Debian :: System Remains Sluggish After Heavy CPU Use
Jun 11, 2011
I have a problem with my Debian squeeze system. After I have run some CPU-intensive application for a while the system becomes sluggish. Ok, maybe one would expect that. But. The system remains sluggish even after that process has been killed and then top shows high cpu usage from unrelated processes and a high %sy percentage as well. I don't really know where to begin solving this problem except I've checked that this is specifically related to (at least) CPU use as opposed to heavy memory use or IO (by running an application with low mem/no io but high cpu use). I am running the latest standard kernel from squeeze, 2.6.32-5-686. Also, thing is, I remember having similar problems with other Linux distros before, where for example gzipping a large file would cause the same. I did not have similar problems on {Net,Open}BSD, so a hardware fault seems an unlikely reason to me.
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Sep 19, 2010
I am running 10.04.1 and despite everything I have tried I cannot suss out why my machine is so slow. It runs fine in the other OS installed but in Ubuntu there is a lag to every action, eg if I drag a window it follows about 3 seconds later. Basically everything is delayed for some reason. It is becoming very annoying and I am contemplating a reinstall, could someone please prevent this. The system is running on an old Athlon 2800 and I have attached a screenshot of running processes.
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Mar 11, 2010
I switched to Chrome half a year back because Firefox had become sluggish on my Linux box (both Ubuntu and OpenSuse). 6 months later and the problem remains - anyone know what is going on and any tips to improve? I still need to use Firefox occasionally for Firebug.
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Jul 26, 2011
I have been encountering lots of heavy system cpu usage. It is sporadic, last for about 10 minutes, and brings everything else to crawl (latency of even typing characters into an editor or a terminal is painfully slow). My computer is an i7 quad, and all 8 logical cores fire at near 100% during these periods. I can see the usage clearly with htop. The red bars in htop indicate system use (I have attached a screen shot for an example). However, as there is no process per se, I have no clue what is causing it.
It is something I have to fix as the computer becomes unusable periodically throughout the day.I One thing to add, I am using the computer as a ltsp server on ubuntu, attaching to it using two thin clients. There is always heavy ethernet traffic through the second ethernet card. I don't know if this is related. However, I do think all this problem began when I installed the ltsp and switched to using a thin client.
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Jul 26, 2011
My sister's laptop (toshiba satellite l550 running lucid) often runs really, really slow, even after a fresh install. Going through the gnome main menu, everything just lags by several seconds. Closing applications often takes a while, etc. I've run top and iostat to determine what the problem is and it seems to be IO-related. User processes and system processes don't take up more than a few percent, but the average load is usually over 2 even when I'm barely doing anything. Top shows that, whenever everything slows down, the 'wait' criterion is pretty high.
Now, I've also tried installing lucid to an external USB hard drive and that works fine. I'm currently running the S.M.A.R.T. diagnostic and so far I've got the attached screenshot to show. Only the criterion shown and the 'current pending sector count' are showing warnings.Any thoughts? Could the performance issue be related to the hard drive warning? I'm not planning to replace the hard drive just yet, because this laptop still has a two-year warranty.
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May 9, 2011
Here is the scenario: I load hundreds of h264/ac3 video clips from my HD video camera onto a four disk software raid stripe under Fedora 14 running the 2.6.38.3-15.rc1.fc15.x86_64 kernel. I then run a python script I've written to do batch process transcoding on the clips so that I can then edit them in cinelerra. FWIW, the transcode command is: nice ffmpeg -i infile.MTS -y -deinterlace -s hd720 -r 29.97 -acodec pcm_s16be -ar 48000 -ac 2 -vcodec mjpeg -qscale 2 out.mov. The python script batches these commands until they are all completed.
The system is capable of 16 concurrent threads and I set up 8 concurrent run queues to do the processing. Occasionally (about one in every 7 runs), the system will hard lockup during the batch. The X screens are still visible, but the mouse and keyboard are dead and the onscreen clocks freeze. The network io led still flashes but the hard disk io led is on solid at that point, leading me to theorize a kernel bug in the software raid handling. I am not able to remote log in and the system must be then hard rest with the reset button. After the reset there is no useful information in the system logs. this is a pretty uber SMP machine: two westmere quad core cpus, 24GB of ram and a four WD disk software stripe array running under the Intel ICH10 controller. I also have a RocketRaid controller installed but no disks are currently attached to it, and I disabled its bios in the setup. Additional disks under the ICH10 are an SSD system disk, and a sata insertion caddy that I usually have occupied with a disk I do backups to. So, all 6 channels on the ICH are usuallt occupied. General output from hdparm -i is:
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Oct 26, 2010
I have recently begun contributing to the Folding@Home distributed computing project. Due to oversights in the application's design and to process the most advantageous work units, I need to run this command line app through wine. The application is very CPU/RAM intensive, but it does not put much load on the hard drive. It is multi-threaded and uses up to 100% of all 6 cores in my machine. I run it with a "nice" level of 19 with hopes that it won't slow down my normal desktop use.
