Ubuntu :: 9.10 - High IOWait And System Slow Down
Jan 5, 2010
I've been having a problem in Ubuntu 9.10 recently where starting about 2 minutes after startup my computer slows down and becomes unresponsive. I believe the problem is associated with a high IOWait because I have the system monitor applet on my Gnome Panel and it displays 100% IOWait every time my system starts to slow down.
I have tried booting into other kernel version and the problem persists. I don't really know what IOWait is or how to diagnose this problem further. I've looked around online and it seems like you have to find a specific process that is causing the IOWait, but I don't understand how to go about doing that.
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Jan 5, 2010
I've been having a problem in Ubuntu 9.10 recently where starting about 2 minutes after startup my computer slows down and becomes unresponsive. I believe the problem is associated with a high IOWait because I have the system monitor applet on my Gnome Panel and it displays 100% IOWait every time my system starts to slow down. I have tried booting into other kernel version and the problem persists. I don't really know what IOWait is or how to diagnose this problem further. I've looked around online and it seems like you have to find a specific process that is causing the IOWait, but I don't understand how to go about doing that.
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Jul 24, 2011
I run a website that a very steady flow of traffic and Im seeing recent issues that I just dont like. Server is 10.04.2 on a supermicro i7-950/6gb RAM with two 500gb Samsung F3 drives in a software RAID1 (1x5400, 1x7200) and for several weeks, its been running very well. Recently, Im seeing the server hang for 5-20 seconds. IOwait goes through the roof, nothing can write to the disk. Apache logs stop, redis fails to rebuild caches, mysql errors and then it continues and moves back to normal operation
/ is ext4, the kernel was 2.6.32-server-x64 but since updating to 2.6.38-server-x64, the issue has dropped from maybe once per 10 minutes to once per 15 minutes. 3 IOstat copy/pastes show this when it hangs.
Code:
Total DISK READ: 0.00 B/s | Total DISK WRITE: 0.00 B/s
TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND
[code]...
No smart errors or smart diags show any issues with any of the disks and kernel.log shows near nothing other than a process hang, 120 seconds about 5 days ago.
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Jun 15, 2010
I've been using Ubuntu consistently for about three days now. I really, really love the interface and how everything works and all that, but I've been having a couple of weird problems with speed.
Graphics things seem to work really well. When I go into the overview of all my workspaces, it's instant and looks great. The problem is when I open and use some applications.
For example, when I open up the software center, it takes longer than it did the first time to start up. Also, when I drag windows off from being maximized, it takes literally about five seconds for it to show up as being dragged around by my mouse.
When I look at the system monitor, about 20% of my CPU cores are constantly being used. That's 20% each. I have a 3-core CPU, could that be the problem?
Another example: when I went to ..... just now, it would take a second for any volume changes in the video to register.
And I also have smooth scrolling in firefox, but it's very unresponsive now. It's slow as all hell. Even notifications are showing up more slowly.
So, what's the deal? What could I have done wrong?
CPU: AMD Phenom II X3 2.8Ghz
GPU: ATI Radeon HD 4860 1gb
RAM: 4gb
One more thing: I have really bad screen tearing when I try to move windows around, as if there isn't any vsync on. Where can I turn it on or fix this?
I'm still pretty new to Ubuntu and Linux, but I'm an advanced computer user. Since I feel linux is killing my CPU I think I'm going to boot back into Windows 7 for now, but if I can fix this problem I think I want to keep Ubuntu as my main OS after this, having Windows for games, unless I can get Wine to work right with them.
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Nov 30, 2010
I am a newbie regarding the Slackware, though i have some millage on Ubuntu. Anyway, i have Slackware 13.1 and slapt-get is really, really slow when downloading packages, even when i do slapt-get -update the slowness is just killing me
The second question is somewhat different. How can i view dependencies on which a particular application is depended?
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Apr 22, 2010
I have problems with my network speed when i ping my proxy server I end up getting a high packet loss generally more than 30%.I have tried to use various network monitoring softwares like etherape, wireshark, tcpdump but I am not able to get to the bottom of the problem.basically I am trying to find out where the lost packets are going.
