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Re: [K12OSN] LTSP slowness problem



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 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 gmail com>
Sent: Tuesday 14th April 2015 14:27
To: Support list for open source software in schools. <k12osn 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 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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