Here is the problem... when running this setup, my system will frequently freeze for a fraction of a second and then resume. With the more complicated work units, this can happen 1-2 times per minute. During the freeze, the mouse will stop moving, videos stop playing, music pauses, etc. The system is completely unresponsive. However, each instance only lasts for a very short time. Since this happens so often, my productivity is negatively impacted (and it's very annoying).
I previously ran the native Linux version of F@H without this problem, but that was also processing much less complicated calculations. I have tried with wine 1.2.1 and 1.3.5 with the same results. The application does not have problems running on Windows. It has been suggested that the current Linux CPU scheduler is to blame, but is there anything I can do to resolve this now or work around it?
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Feb 27, 2011
I use the Futura font as my application/desktop/titlebars font, and I think it looks beautiful. However, its bold version is much too dark for my liking and it really spoils the look of my desktop when it's used in applications (Nautilus' sidebar and Libre Office's menubar are the main offenders), and what I would much rather is if the system would use Futura's heavy weight option instead of bold, but after searching gconf and for configuration files I can't work out where or how I would do this.
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Aug 11, 2010
Kernel 2.6.21.5, GNU (Slackware 12.0).
The following are two extracts from /var/log/messages.
Code:
Aug 10 17:29:52 darkstar sshd[11675]: reverse mapping checking getaddrinfo for 116.214.25
-66.del.tulipconnect.com [116.214.25.66] failed - POSSIBLE BREAK-IN ATTEMPT!
Aug 10 17:29:52 darkstar sshd[11675]: Invalid user plcmspip from 116.214.25.66
Aug 10 17:29:52 darkstar sshd[11675]: Failed password for invalid user plcmspip from 116.
214.25.66 port 40032 ssh2
[Code]...
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Dec 22, 2009
I just recently purchased a DELL PowerEdge 2850 and have tried installing CentOS 5.4 on it. After the install completes and it does a first boot I get the following error on the DELL console: PROC 1ERROR, PROC 2ERROR E07F0. The monitor remains black and the system hangs. Just out of curiosity I installed Fedora 11 on it to see if it was a hardware problem. Fedora installed and booted no problem. I rebooted with Fedora installed several times and left it running for 24 hours. Everything is working great. Is there something I am missing in the CentOS 5.4 install?
Below is the Hardware Config:
Dell PowerEdge 2850
PERC 4eDi RAID Controller
8GB PC-5300 ECC Memory
2 Intel Xeon CPU Dual Core 2.8GHz 800FSB 4MB Cache - SL8MA
ATI Radeon 7000 Video Card
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May 17, 2011
This is my first day with Debian, I have used other distros, and am a long time linux user. My HP D 1600 series is recognized, but when I try to print a test msg. it says sent, but the printer remains idle. I have tried everything I know. When I run the trouble shooter I get this. /// /usr/lib/cups/backend/hp failed////
In the past when having a printer problem I have installed HPLIP-gui and removed the printer then re-installed it. That has not worked and I cannot even remove the printer.
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Dec 2, 2009
If I remain 'connected' (with the KVM) to the linux machine the gnome screen saver cuts in and the system remains 'as is' until 'woken up' with the mouse or keyboard. However, if I switch to another machine using the KVM, within a short time (maybe even minute or two) the linux machine goes dead. Now it has not crashed, as I can log in from a remote machine and do anything I need from a terminal, but the machine seems not to respond. I can't even use ctrl-alt-fn to switch to a console screen.
I initially tried entering telinit 3 from a remote machine but it made no apparent difference. However, if after telinit 3 I then killed the Xorg process and later issued a telinit 5 the X server restarted, but with a curious black 'notch' at the top of the screen. I am using an NVIDIA GeForce 7600 GS graphics card. I am now adding the backtrace from Xorg.0.log. It seems that when the KVM switches to another machine for more than a very short time the X server crashes.
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Oct 5, 2010
I'm having a problem with krusader. When I open and close it, it remains with a sleep status. This can be verified by the system monitor and by the "ps aux". The krusader only go away if I use killall. This is occurring in more than one machine. I'm using squeeze gnome 64 bits.