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Dec 11, 2009
I've just noticed that unrar is suddenly taking minutes to extract instead of seconds.
I can remember if its recently been updated, but I've uninstalled and reinstalled it and the version is: unrar.x86_64 0:3.7.8-3.fc10
I've found a few Ubuntu posts about it on Google, but in true Ubuntu fashion nobody has any answers!
What's odd is that when I unrar a file from (Nautilus or "unrar x *.rar") it takes say 4mins, then if I do it again it takes 15secs, like as if its caching somewhere.
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Nov 9, 2010
I am using Redhat linux 9.0 and using squid proxy server.My problem is tht i my squid server is responsing very slowing. whenevr i try to open sites the site starts to open after 3 or 4 seconds and often squid does not open the complete site. its stop the site in middle. My squid Configurtion is below. Is there any need to tune the system parameters Like from 'SYSCTL.conf' for better diskd performence or another problem. at this time i am using default system parameters. Please help me in detail what is the reason of squid slow performence if there ia a need of any system tuning please tell me in detail. I am very thankfull to you.I am really worried about slow performence of the squid. I also try to offline_mode on but the same problem. code...
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Nov 16, 2010
I have CentOS 5.5 x86_64 with Apache, php and mysql.
I have just installed OTRS (helpdesk - trouble ticket system) on that server and no users.
This system works with perl, apache and mysql.
I notice that is slow to respond and at times unresponsive the apache welcome page. code...
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May 2, 2010
I'm having issues playing HD videos ( some with 720p level, much more apparent with 1080p level one) The video appears to slow then becomes choppy, becoming de synced from the audio that carries on as normal. This occurs with both VLC player and XBMC, though the latter is better. My specs: Fedora 12 3.2 Ghz P4 processor 1Gig ram Radeon 9800 xt gfx card (I couldn't get the 9.3 ati driver to work)
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Jan 7, 2010
So I just reinstalled OpenSUSE 11.2 and I went from having 20-30 mbps speed to and from my 1 tb usb ntfs external hard drive to having about 1 mbps transfer speeds now. Is there any suggestions for how I can fix this? I know it can go faster, I just need to figure out how. and would setting acpi=off at boot affect this?
Opensuse 11.2
KDE 4.3
64 bit
EXT4 main disk
NTFS external
fdisk -l code...
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Sep 4, 2010
My problem is extremely slow write on hard disk and 100% cpu usage and it happens when I want to write something on the hard derive not any other external derive.
Tried a fresh ubuntu install. No change. I am not even sure if it is a software or hardware problem.
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Nov 22, 2010
I was browsing my folder with lots of images, after finished i close nautilus and i notice that my computer became slow, so i'll check it with system monitor and had found that nautilus are using almost 100mb of ram (opening 4 tabs). I'm not sure if this was normal or not because i try to reopen the same folder with pcmanfm and it only consumes less than 20mb of ram (opening 4 tabs).
here's the screenshot from system monitor .
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Apr 17, 2011
Whenever I transfer a movie into my 16GB USB flash disk, my whole system becomes windows-like and unusable!
When i drag the file(s) into the USB disk folder, it starts out fine and pretty darn fast (25mb/sec) then slowly decreases until it's unbearably slow (3m/sec) and as a side effect my whole system starts deteriorating. I basically have to wait for the file to finish transferring before i can use my desktop again!
This has been happening with every version since Karmic (all 64bit)- I put up with it because I don't use the USB stick that much.. but lately it's been my go to source for transfering large files to/from work.
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May 28, 2011
Most of the time when using USB flash drives under Linux, the OS will lock up at 100% IOWAIT, with a load average of 12-18. Even my music stutters and stops. Using USB drives makes my Core I7 3.0GHz HyperThreaded act like a Pentium 2 running Vista. It's embarrassing. A client asks for a file, and it takes me 2 hours to copy it. This is a deal breaker. I've been trying to find a solution. If I can't, I'm sorry to say I'll be leaving Linux for something that can use USB drives. I've been using Ubuntu for 4 years, I'd hate to leave. Don't take that as threat, just a stark fact based on business decisions.
