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cpu lag out

(22 posts) (5 voices)

• Started 11 years ago by jjk
• Latest reply from jjk
• This topic is resolved

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1. 

   jjk
   

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   here's the picture of my htop.

   

   I hope you can understand what's wrong.

   I haven't been able to log vmstat yet, will try next time.

   Posted 11 years ago #
2. 

   christophe
   

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   it does not give an answer to the perf issue. There are 7 threads running, so obviously there is contention for the cpu. It is not the swap that is for sure. It could be disk output

   Can you try/check 3 things

   Make sure htop output gets sorted by cpu when you run vmstat (through F6, select cpu)
   does the problem happen also when firefox is not running ?
   And last, when there is contention, can you see.hear/see if the disk is being heavily (constantly) accessed.

   firefox can require lot of resources under some conditions.

   Posted 11 years ago #
3. 

   jjk
   

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   all foto's about this problem are here:
   https://www.dropbox.com/sh/94qbskj1l2xl8vu/ypJxTrsAFB

   Htop is sorted by CPU.
   Problem does occur when firefox is not running, see most recent picture.
   i can hear the cpu cooling spin very fast, i dont hear any peeps, beeps or anything.

   a bit of extra information, usualy my cpu load is around 1-6% during lag it is at 98-100%.

   Posted 11 years ago #
4. 

   christophe
   

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   it is hard to tell without being in front of the screen and you provide little and static data where more dynamic data is required for a diag, so you will have to investigate a little bit more by yourself

   On the data you provide, when that happens, vmstat shows 100% on system time;
   at that specific time, you need to check htop and spot which is the process using most cpu (the information varies each second, you are looking for using your best guess).

   Sometime the culprit will not appear as you would expect in htop; specially if the lag time is in system time, which from the little data you sent is what is happening (but the data is too little to decide).
   You will have to check for it several time and decide if there is an overwhelming pattern and then an overwhelming process for that. Or a pattern with an application you are using (eg, firefox or midori, or listening to an online radio, or locally to music for example).
   With system time lag i would suspect something tied to the network first, specially if you are using wifi.

   Unless someone else has a better idea to suggest this is the route i would take first.

   Posted 11 years ago #
5. 

   jjk
   

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   I think you're right, firefox and/or spotify were using the most cpu. (about 27% each). I haven't been using firefox and spotify for some time now and it is happening much less frequently.

   the part i don't understand is that the programs are by far not using 100% cpu, but still htop tells me 100% cpu usage, any idea why the cpu goes higher than the program's cpu usage? is there something updating or so?

   much thx for helping

   JJK

   Posted 11 years ago #
6. 

   christophe
   

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   Hard to tell what is happening in your machine without being there.

   It sometimes gets tricky to track down things once they happen in system time; plus it goes down to understand what 100% cpu really means, which may vary with each individual tool...

   Posted 11 years ago #
7. 

   jjk
   

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   ok, I'd say it's solved, as long as i don't use firefox and spotify too much.

   thx for helping.

   JJK

   Posted 11 years ago #

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