How do i kill hanging applications?

Post here if you are a new Porteus member and you're looking for some help.
Post Reply
fred08155
Black ninja
Black ninja
Posts: 56
Joined: 22 Apr 2016, 07:11
Distribution: Porteus 3.2.2 xfce
Location: Germany

How do i kill hanging applications?

Post#1 by fred08155 » 01 Dec 2016, 00:33

Using porteus 3.2 64bit kde with kernel 4.8.8.
Recently i noticed it´s quite easy to get applications hanging with high CPU usage and desktop not responding anymore.
Easiest way is to use an internet browser and open some tabs on ebay.
Without javascript most sites work OK. But once javascript is on browser easily locks up. Especially on ebay. Unfortunately ebay cannot be used without javascript.
Only two tabs of ebay where necessary to lock up browsers - may it be chrome based like chromium or vivaldi or opera and even good old firefox.
Only konqueror did not lock up on ebay but the rendering of many sites including ebay is very very poor.

How do i end or kill a hanging app? Is there something like the task manager on windows?

I don´t have these problems under Windows 7. Sometimes browser (most time i use chromium based Iron) uses very large amounts of memory or crahses rarely but never locked up the system.

What´s the easiest way to end a hanging app? Do i need to change to console? If yes how are the commands to get there, kill the hanging app and get back to graphical environment?

Some operations still work like clock is running and rarely one of the function keys responds like the wifi switch or the sound keys.
When i press power button system is shutting down after a few seconds. But then i loose any data that is not saved from memory and it´s also very annoying to reboot every few minutes.

Or is there a way to prevent browsers from hanging?
I installed some extensions for ad blocking and script blocking. But as soon as javascript is turned on the problem is back.

User avatar
brokenman
Site Admin
Site Admin
Posts: 5657
Joined: 27 Dec 2010, 03:50
Distribution: Porteus v3.2rcX all desktops
Location: Brazil
Contact:

Re: How do i kill hanging applicaions?

Post#2 by brokenman » 01 Dec 2016, 00:47

Hi Fred,

Can you explain further what you mean by 'turning on javascript' please?
I currently have google chrome open with between 10-15 ebay tabs open and top shows chrome using ~6% of CPU resources. Firefox for me is almost unusable. Very laggy and resource hungry.
How do i become super user?
Wear your underpants on the outside and put on a cape.

User avatar
wread
Module Guard
Module Guard
Posts: 1116
Joined: 09 Jan 2011, 18:48
Distribution: Porteus v3.2.5-kde5-64 bits
Location: Santo Domingo
Contact:

Re: How do i kill hanging applicaions?

Post#3 by wread » 01 Dec 2016, 00:49

Start>>Applications>>System>>System Monitor>> then select the hanging application, right click on it and then select "kill" and you are done! :D
Porteus is proud of the FASTEST KDE ever made.....(take akonadi, nepomuk and soprano out and you will have a decent OS).
The Porteus Community never sleeps!

User avatar
francois
Contributor
Contributor
Posts: 5136
Joined: 28 Dec 2010, 14:25
Distribution: xfce plank porteus artix
Location: C'est l'hiver: la neige soudainement est là à Montréal.

Re: How do i kill hanging applicaions?

Post#4 by francois » 01 Dec 2016, 00:51

In terminal:

Code: Select all

xkill
then just move the squeleton head over the application to be killed and click. :evil:

In my case the problem on older machines is more with google-chrome. It depends on how you use the browser.
Carpe diem.

fred08155
Black ninja
Black ninja
Posts: 56
Joined: 22 Apr 2016, 07:11
Distribution: Porteus 3.2.2 xfce
Location: Germany

Re: How do i kill hanging applicaions?

Post#5 by fred08155 » 01 Dec 2016, 01:13

brokenman wrote:Hi Fred,

Can you explain further what you mean by 'turning on javascript' please?
Sure. I use extension ScriptBlock for this.

Nice hints but the problem is that i can´t start something from the menu since i get absolutely no reaction from desktop environment.

How do i get into terminal when there is no reaction from desktop environment?

