on performance in the live session

[Xen]

This is about Kubuntu but I am sure it would apply equally to a Unity 
installation system.





There are some things that are incomprehensible in life. Performance of 
computers is sometimes one of them.


I had a Windows 8 64 bit system with 4GB of memory of which usually 1GB 
was available and in non-dirty buffers. With swap (pagefile) turned on 
and large size, with this amount of free memory I experienced constant 
page file trashing. My system became unusable and I turned the swap off.


Now with the swap off there was still 1GB available in non-dirty buffers 
but I constantly had applications crashing due to memory allocation (out 
of memory) errors.



Today I am in the Kubuntu live session. I start Firefox, with a number 
of pages open (about 12, maybe, in total) and I start LibreOffice 
writer. At first it goes alright.


After a short while however the DVD starts thrashing. I am booting from 
DVD, live session of 16.04.


I manage to close another dialog I had opened (keyboard settings) but 
after that it takes minutes and the system keeps thrashing that DVD and 
I have to turn it off.


But before this final mayhem I manage to get a TTY using ctrl-alt-f2, 
log in using that kubuntu user, and run "free".


4GB ram. 32 MB free. 1.6 GB in IO buffers. The rest used. I am able to 
run df.


The entire /cow system ... actually it might have been filling up, I 
don't remember the number. I was mistaken about its nature, I suspect it 
had already grown to something like 1.2 GB, but I might be wrong.


I had not downloaded anything this session.

The entire DVD, and the loop device (/rofs) is not more than 1.4GB.

How on earth can it be possible that the DVD starts thrashing unless 
those 1.6GB worth of buffers are actually ramdisks and things of that 
nature? That isn't supposed to be the case right.


Actually it does seem to be the case for ramfs.

And I don't know what the /cow on Ubuntu uses.

I can't find anything about it.

Could it be that Firefox is simply storing huge amount of cache files 
and the like? Maybe LibreOffice is generating data as well?


Is the overlayfs on /cow writing to those buffers?

Firefoxes cache is not limited, it might default to that 250 MB that is 
the default value you see when you change it.


That's still not 1.8 GB.

But right after starting the system there is already that 1.6/1.8 GB in 
buffers.


At that point there is still 1.4 GB free.

Something is not right with this system if it starts filling up ram with 
just two programs open.


Something as simple as a paste might get the DVD loading. A copy and 
paste in LibreOffice. Requires disk access.


I lost a lot of text with this crash too.

LibreOffice itself requires 400MB when just started.

Firefox is at this point already running with a few windows open. I 
can't continue writing, my display became corrupted when I maximized 
Konsole.


Starting a YouTube page and Konsole took another 200MB.

Reloading that YouTube page may cause more disk access (DVD access).

I think it is so horrendous and now I have to restart KDE or something.

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Re: ERROR installing G19 Logitech keybourd on linux mint

[J Fernyhough]

On 23 April 2016 at 14:27, Warwick Lake  wrote:
>
> dpkg: error processing package g15macro (--configure):
>  dependency problems - leaving unconfigured
> Errors were encountered while processing:
>  g15daemon
>  g15macro
> E: Sub-process /usr/bin/dpkg returned an error code (1)
>

This would probably be better posted on the Linux Mint forums than the
Ubuntu Development Discussion mailing list.

J

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ERROR installing G19 Logitech keybourd on linux mint

[Warwick Lake]

apt install
[sudo] password for whalake:
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
2 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up g15daemon (1.9.5.3-8.2ubuntu3) ...
Starting g15daemon: .../dev/input/uinput not found ...invoke-rc.d:
initscript g15daemon, action "start" failed.
dpkg: error processing package g15daemon (--configure):
 subprocess installed post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of g15macro:
 g15macro depends on g15daemon; however:
  Package g15daemon is not configured yet.

dpkg: error processing package g15macro (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 g15daemon
 g15macro
E: Sub-process /usr/bin/dpkg returned an error code (1)
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