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Oct 27, 2010
Can anyone explain the difference between IOWAIT%/IDLE%/LOAD AVG? We have a 3 servers (oracle rac) attached to a SAN. When we added another CPU to our 3rd server, the IOWAIT across the oracle rac dropped a lot. We used to get pretty high IOWAIT % before. So I don't really understand how the extra CPU could do this. I thought the IOWAIT % is high because the server is waiting for the SAN, so I thought the SAN was the bottleneck. So I don't really understand the difference between the 3 things (iowait, idle and load avg).
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Jul 2, 2010
i've been using 10.04 since may and it's been good to me thus far. BUT recently, i've been experiencing unusually high system loads. it will happen at random it seems. for instance, it just did it a few minutes ago when i turned on and mounted a external firewire drive. i also had ogmrip open, but NOT running as well as transmission and pidgin. yesterday, i was encoding a rather big movie with ogmrip and around 25%, the system load quickly increased to 10 and held there until i force quit ogmrip. it went back to normal after the force quit.
a previous night, i was installing the popular ubuntu themes via the terminal. at the same time, i was also using ogmrip and the system load shot up during the download/install and held there the rest of the night. sooo...unless it's somehow related to ogmrip i don't know what's going on. it even did it when ogmrip WAS NOT processing any video, just simply open.
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May 1, 2011
I have been using ubuntu for 4 years now on my decent laptop with 2 Gb RAM, dual core centrino, etc etc. Yet, in all those years I have been using this superior OS, I still have to do hard shutdowns because some program runs wild. I have lately 2 scenarios where I have to interfere with the process:
1: amarok crashes and leaves the python script for the gnome shortcut keys running at 100% CPU. Or: thunderbird-bin keeps running after apparently clean close of Thunderbird. That's not really bothering me, I just kill both processes.
The bigger problem is scenario 2: 2: VLC starts eating all my RAM (for no reason), my SWAP starts filling and my computer becomes unusable for 10 minutes. Or: my matlab script is too big and eats up too much RAM -> same. Note: I have nothing against SWAP because at many other times it's very useful
These are stupid and annoying problems where there is an easy solution:
1) automatically kill the stupid process that runs at 100% CPU
2) automatically kill the stupid process that eats up all my RAM
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Nov 11, 2009
I have a server running samba process and there are about 70 samba users connected at a time. The system has 4Gb of memory and it seems each samba process is utilizing only 3352Kb of memory.
When I run the command
pmap -d (pid of samba)
It gives as:
b7ffa000 4 rw-s- 0000000000000000 0fd:00003 messages.tdb
bfe46000 1768 rw--- 00000000bfe46000 000:00000 [ stack ]
ffffe000 4 r-x-- 0000000000000000 000:00000 [ anon ]
mapped: 33384K writeable/private: 3352K shared: 20504K
But when I run the top command, it results as below:
Tasks: 163 total, 1 running, 162 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.9% us, 4.9% sy, 0.0% ni, 93.3% id, 0.8% wa, 0.2% hi, 0.0% si
Mem: 3895444k total, 3163192k used, 732252k free, 352344k buffers
Swap: 2097144k total, 208k used, 2096936k free, 2487636k cached
Why could the system be utilizing such high memory? By the way, the server is not running other processes. The samba version running in it is 3.0.33-0.17.
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Jul 19, 2010
Basically I have a machine with 16GB of RAM and have just discovered that using all of it can crash the whole system over one process. How could I run a process on the system in such a way that if more than 90% of system memory is used, the process immediately crashes?
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May 4, 2011
We are using wordpress with MYSQL. Both the app and DB server are different with 6CPU and 6GB RAM and 32bit processor. We had noticed recently that mysqld process is taking too much of system usage- ranging upto 100% of CPU utilization while having the load of 1200-1600 concurrent users.
Pasting d my.cnf file-
# The following options will be passed to all MySQL clients
[client]
port= 3306
[code]....