As always i use HP elitebook 2540p with Intel i7 L640 dual core 2.13GHz with 4GB DDR3 RAM.
Machine too weak for porteus?

donald
Full of knowledge
Full of knowledge
Posts: 1247
Joined: 17 Jun 2013, 13:17
Distribution: Porteus 3.2.2 XFCE 32bit
Location: Germany

Re: How do i kill hanging applicaions?

Post#6 by donald » 01 Dec 2016, 01:30

If the GUI is unresponsiv so you can not open the Taskmanager
you can switch to a terminal
In Linux each running process has a process ID.If you know the process ID
of the misbehaving program you can use: kill <processID>
If you don’t know the process ID use the pgrep command to find out.
Example -- (misbehaving mousepad in this case)

Code: Select all

guest@porteus:~$ pgrep mousepad
5081
guest@porteus:~$ kill 5081
guest@porteus:~$ 
You can also use the pkill command to kill using process name (= mousepad)

Code: Select all

guest@porteus:~$ pkill mousepad
one more
There is also the killall command
eg killall firefox will kill all windows and Firefox profiles which are currently running.

-> How do i get into terminal when there is no reaction from desktop environment?<-
Try ctrl + alt + F1 (ctrl = strg in german keyboard)
log in > kill whatever > exit > ctrl+alt+F7 to switch back to desktop.

Bogomips
Full of knowledge
Full of knowledge
Posts: 2563
Joined: 25 Jun 2014, 15:21
Distribution: 3.2.2 Cinnamon & KDE5
Location: London

Re: How do i kill hanging applicaions?

Post#7 by Bogomips » 01 Dec 2016, 01:35

fred08155 wrote: How do i get into terminal when there is no reaction from desktop environment?
Go to Console with Ctl+Alt+F1/F2/..F6
Then when have a script problem normally kill plugin container. So after logging in as guest, (pw guest),

Code: Select all

pkill  plugin-con
. In my case wait till disk light no longer glowing, then return to DE with Alt+F7.. If no plugin then: pkill firfox :twisted:
Linux porteus 4.4.0-porteus #3 SMP PREEMPT Sat Jan 23 07:01:55 UTC 2016 i686 AMD Sempron(tm) 140 Processor AuthenticAMD GNU/Linux
NVIDIA Corporation C61 [GeForce 6150SE nForce 430] (rev a2) MemTotal: 901760 kB MemFree: 66752 kB

User avatar
francois
Contributor
Contributor
Posts: 5136
Joined: 28 Dec 2010, 14:25
Distribution: xfce plank porteus artix
Location: C'est l'hiver: la neige soudainement est là à Montréal.

Re: How do i kill hanging applicaions?

Post#8 by francois » 01 Dec 2016, 02:43

For complete freeze:
http://unix.stackexchange.com/questions ... op-freezes
Raising Elephants Is So Utterly Boring
Alt+SysRq+R switch keyboard to 'raw' mode
Alt+SysRq+E send SIGTERM (termination) signal to all processes except mother init
Alt+SysRq+I send SIGKILL signal to all processes, a little more aggressive
Alt+SysRq+S sync all filesystems to prevent data loss
Alt+SysRq+U remount filesystems as read-only
Alt+SysRq+B forcefully reboot
Carpe diem.

Bogomips
Full of knowledge
Full of knowledge
Posts: 2563
Joined: 25 Jun 2014, 15:21
Distribution: 3.2.2 Cinnamon & KDE5
Location: London

Re: How do i kill hanging applicaions?

Post#9 by Bogomips » 01 Dec 2016, 12:22

Something omitted in previous post, as 1st resort with runaway script, before resorting to Console
francois wrote:For complete freeze:
http://unix.stackexchange.com/questions ... op-freezes
Raising Elephants Is So Utterly Boring
Alt+SysRq+R switch keyboard to 'raw' mode
or raising elephants (last resort), is the Magic Sys Request.

