Ubuntu :: "nice" Causing Increased CPU Time Even In The Absence Of A Load
Sep 10, 2010
I've just noticed that "nicing" long running computationally intensive, I/O unintensive, single-threaded executables on my system increases the CPU run time of those executables (as reported by /usr/bin/time as well as by wall clock) by a factor of 2-3 even in the absence of any load, i.e., "top" tells me that my program is getting 100% of a CPU. For example:
%coot 248: /usr/bin/time -p ./a.out > out
real 97.47
user 85.64
[code]....
My system is running Ubuntu 7.10. If I run the same executable on two other machines I have access to -- one running Fedora 5 and the other Ubuntu 9.10 -- I don't see any discrepancy between the runtimes using nice and not using nice.
This behavior is executable independent, compiler dependent, and language dependent -- I'm seeing it across the board. I'm assuming I've somehow configured my system to behave this way, but I have no idea what I may have done. Also, this was the first time I'd ever done timing runs with "nice" (actually, "at"), so I'm not sure how long my system's been configured (if configured is the right word) this way.
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Jul 22, 2011
I am running 11.04. After an update about a week and a half ago, the time to wake from suspend increased from about 3 seconds to well over 40 seconds. It now, sometimes, takes me longer to wake from suspend than a normal boot takes. Has anyone else encountered this problem/found a fix or workaround?
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Mar 30, 2011
My hardware:
AMD Athlon X2 4800+ (2,5 GHz) + 2 GB DDR2 memory
MSI K9N V2 (nforce 520)
SAMSUNG HD250HJ (SATA, 250 GB)
I'm using OpenSUSE 11.2 with all the released updates are installed. I've got an Windows Xp SP3 on the same hard drive and it's works fine. S.M.A.R.T. says the hdd is 100%. A few days ago I realized that the boot time increased and the hard drive operations takes way too much time. So currently the boot sequence takes 11-14 minutes.
I've already tried to solve this problem but no effect:
1.) cleaned up the root directory to create more free space
2.) plugged the sata cable to another port
3.) changed from AHCI to IDE and reverse in BIOS settings
4.) added ahci, sata_nv into the /etc/sysconfig/kernel file and created a new initrd
5.) searched for problems in the syslog
Just to imagine how slow is currently the system/hdd:
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Feb 10, 2010
my server and it had a load of 60 so i immediately took down apache and the load went back down to 0 in a few mins and every time i put it back on the cpu usage on both cores immediately goes to 100% and the load goes up to 20 in just 60 seconds until i take apache down again?
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Sep 12, 2011
I am running a CentOS 5.6 32 bit installation under VMWare ESXi and have been experiencing some very high load values from time to time. The server is running multiple installations of gameservers, and the load fluctuates from around 1 to 9, with more or less the same amount of players playing (give or take 5-10 of a possible 80). I've been running DStat with almost all possible metrics, and, except for the large fluctuations in load, nothing else out of the ordinary seems to happen when load is rising. (Log data can be provided, if anyone wants to see it). Disk IO, Network throughput, memory consumption, CPU usage, process count, all stay at the same levels when the load is 1 as when it is 9. How I can begin to troubleshoot this, and find out why the load goes to such high values?
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Aug 14, 2010
Something is running my memory up and causing my load to crash my forum. I keep noticing this error and have no clue really how to go about fixing it.
Quote:
%CPU PID USER COMMAND
1.2 2978 mysql /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --log-error=/var/lib/mysql/server.forumnameremoved.com.err --pid-file=/var/lib/mysql/server.forumnameremoved.com.pid
Could this be causing my CPU to run high? How would I go about fixing an error like this or is it even doable?
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May 2, 2011
Whenever someone copies a data Our system get very slow. Load average of system starts increasing. How would i find which process is causing the same. I have tried following top 10 CPU utilizing process command but it didn't help much.
Code:
ps -auxf | sort -nr -k 3 | head -10
My distribution detail.
Code:
# lsb_release -a
LSB Version: :core-3.1-ia32:core-3.1-noarch:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID: EnterpriseEnterpriseServer
[code]....
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Mar 17, 2010
I'm using centos 5, kernel 2.6.18-164.11.1.el5I have occasional server network problems (the NIC driver will basically crash/restart causing no connectivity for a period of time) due to the marvell sky2 NIC driver being a problem, as discussed here: This essentially means the server is unreliable when under any kind of reasonable load, to put it mildly.Worse still, the driver problem has not been resolved in 2.6.18.x - but it seems to have been resolved in the latest Linux kernels.I really don't want to compile the kernel from source, etc, but it looks like I may have no choice.Is there a repo which has a pre-compiled 2.6.20+ or 2.6.30+ kernel which I can use,
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Dec 28, 2010
I am using Kubuntu 10.04 (+KDS 4) in a virtual machine (64 bit). Kubuntu 10.04 runs fine, but does not have an xorg.conf file anymore where I can set "backingstore true". How do I configure (which system file to edit?) my machine so that backingstore works in absence of an xorg.conf?
