Re: Performance degradation after KDE runs for sometime

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On Friday, November 12, 2010 22:14:34 you wrote:
> On Fri, Nov 12, 2010 at 3:55 PM, Marko Vojinovic <vvmarko@xxxxxxxxx> wrote:
> > I traced the issue down to swap usage --- after a couple of days of
> > running, *something* seems to gradually fill the memory with junk
> 
> Run top and type "M".  That will sort process by their resident memory
> usage.  It won't had to spot the offender.

Ok, sure, I've been advised to do this before, and I've done it many times, 
but somehow I'm not any smarter after looking at top output. Maybe I am 
reading it wrong, but it just confuses me even further. Here goes, sorted by 
memory usage:

top - 22:16:38 up 10 days,  5:11,  5 users,  load average: 0.38, 0.45, 0.37
Tasks: 200 total,   1 running, 199 sleeping,   0 stopped,   0 zombie
Cpu(s): 10.4%us,  8.5%sy,  0.0%ni, 79.9%id,  1.0%wa,  0.0%hi,  0.2%si,  0.0%st
Mem:   2048088k total,  1657424k used,   390664k free,    18640k buffers
Swap:  4192956k total,  1038432k used,  3154524k free,   566580k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                                                                                                                       
 2528 vmarko    20   0 2029m 171m  19m S  1.3  8.6 564:19.55 firefox                                                                                                                                                                       
 2397 vmarko    20   0  366m 148m 7460 S  1.3  7.4 230:40.39 skype                                                                                                                                                                         
 2366 vmarko    20   0  565m  92m 3044 S  0.0  4.6  12:10.68 emerald                                                                                                                                                                       
 5723 vmarko    20   0  989m  82m  17m S  0.0  4.1  10:29.49 kmail                                                                                                                                                                         
 1739 root      20   0  471m  59m  11m S 19.9  3.0   3780:01 X                                                                                                                                                                             
 2021 vmarko    20   0 1380m  57m 9476 S  6.3  2.9 780:37.22 ktorrent                                                                                                                                                                      
 2016 vmarko    20   0  293m  42m 8176 S  0.7  2.1 137:01.00 skype                                                                                                                                                                         
 2222 vmarko    20   0  789m  28m 5436 S  0.0  1.4  11:05.85 cairo-dock                                                                                                                                                                    
 1998 vmarko    20   0  937m  20m 8824 S  4.3  1.0 804:03.95 plasma-desktop                                                                                                                                                                
 2603 vmarko    20   0  546m  18m 7088 S  0.0  0.9   1:39.64 kile                                                                                                                                                                          
22635 vmarko    20   0  480m  12m 6452 S  0.7  0.6  43:06.53 konsole                                                                                                                                                                       
 2053 vmarko     9 -11  501m  12m  11m S  0.3  0.6 259:54.25 pulseaudio                                                                                                                                                                    
10764 vmarko    20   0  455m 8572 4608 S  0.0  0.4   1:07.09 okular                                                                                                                                                                        
32679 vmarko    20   0  285m 8528 5616 S  0.0  0.4   0:00.11 kio_pop3                                                                                                                                                                      

So what do you make of it?

First 14 processes take up (together) 37.4 %MEM. Except for the last one (I 
have no idea what is kio_pop3), all of those are active simultaneously on my 
desktop most of the time.

I have 2 GB of RAM and 4GB of swap, and apparently most of the RAM is used up 
and an extra 1 GB of swap. So what apps are using up the remaining 62.6 %MEM?

Is there a way to list all processes, sorted by memory usage? Top truncates 
the output to the height of the terminal, and I would really like to see if 
the %MEM is actually summed up to 100 for all processes.

By the way, does MEM column refer to RAM or RAM+swap? In any case, I don't see 
why my 10+ apps, using a total of 37% of memory can force the system to use 
1GB of swap, on top of 2GB RAM.

Is there a way to check which pages (belonging to which apps) are being 
swapped out? Furthermore, is there a way to understand why is this being 
done? What is occupying all that RAM if Firefox and KMail are routinely 
swapped out and thus behave in an extremely sluggish way until they finally get 
focus (and get swapped back to RAM)?

I guess it should be a sane system policy that apps currently open on the 
desktop not be swapped, unless there is no more RAM for all of them. But all 
my desktop apps take up only 37% of that RAM, so why do they get swapped out 
in the first place?

I'd appreciate any clarification on this matter.

Best, :-)
Marko

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