While still in GUI: Alt+SysRq+f will normally knock out the plugin container, less often the browser, whichever is responsible for script gobbling up all the memory, if that is the case. Then you are good to go! 8)
Linux porteus 4.4.0-porteus #3 SMP PREEMPT Sat Jan 23 07:01:55 UTC 2016 i686 AMD Sempron(tm) 140 Processor AuthenticAMD GNU/Linux
NVIDIA Corporation C61 [GeForce 6150SE nForce 430] (rev a2) MemTotal: 901760 kB MemFree: 66752 kB

fred08155
Black ninja
Black ninja
Posts: 56
Joined: 22 Apr 2016, 07:11
Distribution: Porteus 3.2.2 xfce
Location: Germany

Re: How do i kill hanging applicaions?

Post#10 by fred08155 » 07 Dec 2016, 15:40

Yes. Seems to work. At least a little bit. Using the keystrokes porteus dropped back to console and loaded KDE desktop again.
But after login some things didn´t work like Wifi or connected USB devices like USB HDD and USB memory stick did not show up anymore.

After a fresh reboot i checked memory usage. I was very surprised. Fresh booted windows 7 uses around 1GB on my notebook.
Porteus 3.2 with KDE uses 2.5GB of memory with only system info tool loaded.
I guess it´s more an issue of memory leakage than an issue with javascript. 4GB of main memory seem to be too less for usage of KDE on my notebook.
I guess i better go back to XFCE.

Bogomips
Full of knowledge
Full of knowledge
Posts: 2563
Joined: 25 Jun 2014, 15:21
Distribution: 3.2.2 Cinnamon & KDE5
Location: London

Re: How do i kill hanging applications?

Post#11 by Bogomips » 07 Dec 2016, 20:41

^ Apparently the Linux philosophy is to use up as much free memory as it would like to have, if such is available. Am making do with 871 MiB of RAM and 1668 MiB swap space:
  • Code: Select all

    guest@porteus:~$ free -m
                  total        used        free      shared  buff/cache   available
    Mem:            871         583          72          38         216          68
    Swap:          1668         886         781
    

    Code: Select all

    top - 21:18:49 up  2:23,  0 users,  load average: 0.09, 0.32, 0.88
    Tasks: 144 total,   5 running, 139 sleeping,   0 stopped,   0 zombie
    %Cpu(s):  5.0 us,  3.7 sy,  0.0 ni, 88.3 id,  2.3 wa,  0.0 hi,  0.7 si,  0.0 st
    KiB Mem :   892908 total,    67976 free,   599744 used,   225188 buff/cache
    KiB Swap:  1708724 total,   803380 free,   905344 used.    66304 avail Mem 
    
      PID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND              
     1285 guest     20   0 3804696 122896  62404 R  2.6 13.8   4:15.64 plasmashell          
     1778 guest     20   0  682952  33908  19912 R  2.0  3.8   0:18.27 konsole              
     1149 root      20   0  210932  25668   4344 S  1.3  2.9  10:31.84 Xorg                 
     1281 guest     20   0 3254684  96856  35960 R  1.3 10.8   3:18.45 kwin_x11             
     1459 guest     20   0 1125816 227388  22396 S  1.3 25.5  17:51.93 palemoon             
      991 root      20   0    7556    180    156 S  0.3  0.0   0:00.38 gpm                  
     1254 guest     20   0  567160   1316    940 S  0.3  0.1   0:01.86 klauncher            
     1284 guest     20   0  826844   2712   2244 S  0.3  0.3   0:04.08 krunner              
     1660 root      20   0       0      0      0 S  0.3  0.0   0:11.59 kworker/0:0          
        1 root      20   0     240      0      0 S  0.0  0.0   0:00.48 init                 
Above is with Konsole, Kate, and PaleMoon running.
Linux porteus 4.4.0-porteus #3 SMP PREEMPT Sat Jan 23 07:01:55 UTC 2016 i686 AMD Sempron(tm) 140 Processor AuthenticAMD GNU/Linux
NVIDIA Corporation C61 [GeForce 6150SE nForce 430] (rev a2) MemTotal: 901760 kB MemFree: 66752 kB

Post Reply