Memory management / Memory Leak under KDE 4.2?

If I should do something a little more structured to check this out, I'm open to suggestions. I'm mostly hoping to confirm or deny this behavior with others.
For context -- I've been using GNOME with Arch on this hardware since mid-December (when I first installed Arch) until last week. Since then I've been using KDE 4.2. Prior to Arch, I'd run GNOME under several distros on this same hardware as well. During all this time I've had conky or some screenlet or whatever indication running to show me RAM usage (like a lot of us do). It's one of those things that I don't think about much, but notice when it's different than I expect.
I have 3GB RAM, and under GNOME the only time I ever saw it approach or pass 1GB used was when I knew I was doing memory intensive things (VM running + other tasks)
Under GNOME I was seeing about 300-350MB used at startup, or if I'd close down every windowed app or anything I was doing at any given point in time.
KDE 4.2 seems to start up with about 350-450, which is fine.
Here's my issue, and it's confusing to me, possibly due to my lack of understanding regarding memory management.
Over time in KDE 4.2, as reported by conky or various monitoring widgets I've had running, my memory usage will gradually creep up until just about all my RAM is shown as in use. This doesn't take long, say 1-2 hours. I also don't have to be doing anything special during that time. I haven't tested to see if it will creep up with me doing nothing, but I definitely DON'T have to do memory hungry tasks for this to happen.
Interestingly, the KDE system monitor shows a more reasonable amount, usually. Currently my widget is reporting 2162MB used, with 1640 cached, and the only thing I have open is this firefox window. (And no, firefox is not using 2GB of RAM) Checking the system monitor shows no excessive RAM consumption by any process, and .48GB used.
Now you might think "Just subtract out the cached RAM, which isn't hurting anything, and you get a number that jives with System Monitor." That's true, but I have two problems with that:
1) Why did I never see anythign like this under GNOME?
2) When my used RAM as shown by the widget gets extremely high like this, I start using *SWAP*. I can tell you for certain that my swap usage was at zero for all the time I've had this computer prior to using KDE 4.2 these last few days. Currently I'm using 64MB of swap -- not much, but why am I using any? And, I know that if I don't reboot soon, that number will also start to grow, though more slowly.
I used to run munin just for fun, maybe I should start doing that again just to get some hard data...
Any ideas?
Last edited by arch_nemesis (2009-02-03 08:30:16)

arch_nemesis wrote:
Interestingly, the KDE system monitor shows a more reasonable amount, usually. Currently my widget is reporting 2162MB used, with 1640 cached, and the only thing I have open is this firefox window. (And no, firefox is not using 2GB of RAM) Checking the system monitor shows no excessive RAM consumption by any process, and .48GB used.
Now you might think "Just subtract out the cached RAM, which isn't hurting anything, and you get a number that jives with System Monitor." That's true, but I have two problems with that:
1) Why did I never see anythign like this under GNOME?
KDE .. probably nepomuk .. is touching much more files on the hard disk than GNOME, thus making the kernel cache them (that's good).
64MB of swap is nothing, the defaults behaviour of the kernel is to swap some very rare used programs (login perhaps) in order to have more RAM free for cache. The swapiness nob controls the behaviour (http://kerneltrap.org/node/3000).
Summary: you are really only using 480MB ram

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saikalyan

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Similar flash by other with the same problem in IE:
http://www.zsg.com/
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just sending the HTTPService.
I tried loading the service in multiple ways including in AS
rather than MXML creating new instances of it each time, resetting
it, nulling it etc... but nothing prevented this memory increase.
I then tried to load the XML using different methods such as
using the URLRequest and URLLoader which again caused a memory
leak.
What still confuses me is that this leak did not exist in the
previous version and not a great deal has changed since then apart
from upgrading to Flex 3 and possibly upgrading my Flash payer
(which I believe is a possible cause)
After looking into this issue a bit more deeply, I read a few
blogs / forums and other people are experiencing the same problems
- even with a lot bigger leaks in some cases all when reloading
large sets of XML data into Flex - however, I as of yet found no
solution to this leak - people with a similar problem believe it is
not due to a memory leak more a GC error, and others pointing
towards the Flash Player itself that is leaking - I don't really
know.
Findings so far during investigation of this issue:
* App leaks for both HTTPService and ULRRequest / URLLoader
methods
* App only leaks when calling a data loader
* The size of the leak seems to depend on the size of the
XML being loaded
* The size of the leak also seems to be affected by the
applications heaviness - the greater seems to enhance the leak
An interesting factor I have noticed is that if I copy the
XML from my "myXML.cfm" that I link to in my HTTPService and copy
the contents of the file into my own XML file stored within the
Flex project root itself: ""myXML.xml"" the leak disappears... like
it seems to link when loading the XML over a network, however as my
network knowledge is not great I am not sure what to make of this -
any ideas???
Could the connection to the XML document cause leaks??? is
there anything else that could cause this leak??? have I something
in my code sample that could cause this leak??? or could any of the
other things I have mentioed cause this leak???
Any help / ideas would be greatly appreciated.
Thanks,
Jon.

