[K12OSN] LTSP slowness problem
Jim Kinney
jim.kinney at gmail.com
Tue Apr 14 12:15:34 UTC 2015
That python process is eating the system.
Need cpuinfo as well. How many cores? A single core can get bogged down
swapping memory out between user jobs and system jobs.
Note: Intel cpus use their hyperthreading mode. That's only useful for
processes that are shared memory. When the use is non-shared memory work,
hyperthreading can actually slow down the system. I turn it off by default
in the bios.
On Apr 14, 2015 7:32 AM, "Kenneth Lundström" <kenneth.lundstrom at nudata.fi>
wrote:
> Hi,
>
>
> here is a small capture of top results:
>
> top - 14:29:39 up 11 days, 5:43, 6 users, load average: 1,98, 2,16, 2,03
> Tasks: 402 total, 3 running, 397 sleeping, 1 stopped, 1 zombie
> %Cpu(s): 12,4 us, 3,8 sy, 0,0 ni, 81,7 id, 2,0 wa, 0,0 hi, 0,1 si,
> 0,0 st
> KiB Mem: 16593728 total, 9841308 used, 6752420 free, 291936 buffers
> KiB Swap: 16773116 total, 0 used, 16773116 free. 6716260 cached Mem
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 11101 xx1 20 0 110524 34928 21764 R 100,0 0,2 10231:46 python
> 18506 xx1 20 0 1000664 278496 45620 S 16,9 1,7 13:57.25 firefox
> 32129 xx2 20 0 784320 274336 44752 S 3,0 1,7 12:11.78
> thunderbird
> 32133 xx2 20 0 1058788 352892 46728 R 2,7 2,1 13:16.16 firefox
> 31698 root 20 0 10144 3268 2508 S 1,7 0,0 0:00.11 sshd
> 23 root 20 0 0 0 0 S 0,7 0,0 8:25.98
> ksoftirqd/3
> 16121 root 20 0 0 0 0 S 0,7 0,0 0:05.42
> kworker/1:2
> 18 root 20 0 0 0 0 S 0,3 0,0 10:11.20
> ksoftirqd/2
> 38 root 20 0 0 0 0 S 0,3 0,0 9:52.39
> ksoftirqd/6
> 43 root 20 0 0 0 0 S 0,3 0,0 8:30.15
> ksoftirqd/7
> 1776 xx3 20 0 335288 41872 19920 S 0,3 0,3 0:50.63
> plugin-containe
> 16798 xx4 20 0 874020 292644 45340 S 0,3 1,8 1:27.02 firefox
> 19382 xx4 20 0 233152 26560 16572 S 0,3 0,2 0:07.70
> plugin-containe
> 30002 xx2 20 0 231240 27512 17564 S 0,3 0,2 0:01.89
> plugin-containe
>
> If I remember correctly it is running on two harddisk but in mirror mode.
>
>
>
> Kenneth
>
>
>
> -----Original message-----
> *From:* Jim Kinney <jim.kinney at gmail.com>
> *Sent:* Tuesday 14th April 2015 14:27
> *To:* Support list for open source software in schools. <k12osn at redhat.com
> >
> *Subject:* Re: [K12OSN] LTSP slowness problem
>
> Sounds like the server is just too weak for the load. RAM matters.
> Multiple hard drives can make a big difference.
> 1g network for only 7 clients is plenty unless its all youtube videos.
> On Apr 14, 2015 7:01 AM, "Kenneth Lundström" <kenneth.lundstrom at nudata.fi>
> wrote:
>
>> Hello everyone,
>>
>>
>> I have a strange problem that I have been trying to solve for months.
>>
>>
>> A client have a setup of 6-7 LTSP terminals and one server. Because of
>> room structure we need to have 3 switches, all are 1 GB. Server has one 1GB
>> network card. As I couldn't get LTSP working on CentOS 7 I switched to
>> Ubuntu.
>>
>>
>> Problem is the slowness of the clients. If 1-2 are working everything is
>> fine, but when we have like 5 working the same time we get slowness, like
>> when writing an email in Thunderbird it just stops showing the writing on
>> the screen.
>>
>>
>> I swtich away from KDE to LightDM (I think was the name), still same.
>>
>>
>> One thing we think might be the problem is the filemanager. When somebody
>> open filemanager and looks at the folder with like 100 files everything
>> stop. All files are on the same server as LTSP is running.
>>
>>
>> Any ideas where to look for the problem and solving it.
>>
>>
>>
>> Kenneth
>>
>>
>>
>> _______________________________________________
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>> K12OSN at redhat.com
>> https://www.redhat.com/mailman/listinfo/k12osn
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>>
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