daily view is "most accurate".
 
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Re: Resource Usage at New VPS Server - Part Deux
Reply #5 - Mar 6th, 2008 at 9:08pm
 
Here's a tracert I just ran:

...

Response:

Quote:
It looks like there was a slight load spike that has since passed. Are you still experiencing issues with the server?
 
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Re: Resource Usage at New VPS Server - Part Deux
Reply #6 - Mar 6th, 2008 at 9:37pm
 
The way memory is allocated depends on the virtualization technology.  Some of them statically set aside a certain amount for you.  Some of them just make sure you don't go over your allocation.  Either way, I seem to remember you saying Wired Tree doesn't oversubscribe their host nodes, so you shouldn't have to worry about other sites using your memory.

There's not much they could do to inflate you memory usage, nor do I think they would do it.  It would be easy to detect given the shell access you have and would be a huge risk for them - a potential law suit just to make a few dollars a month.  I don't think either of your hosts have given you false numbers.  Usage dropped on the Lunar Pages server as expected once you moved traffic to the new site, so I think their numbers were real.

It is entirely possible that our intermittent lag is being caused by something other than memory usage.  It could be processor usage, or, most likely it is I/O starvation.  In other words, the hard drive or the front side bus can't keep up with the processor and memory.  From the email Wired Tree sent you, it sounds like another site on your server was causing to much I/O usage and they sent them a warning or some similar situation.  This is all speculation, of course, since I don't have access to either the host node or your site.
 
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Re: Resource Usage at New VPS Server - Part Deux
Reply #7 - Mar 6th, 2008 at 9:48pm
 
Well, the virtualization technology is Virtuozzo 4:

http://www.parallels.com/en/products/virtuozzo/

That much I know.
 
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Re: Resource Usage at New VPS Server - Part Deux
Reply #8 - Mar 7th, 2008 at 1:37am
 
Memory usage is back up to 276. (MB)
 
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Re: Resource Usage at New VPS Server - Part Deux
Reply #9 - Mar 7th, 2008 at 7:56am
 
Uh, now it's 292 (max'ing out at 297).

...
 
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Re: Resource Usage at New VPS Server - Part Deux
Reply #10 - Mar 7th, 2008 at 11:01am
 
Memory usage variations probably have a lot to do with cache info.  Apache caches info once it grabs it so that repeated requests for the same page don't cause undue load.  How much memory is used probably depends on how many threads and which ones have been active in the last few days.  I wouldn't worry about it unless you get close to your limit.
 
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Re: Resource Usage at New VPS Server - Part Deux
Reply #11 - Mar 7th, 2008 at 12:13pm
 
Thanks bro.

I'm kinda sensitive to "limits" right now, due to our recent unfortunate experiences at Lunarpages.
 
 
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Re: Resource Usage at New VPS Server - Part Deux
Reply #12 - Mar 7th, 2008 at 3:55pm
 
Look like our maximum memory usage, so far, is 308 MB:

...
 
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Re: Resource Usage at New VPS Server - Part Deux
Reply #13 - Mar 7th, 2008 at 4:12pm
 
Here's another statistic they provide, called "Processes" .. tho I'm not sure exactly what this is:

...

We usually have somewhere around 100, most of the time. More processes running usually correspond to more memory usage .. tho I haven't analyzed it that closely.
 
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Re: Resource Usage at New VPS Server - Part Deux
Reply #14 - Mar 7th, 2008 at 4:25pm
 
The final metric WiredTree provides is called TCP Sockets. Again, not sure what this is telling me:

...

These numbers remain fairly constant .. to what you see here.
 
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