I also observed heavy memory leak from using httpservice with
XML data. I am using Flex3 builder under Linux. My Flex application
polls httpservice every 10 seconds. The reply is a short XML
message less than 100 bytes. This simple polling will consume 30+
MB of memory every hour. I leave it idling for several hours and it
took 200 MB of memory. No sign of garbage collection at all.

Memory Leak issue 1.5.4.59.40-no-jre jdk1.6.0_12 jre6

Me and 2 other develops have been using SQL developer since it was created but we are getting really frustrated with the memory leaks we are experencing.
We will start up sql developer and if we just leave it alone within a couple hours it will have taken up 650Megs of ram and be completely locked up. If we are working in sql developer the time can be even faster till it lockups up. We have been experencing the issue for very long time but seems to have gotten worse in the last to updates.
I have tried to search the web and form for information to the memory problem to no avail. We are running oracle 10g and windows XP with 2gigs of ram.
Can some one point me to some information or have any idea what is going on?
Edit--
I just realized that I was not using the latest version that I have downloaded. Trying sqldeveloper-1.5.4.59.40-no-jre will advise as to results.
Edited by: ObeTheDuck on Mar 17, 2009 8:47 AM
2nd Edit--
1.5.4.59.40-no-jre has the same issue. 2hrs and it has locked up and is no longer listed as a running app and can only be seen under the process thread in windows task manager with 50% CPU use on a dual-core cpu and 626megs ram being used. Have to kill and restart ... <sigh>
Edited by: ObeTheDuck on Mar 17, 2009 10:45 AM

Thanks for the info so far....
We really do like sql developer as a tool and has been execeding helpful and useful as our development tool.
I am proud to say we have been using it since the 2nd month is was available and have been encourged and happy with most of the improvements.
I am looking forward to trying the modeling tool soon.
If I can get back to having a stable work enviorment for a work day that will be fine for now. It's just been reduced down to 2hrs which is a bit much.
Anyway...
1. We don't have any in house extentions that we need. I am speaking of the one that come bundled with the tool. Or at least I thought that they came bundled.
Several are migration tools which we don't need. One is TenTime tool which I don't think we need.
Last is the versioning extention, this sounds like something we want to use, but stability is more important at the moment. So unchecked they have all been.
2. Sue you asked about a clean install. Is that simply an unpacking a new folder copy and then not migrate settings when running?
3. I will be glad to uninstall java a switch to different version of the jdk which one is consider to be the most stable atm?
Thanks,
Obe

Memory Leak Issue With Win7 64 bit and Youtube.

I have a Win7 64 bit using IE9 with version 11.4.402.265 installed. 4 MB installed.
Whenever I go to Youtube or Liveleak, and watch videos, over time it uses up to 4gigs of my memory! Even if I close the window, it does not free up the memory until I Ctrl/Alt/Delete and shut down the window(s).
I normally only keep open 1-2 windows. Google toolbar is about the only thing installed. I can open 5 and more tabs, but as long as the site does not use flash, I don't have issues and each window usually uses under 200k memory watching them in task manager.
When I go to open and watch a youtube video, it slowly climbs to 200k and within an hour, I can be at 2 gigs or more memory and up to 4 gigs within 2 hours (or sometimes much sooner). Closing the window does not release the memory until I end task on it and then after a minute or so, the memory seems to clear and everything is back to normal.
I searched the forums and seems lots of users, report memory leaks, some using yahoo toolbar installed, which is not my case. I do use yahoo as my e-mail address, no idea if that is related or not. I had the same issue when I had the prior Flash version installed, this has been going on for months. Right now having only this window open, using 129, 192 memory. If I open one more window (using the 64 or 32 bit browser) and start youtube, the memory in that window keeps climbing about 50-100kb a second, so it adds up quickly. I have kaspersky running in the background and that is about it other then my nvida driver setup.
Really frustrating that so many people here and across the internet have reported this. I did have IE8 a few weeks ago and still had the same issue, upgraded to IE9 to see if that helped.
Interesting side note, if I pause a video, it slows way down on the memory leak, but still rises at a slower pace. I don't know if this is an IE thing or Flash. I have had this setup since 2009 and don't recall having issues with IE7. I use Youtube so much as a teaching instrument as a music teacher, so constantly have lessons going on it.
Thanks and hope someone has come up with something. I also build computers and have done some programming, so I could modify a file if needed with clear instructions.