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Oct 13, 2009
I am running Centos 5.3. I ran no updates, performed no installs, nor changed any configuration immediately prior to this issue. My problem is this: when I run the command startx (default runlevel 3), it is a long time (5-10 minutes) before Gnome startx, and once it does start applications will not run. Also, when I try to use sudo (from any environment, even ssh), it is a long time (5-10) before the command is executed.
I cannot say for sure, but it seems like this is an intermittent problem. Sometimes X takes a long time to start, but once it starts it will launch programs. Sometimes X takes a long time to launch, but once it starts it will only launch certain programs. Though presently X always takes a long time to start, and I cannot successfully launch any programs.
A while back a had a similar problem to this (x taking long time to start, sudo taking long time to execute) and it ended up being a DNS problem. Unfortunately, I cannot remember exactly what it was and I stupidly did not document it. Maybe this is also DNS related, I don't know.
I don't know what log files to look at for problems with X, Gnome, and sudo taking a long time to start.
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May 3, 2010
in ubuntu 10.04 After logging in t All I had was the wallpaper & my widgets for around a minute, and then the usual upper and lower panels appeared.. didnt had this problem in 9.10
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Jan 29, 2010
I have been using Karmic as a tool to extract important data from Windows Operating Systems where say viruses have necessitated a complete reinstall. I run the Karmic install disk and use the 'try before installing'option. It works well and I am able to 'rescue' anything I want by saving to a USB drive.Problem is that Karmic does take a relatively long time to load on a 'slow' PC.Does anyone have any suggestions on a 'slimmed down' Ubuntu that could be used in the same way which will load up quickly ?In most circumstances all I want to do is mount the C Drive of the stuffed PC and copy files to an external USB drive.
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Sep 19, 2010
I'm using wine to run steam and play Star Wars Battlefront 2. The reason I'm doing this is because it actually is bugged and doesn't work with XP like its supposed to, but surprise, it works in linux! It works flawless and beautifully with one exception. When loading missions the game takes 5-10 min to load. I have a great PC when compared to the days this game was written in. AMD dual-core processor with an Nvidia 9800 series video card etc. but it just takes a long time to load the maps and mission parameters I guess. Any one know where the information might be getting hung up and how I might be able to streamline it a little?
I know I've seen a few posts about wine and people usually remind the posters that this is an ubuntu forum, not a wine forum, but I was hoping someone with more computer knowledge than me might be able to give me a simple reason for this issue. Feel free to point me some where else to post about this.
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Aug 1, 2011
I have an Ubuntu/Win7 dual boot system with GRUB as my default bootloader, and I am often distracted by other things when I boot up my PC. Is there any way I can stop GRUB from loading linux automatically after it times out? I would prefer if it never timed out, and I could eternally have the OS selection on the screen until I decide to select an OS.Have been reading the GNU Grub Manual, but I can't make heads or tails of some of the more technical stuff yet and I do not know enough about Terminal to know all of the commands they are throwing at me.
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Jun 1, 2010
I installed ubuntu 10.04. After logging in,it's taking time to load the gnome menus.
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Mar 14, 2010
I followed the instructions that came with the 802 .11 Linux STA driver and was able to initialize my card and connect to a protected network! The instructions also tell me how to load the drivers at boot time, but I get an error when I try to run
Code:
# sh: for i in `find /lib /var -name wl.ko`; do mv $i ${i}.orig; done
The message returned is
Code:
bash: syntax error near unexpected token `do'
Upon restarting, my wireless is no longer active. My card is Broadcom Corporation BCM4322 802.11a/b/g/n Wireless LAN Controller (rev 01)
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Aug 23, 2010
I am completely stumped. Found my web server (lighttpd) unresponsive this morning and had to hard cycle it. After some cleaning up, all was happy. However, after about an hour of handling a decent amount of web traffic, time freezes as far as the web server is concerned. I've got an hour of access.log data with the following date: [23/Aug/2010:20:42:58 -0500]
It never changes. The load average now reads 0.00 0.00 0.00 (which is totally inaccurate). And I am not able to successfully log in remotely. I have taken the server down 3 or 4 times today and after an hour or so of functioning normally, this is what happens. Additionally, the local time is now off by 30 minutes.Trying to force with ntpdate does nothing (or, at the very least, sets it to the same incorrect time)
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Jun 21, 2009
configured /etc/sysconfig/vncserver, used vncpasswd as the user im trying to log in as to set passwd, disabled firewalls, set chkconfig --add vncserver but still whenever i try to connect to the vnc server I get "unable to connect to host: Connection refused (10061)". If I run the "vncserver" command as my normal user, I can connect fine then. This really wearing on me, any help is greatly appreciated. It is weird if I try to stop vncserver it says [ok] and then if I try to stop again it says [Failed] but if I check the status of vncserver it says Xvnc is running..