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Feb 24, 2010
Is there a way to switch a internal card slot from /dev/mmcblk0** to /dev/sd** ? I'm backing up (via rsync) an ebook directory (1.9gb) to sd card and get massive i/o errors, card turning read-only,etc. This is via a built-in slot on a toshiba laptop. When I use a card reader, the card attaches to /dev/sdd1 and all is fine.
This is a new Sid install. The laptop's card slot worked fine under Ubuntu 9.04 and still works if the amounts of data are small. All I can figure is that the mmcblk device dies under a heavy load...
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Dec 20, 2010
So I'm pretty awful at keeping Debian up to date, I guess. I'm using cron-apt to fetch updates every night, then apply them whenever I get around to it. Well, I neglected that last part for a month or two, and after some routine downtime to clear the case of dust, I decided it was time to upgrade. So I ran the command, everything checked out fine, and I was on my merry way. Until a half-hour ago when I accidentally shutdown the computer (I use the same zsh prompt on each computer, so I got them confused.) I turned it back on, only to be greeted with a black screen after all the services started up.
Everything works: ircd, MPD, etc. EXCEPT, of course, X. At first I thought the update broke SLIM, but after checking htop and doing a killall slim, it doesn't appear to be running (the screen remains black.) I hit Control-Alt-f2 to get to get back to a terminal, then tried doing startx, which freezes the computer entirely. All the network services stop, I can't SSH in, etc. It's dead. If I'm not mistaken, Xorg.0.log should say something, but I'm not a huge expert on it. The last line isn't an error, I can tell you that. So what's the deal here? apt-get remove xorg and start over?
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Feb 20, 2011
I recently came to Debian. As I have an ati card, I tried the proprietary drivers first, but then came back to radeon (open-source). In the process, I think I may have broke my xorg.conf . Sometimes, when the monitor goes into sleep mode, when I came back, the screen remains black (sometimes I see just the cursor).
Here is my xorg.conf
# NOXORGCONFEXISTED: No X.org configuration file existed when this backup was created.
Also, I have lots of backups in my X11 folder, like xorg.conf.fglrx-3, xorg.conf.original-1, or backup.xorg.conf. Is it safe to remove them? What should I do about the main xorg.conf?
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Sep 5, 2015
I installed Debian 8.1 with iceweasel 38.2.1esr-1~deb8u1
Whenever I want to open a youtube fragment I do hear the sound but the screen just remains green. I already googled the issue but found no solution that works.
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Dec 27, 2010
Things beyond my control are causing me to rush a bit in getting the website moved. I'm working hard to try and get it done, but something else has come up that SSL Certificate.I know that our website's "basket" area is protected by an SSL certificate to ensure customer information, especially credit info, is secure. With the move to Amazon's service, it looks like I may need to create our own self-signed SSL certificate to ensure the basket area remains secure.
I have found guides that walk through how to make one yourself and configuring apache to allow it, but something else has come to mind. The guides I found don't really indicate where the SSL certificate goes afterwards, and also doesn't suggest which sections should be governed by the certificate (as only the basket section uses it, not anything else). How would I find out that information?
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Jul 11, 2015
I'm having some problems with banshee that started about 6 months ago. Banshee remains idle and does not play any type of music file. I've tried installing and selectively installing Gstreamer codecs with no success. I'm running stretch.
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Aug 20, 2010
after a successful installation of the latest debian testing amd64 kde CD-1 iso, the monitor shuts off about 2 seconds after passing the grub2 menu while computer remains powered.
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Apr 5, 2011
I was using opensuse kde 11.3 for almost one year. My system is a four-core system and so far was really fast. After upgrading from 11.3 to 11.4 I have noticed that kde(?) is running slow. I can pinpoint exactly the source of the problem but just a few examples.
1. Dolphin takes so much time to load (15 seconds)
2. When I try to do something inside dolphin (like Edit->copy) can take up to 15 seconds to see the menu to appear.
3. Double clicking inside a catalog can take up to 5 seconds
I have same kind of problems with Gwenview. I can not say precisely blame kde, dolphin or gwenview.
I would like to ask your help how can I find what's the problem (any cli command, any log file to check?)
I have updates to latest opensuse 11.4 by using the documentation I found in official opensuse forumes. (Changed the repositories from 11.3 to 11.4)
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Jun 9, 2010
Having woken her up, she is often very bleary eyed with no energy and little movement. It takes her quite a time to be fully functional. Are there any settings that reduce the time between waking up and full efficiency?