This could be similar to bug https://bugbase.adobe.com/index.cfm?event=bug&id=3334814

Memory Leak in .swf

Memory Leak issue with CS4
Using CS4, we have a memory leak and I can not find the
source of the problem.
http://tiny.cc/O7D3e here is the
link to the testing site. If you take a look at your task manager
you will see it your RAM will continue to increase even after two
or three cycles. It does not stabilize.
We are using FlashEff | Flash Effects Component in order to
generate the smooth transitions. However, I have done some
debugging and even completely deleted the plug n from the file and
it still continually leaks memory. Does anyone have any possible
solutions or causes for this.

One idea - there is a separate stack of memory in the flash
player where loaded classes in separate application domains exist,
and these classes are not being garbage collected....however, there
is a line in adobe's documentation here:
http://livedocs.adobe.com/flash/9.0/main/wwhelp/wwhimpl/common/html/wwhelp.htm?context=Liv eDocs_Parts&file=00000327.html
under "Usage C" :
quote:
Having a new application domain also allows you to unload all
the class definitions for garbage collection, if you can ensure
that you do not continue to have references to the child SWF.
Given that, as far as I can see from this code, there is no
reference to the loaded .swf maintained....it seems to me like the
loaded data (graphical assets AND classes) should be garbage
collected - but, while you WILL see a slight drop in memory after
the removal of the SWF, the overall memory continues to increase
the more you do it. Could Adobe be mistaken?

Memory leak on SunOne Web Server 6.1 on application reload

Hi!
I am pretty sure that i have found a memory management problem in
SunOne Web Server 6.1 .
It started with an OutOfMemory error we got under heavy load . After
some profiling with Jprofiler i didn't find any memory leaks in the
application.Even under heavy load (generated by myself) i can't find
anything ,more, i can't reproduce the error! The memory usage is
about 20Mb and does not go up .
However it is pretty simple to see the following behavior:
[1] Restart the server (to have a clear picture) and wait a little for
memory usage to stabilize.
[2] In the application dir. touch .reload or one of the classes:
The memory usage goes up by another 50Mb (huge amount of mem. taking
into account the fact that it used only 20Mb under any load befor).
Do this another time and another 20Mb gone etc..
The JProfiler marks the memory used by classes . And it can be
clearly seen the GC can't release most of it.
I AM sure this is not the application that takes all the memory.
Another hint : after making the server to reload application i can see
that the number of threads ON EVERY RELOAD is going up by ~10-20
threads .The # of threads goes lower over time but not the mem usage.
My system:
Sparc Solaris 9 ,Java 1.4.2_04-b05, Sun ONE Web Server 6.1SP5
Evgeny

my guess is that - because of '.reload' , web container tries to
recompile all the classes that you use within your web application and
hence the memory growth is spiking up.What do you mean by "tries to recompile"?The classes in
Web-inf are already compiled! And i have only ~5 jsp's .
(the most part of the applic. is a complicated business logic)
If you are talking about reloading them ,yes,that's the purpose of .reload,
isn't it? :).But it seems that container uses the memory for it's own
classes: the usage of memory for my classes don't really grow
that much (if at all) after reload (according to profiler)
Also the real problem is that the memory usage grows to much for
too long (neither seen it going down) and thus ends with OutOfMemory.
if you are seeing the memory growth to be flat in stress environment,
then I am not sure that why do you think that there is a memory leak ?There is no memory leak in stress environment.
There is memory leak while reloading the application.
It is a memory hog for sure (~20-30Mb for every reload).
Memory leak?It seems that way because i can't see memory usage go
down and after a lot of reloads OutOfMemory is thrown.
also, what is jvm heap that you use ? did you try jvm tune options like -
XX:+AggressiveHeap ?256Mb.I can set it bigger ,but how do i know that it will not just delay
the problem ?
Thanks for response.
Evgeny

Memory management / Memory Leak under KDE 4.2?

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