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Mar 22, 2011
I have just recently found I have a problem under SUSE 10.3. History, I had my PC, an IBM Power Centre box with 4g ram and 2 hard-drives (80gb and 1Tb) fail to reboot after a power drop. Got an error message about the 80gb H/D losing some information. I was able tofix the issues by using "fsck". The PC was able to restart after this, and seemed to be working well.
However in the last couple of days I noiticed that the time was incorrect, it seems the sync for time has switched to normal time too early. Right mouse click to adjust this would not bring up the "adjust time" window. ?Why, unknown. I then decided I would go through "YAST" to do my changes, but now I am unable to load "YAST". I can load it through a terminal window, but there must be some reason why it won't load the GUI? from the menu.? There could be other programs that are also not loading that I have not found.
Q- could something have been lost when I had the H/D reboot issue? And if so is there any way of restoring lost or coruputed OS files?
I have the 10.3 OS on DVD, which is how I installed it, and note that there is a recovey prompt, but need some advise on how to go about it. A total reinstall is not an option at this time until I can get a backup unit running.
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Nov 25, 2010
I installed an Apache web server on Fedora 13. My website is built on PHP. When I try to access the web servers particular directory it take too much time to load.I have added index.php in DirectoryIndex statement also in the httpd.conf file. The home page of my sites has 150 kb image file.
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Jan 5, 2010
I'm running Ubuntu 9.10 and Windows XP on my system. After installing Ubuntu, it boots normally about once, and then the next time I try to boot, I have to wait a few minutes with it saying "GRUB Loading." I have read other threads about this that say that it is clearly a GRUB2 problem, and something about Windows overwriting something with the MBR; although I haven't booted into windows once in the process of installing Ubuntu (multiple times) or afterward. GRUB version 1.97~beta4.
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Feb 18, 2011
I have increased my RAM from 2 MB to 4MB, Vista can see most of it(it can't see more because it is 32 bits)but when I run Virtual box I can only see up to 2MB of memory.Is there anything I can do to fix this?
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Oct 14, 2009
I need to start an application (graphical) when the PC start, even before anybody login, and use/launch a specific user. Now only can do this manually; when gdm starts, switch to any text tty [ie. Ctrl + Alt + F1], then I login into the special user, start a X server, export the DISPLAY environment variable, and start the application.
With this steps:
Code:
$X :1 -verbose -nr -nolisten tcp &
# Maybe Metacity -> $ metacity
$export DISPLAY=:1
$JavaApp &
Now i need put this steps (script) in some place to launch the app automatically, and with and specific user [ie. manager].
How can I made it? Maybe in init.d? or an special xinitrc? And how can start the app with the specific user? And, if is possible, who can stop the app when the system going turn off? I have Debian 5.0 and a beginner knowledge of shell script.
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Dec 1, 2010
i have installed ubuntu ultimate edition 10.04 in my toshiba c650 recently,however it is taking too long before it startup. 2 when i log off the cursor still remain untill all power have been discharged. what could be the problem
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May 27, 2010
I am using KVM and created four guest Operating systems on it.The server host is Ubuntu 10.04.I am using 4 websites in a reverse proxy environment.One of our website is running on CentOS VM.Right now there is no traffic on the website static HTML pages.I do not have any clue as why it was taking longer time to be accessed.
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Jul 17, 2011
After increasing the volume on banshee about the half of it the sound goes off. I have to decrease the volume in order to make it work
My hardware config is:
AMD phenom II X4 840 Processor 3.20 GHZ
RAM 4 Ghz
HDD 1 T
ATI VIDEO
VIA HD SOUND CARD
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Dec 21, 2009
I just installed fedora 12 on my system. When I run any command with sudo the following line appears. Mario is not in the sudoers file. This incident will be reported. For the record, I am the administrator of this system. Not unauthorized to run sudo.
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Jun 1, 2009
I am using redhat linux enterprise 4.0. I have need to increase /home partition size, without loosing data.
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May 11, 2011
I am running Centos 5.5 in vmware and recently had to increase my disk space from 20GB to 40GB. I understand that in linux, the increased disk space is not automatically reflected but as I am new to this topic, I am not sure how I can go about doing this. how to see what's the available space and how I can partition(?) this.
For your reference:
[root@localhost ~]# fdisk -l
Disk /dev/sda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
[Code].....
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May 27, 2010
I am using KVM and created four guest Operating systems on it. The server host is Ubuntu 10.04.I am using 4 websites in a reverse proxy environment. One of our website is running on CentOS VM. Right now there is no traffic on the website static HTML pages. I do not have any clue as why it was taking longer time to be accessed.
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