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Oct 31, 2010
After changing servers and moving things around, I have one system which serves the /home directories, and for some reason, it is extremely slow. I've looked for duplicate IPs, signs of a HW problem, etc. and cannot figure out why the system is running with a high load, high iowaits, and low responsiveness. The servers and clients are slackware 12.2 and 13.1 respectively.
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Apr 10, 2011
After installing reddit, my ubuntu stuck with high cpu usage and system load.
Code:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
8634 reddit 20 0 12180 8960 2572 R 12.1 0.9 0:00.51 paster
8611 root 20 0 23756 17m 3816 R 11.8 1.7 0:00.99 paster
8613 reddit 20 0 23200 17m 3908 R 11.8 1.7 0:00.96 paster
8617 reddit 20 0 15072 11m 2688 R 11.8 1.1 0:00.69 paster
8620 reddit 20 0 14372 10m 2680 R 11.8 1.1 0:00.66 paster
[Code]...
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Dec 23, 2010
Where does one look in terms of diagnostics after a system lockup and hard reset? For example, one of my computers, running Fedora 14 i686, has taken to locking up quite a bit lately. My only way out is a hard reset. Now, once the thing is booted back up I'd like to try to figure out where the problem lies. Where do I look? Will any of the log files reveal anything relevant to me? If so, what sort of things would I be looking for. Keywords?
This same box also locked up when I had Fedora 14 x86_64 installed. I had read that there were some issues with the newer 64 bit kernels that were causing lockups and / or extremely high loads. This is why I switched back to the 32 bit version, 2 days ago to be exact. The box gets little use. It's a toy really and not my main "daily use" computer. It is, however, running folding@home. Maybe that's where the problem is. About 15 minutes ago I called home and had my wife reset the box, then I logged in from work and stopped the folding service. I'll have to see if it locks up without folding running. Folding was running on this box when I had the 64 bit version installed also.
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Feb 18, 2011
I have just started to have a problem with Xorg it is always using at least 30% of my CPU, and the whole system does not run smooth so if I play a video it does not run smooth, it judders, also even if I drag an icon it judders across the screen. Im running Ubuntu 10.10 2.6.35-25-generic x86_64 VGA compatible controller: nVidia Corporation G98M [GeForce G105M] (rev a2)
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Oct 13, 2010
I need to test a code that needs to have high DiskIO and DiskBisy in a Linux environment. Is there any way that i can use to test this urgent need of mine.
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Apr 24, 2010
I'm running Slackware 13 with a custom kernel based off of 2.6.32.3. I tend to leave my system on 24/7, as well as my web browser. Originally it was Firefox and now it is Google's Chrome. Usually about a day of leaving the web browser open my HD activity spikes so high that I can barely do anything on the system until I kill the web browser. This has been happening with both Firefox AND Chrome! As soon as the browser processes are killed, the system returns back to normal.
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Mar 24, 2011
I used Ubuntu 10.10 (64 bit) on IMac i7. As far as, I remember, after installing Pulse-Audio Equalizer, for each restart of the system, after login screen, system sets volume to maximum value. What can I do?
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Mar 23, 2010
I am kinda stuck while providing solution for the above problem. I have achieved the fail over using keepalived but not sure how can we replicate the data from one server to other seamlessly and have them in sync with each other. My prime requirement for this project is end user should not notice the fail over and replicated copy of data should be available on the secondary as well.
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Jan 17, 2010
My mom's Ubuntu machine has been rather strange the last day or so. It takes a while to turn on, delaying apparently at loading "powernowd".
GDM seems to load fine, but then logging in to Gnome takes a long time. The panels ususally crash, as well as the desktop, but eventually everything loads again.
Most programs take a long time to load; also, "sudo" takes a long time to request a password, but after that the "sudoed" command runs normally.
Gksudo never seems to show up, so I can only access programs like "Software Sources" via terminal (e.g. sudo program).
Strangely, Gnome System Monitor says the processor and memory are not completly full.
Does anyone know what this is? Are there any commands I can run to diagnose it?
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