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CPU, schmepeu

By vetler. Wednesday, 7. February 2007, 18:58:46

Hi folks, Vetle here... Just wanted to talk a little about our server status. To the right is a graph showing CPU usage on fatboy, and as you can see it has a tendency to spike. Fatboy is the server used by everyone that is not logged in... They get substantially better hardware, as there are so fracking many of them! You guys (or faithful users) must be generating lots of interesting content, keep up the good work. :up:

The spikes in the graph shows that the server is having some problems, and there seems to be some kind of magic upper limit that it's hitting. Ole Kasper did a few tweaks this evening, and things might improve. The regular 18:00UTC spike has not appeared, so things are looking good for now.

It still remains to see if this holds, though.

*crosses fingers*

Oops. Power's out.Sneak preview of upcoming My Opera site

Comments

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Maybe we should try disabling hyperthreading on the box... I mean---who needs 32 CPUs anyway? :cat:

Some weird stuff showing on the graphs right about now, but it went away... *crosses more fingers*

By olekasper, # 7. February 2007, 19:35:58

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from about 19.00 cet. to about 21.30 cet. I had problem and got stocked about using Opera Mini on my mobile phone is that the reason why I couldn't surfe around as normal it wouldn't load the pages that I wanted to goto like normal

By khadwar_neang_666, # 7. February 2007, 20:32:47

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They get substantially better hardware, as there are so fracking many of them!

Ah yes, all the anonymous spammers...

:smile:

By haavard, # 7. February 2007, 22:03:47

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What does "system" mean ? Database processes ?

By dantesoft, # 8. February 2007, 06:41:09

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'System' means the time MySQL (our database software) is spending on doing system calls, rather than doing any 'actual' work. We're a bit baffled by this behaviour, but I did some fiddling so let's see if it helps.

By olekasper, # 8. February 2007, 07:36:29

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You have some problem with your munin graph also. It goes up to 1000 and you have 2879 something idle time? Normaly munin prints iowait from the top down in the graph but nut sure you are seeing this in this graph since the scale is dead wrong.

By rocco, # 9. February 2007, 17:12:27

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Munin graphs 100% per CPU, but doesn't adjust the scale for anything over 1000% (10 CPUs). We have 32 CPUs (including dual cores and hyperthreading) .. P:

By olekasper, # 10. February 2007, 13:08:18

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Yes I know.... but the problem is that it looks that you will never see the iowait, irq softirq, cause they are drawn from the top and then down. That is they are not added to the system, user graphs. Not sure how this is handled when values are bigger then 1000%. You'll se what I'm talking about if you look at the grapghs from a machine with less cpus :smile:

Just wanted to help you with your problem, and it might not be wise to look at theese graphs since they don't graph everything in your case.

By rocco, # 10. February 2007, 16:46:35

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Hmmmm, so we saw another spike on Monday. Now, we've restarted fatboy after disabling hyperthreading. It is currently catching and caching up. Once that's done, we hope that might fix the problem.

By kjetilk, # 13. February 2007, 13:03:00

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rocco, agreed, it may be highly misleading looking at the graph when it doesn't show the 'entire picture' so to speak. However, sice we have a slightly ridiculous amount of RAM on the box, IOWait is hardly an issue (it never really reads from disk, it only writes occationally :D).

Everything does indeed look better without HyperThreading enabled. We'll see over the weekend whether it has actually improved.

By olekasper, # 14. February 2007, 10:13:44

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