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Jul 23, 2010
I've been using Ubuntu 10.4 for nearly a month now and am very happy with it, especially the ability to add and upgrade programmes which up till now was a nightmare with worries about dependencies etc. I do have one major gripe, and that is Firefox 3.6.3. I gather others have had the same problem. At start-up Firefox works fine, but after about 12 hours, it becomes so sluggish as to be unusable. Web pages that would take seconds to download now take minutes and the hard drive starts churning and grinding away. The whole system becomes slow and sluggish, and when I do a "top", Firefox is right at the top. Very often the only way to get out of this is to physically turn the machine off and then back on again, which I know is a bad thing.
Its not as if I am overloading Ubuntu. The last time I had to switch the PC off, all I had running were 2 terminals, a calculator and gedit. Firefox was running about 10 tabs. Even when I do a kill -9 pid on firefox and then restart it, within minutes, the system is grinding away and slowing down. The only way to remedy this is to switch the PC off. Someone else who had this problem says its as is Firefox is getting tired and needs to refresh itself completely. Is there any solution to this problem as I gather others have been experiencing it.
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Jul 9, 2010
Down graded from ubuntu 10 because of phy0 using to much CPU power for no reason machine is sluggish, now it has become worst using Ubuntu 9.10.
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Mar 14, 2010
I recently noticed that the menus and dropdowns in Firefox 3.6 were *extremely* sluggish on my laptop running Slackware64-current. For example, if I click on "File..." or one of the folders on my quicklinks toolbar, the menus take about a second to appear. No other apps are affected and surfing is as fast as usual.I'm running Slackware64-current on a Fujitsu Lifebook V700. I typically use the Xfce window manager, but was able to repeat the problem in Blackbox.
I uninstalled the Firefox 3.6 package from -current and reinstalled the Firefox 3.5.2 package from the slacware64-13 tree and it works fine.I've been scanning the net for others having this same problem and to my utter shock I can't seem to find anyone else reporting remotely the same problem!I'm fine using Firefox 3.5.2 indefinitely, but it's driving me nuts that I can't figure out the source of this problem!
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Sep 26, 2010
Click on scrollbar. Drag down. Watch text crawl by in fits and starts. Don't even think about using the scroll wheel. And this, on a one page RTF document. With no special characters or images or anything.
I tried the instruction here: [URL] It did nothing. How can I make Abiword usable? It doesn't have to be lightning fast, all I want is for it to scroll at the same speed and with the same responsiveness as all my other applications.
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Aug 3, 2010
These are the problems that I have observed:
1. Slow responding to clicks - Test in Mouse Preferences demonstrates it readily; the light bulb does not always light up on first click.
2. Activation of alternate window takes more than one click
3. Click on scrollbar's botton arrow remains activate and continues to move even when mouse is lifted.
4. Scrollbar randomly remains active after click on scrollbar's middle (floating) button even if mouse is move to the window area.
5. After a click on icon or link, often mouse icon changes to a hand icon and the icon moves with the mouse. Difficulty unloading this action - takes several clicks.
6. Highlighting is difficult to cancel once it starts.
This problems started with an update in 9.10 to X (which I was trying). Make the system very unusable.
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Jul 20, 2010
I have a computer on my network being extremely sluggish and I cannot find the reason why. I can ping and the response time is decent enough at 0.137ms up until something that requires network access is run(cvs, SSH, ls on mounted drives). At that point the ping jumps up to 6000ms, sometimes up to 12000ms.
I have looked through /var/log/messages and found nothing suspicious and I have not seen any problems on other networked computers when accessing the shares. Disk usage on this computer is fine(470GB free) and memory is fine as well(up to 10GB free). The computer is on CentOS 5.3.
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Jan 7, 2010
I virtualized XP, and it's rather slow. I allocated 1.5 gb of ram, dynamically expanding storage. When I go to system in control panel, it says my processor is 880 mhz fast. I have an amd64 2.0 dual core.
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Oct 24, 2010
After first installing Fedora on my computer, I was having a problem with my programs hanging for about 10-20 seconds, and then starting working again. After a while I discovered that every time it happened, there where some disk activity, and when the disk activity stopped, the programs started working again. The problem also occurred, when I was copying large files. Then the programs would hang until the copy was finished.After some googling around I tried to change the scheduler for SDA from cfq ro deadline, which seemed to solve the problem.
However the problem still seems to occur, if I do something that requires heavy network activity. If I copy a large file from one computer to another or download something using Vuze, all programs becomes unusable until network activity stops again. have 2 computers, which both seems to have the same problem (AMD X2 3800+ and Intel Core I5 750). They are running Fedora 12 and 13 both 64 bit. Both are using Asus motherboards with onboard LAN
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