CentOS 5 :: High CPU Utilization For All Processes?
Apr 9, 2010
I am getting a strange problem with my new machine (P4 3Ghz, 1 GB RAM DDR333). The machine is an industrial PC. Firstly I had installed Fedora Core 2 on it. It ran superbly without any problem. I tried to load Redhat Enterprise Linux WS4 (Update 2 as well as Update 5) on it. But the PC was giving high CPU utilization for each and every task. With-out any application running both the cores shows utilization around 10 %. But when i try to my application, the CPU utilization in one of the cores goes to 100 % for majority of the time. This is causing my appilcation to run slowly when compared to the same application running on the same machine under fedora core 2. (CPU Utilization around peak 17 % in either of the cores in Fedora Core2) Recently I installed Cent OS 5 on it. But the behavior of the PC remains the same as of Redhat Enterprise Linux WS4. Some-where on the forums I had read about the RAM size. So i tried to downgrade the RAM from 1 GB to 256 MB. But the problem remains the same. I think it has to do with some kernel tweaking.
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Nov 12, 2010
I installed the NVIDIS driver for 64b Linux, and now I face a high cpu utilization (up to 40%) in the XORG when I swith from one application to another. I need the driver because otherwise some web pages are rendered with a something like a watermark
LSPCI
01:00.0 VGA compatible controller: nVidia Corporation G98M [Quadro NVS 160M] (rev a1) (prog-if 00 [VGA controller])
Subsystem: Dell Unknown device 024f
Flags: bus master, fast devsel, latency 0, IRQ 169
Memory at f5000000 (32-bit, non-prefetchable) [size=16M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
Memory at f2000000 (64-bit, non-prefetchable) [size=32M]
I/O ports at df00 [size=128]
[virtual] Expansion ROM at f4000000 [disabled] [size=128K]
Capabilities: <access denied>
NVidia driver
260.19.21
uname -r
2.6.18-194.26.1.el5
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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 7, 2011
Been using Maverick on my Dell Studio XPS for many months without issue. About a week or two ago, compiz has been acting funny and using a lot of cpu time, making everything "choppy," especially after resuming from suspend. I've googled and searched the forum, but all the related posts seem to be several years old.I tried selecting the previous kernel but it didn't help. Was there a bad update to compiz or ati graphics?
My info:
Code:
> lspci | grep VGA
21:02:00.0 VGA compatible controller: ATI Technologies Inc Madison [Mobility Radeon HD 5000 Series]
> grep -i driver /etc/X11/xorg.conf | uniq
Option "VendorName" "ATI Proprietary Driver"
Driver "fglrx"
[Code]...
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Jun 27, 2011
I try to open an application, and it's painfully slow, and i think "this is weird i've had it open just 10 seconds ago and it should be in the cache". the disk is constantly working, so maybe i ran out of ram and it's swapping, so i check: according to 'free -m', about 200m of 2g ram is used (without buffers/cache), but still also 200m of swap is used, although swappiness is set to 1 (low tendency to swap). so this is not normal.also, kswapd0 is eating pretty much cpu (but not 100%). switching to tty1, logging in, and starting iotop takes about a minute. according to iotop, about 8 random processes (could be a browser, could be some daemon) have 99% IO activity (i'm not sure what that means, how can 8 processes take 99% each?).after the first 3 times, i disabled swap by adding swapoff -a to rc.local, but it's still the same, and kswapd is still among the cpu-eaters.
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Apr 7, 2011
Using Ubuntu server 10.04.2 64-bit all up to date.
I am running multi-threaded processes. These use OpenMP in my own code and the multi-threaded ACML maths library. When run in the foreground, everything is fine i.e. if I have set
export OMP_NUM_THREADS=8
then when I start all 8 cores are in use and things whizz along. However, when running overnight and logged out using e.g. 'at now + 1 minute' then the command, I am only getting about 130% CPU and it slows down accordingly. I have tried renice'ing and calling from within a bash script in case sh is doing something odd but nothing seems to solve it. I am sure that in the recent past this wasn't the case.
The libraries being used are shared versions in case that might have any bearing.
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Jul 20, 2010
I'm riding just a firewall. these are the processes running.
I want to remove scsi_eh_x processes, and I have only disk sata.
How do I remove these processes permanently?
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Jan 19, 2011
I can able to view there is high amount of memory & swap usage on the server, upon investigation found that there are high no of page faults happening on the server more than 300 .. Is there is any option to fix the page faults , and also how to release the locked memory with out using drop_caches..
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Apr 5, 2011
I am calling clock_gettime() function to get time with nano seconds accuracy. My program works fine on Ubuntu but have high CPU usage problem on CentOS 5. it takes 40% CPU on Ubuntu and 90% CPU on CentOS. Kindly give me solution so that I can reduce high CPU usage problem on CentOS. You can build this code like: "gcc -lrt gettime.c -o gettime.e"
[Code]....
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Mar 28, 2010
My server is really slow. When I did a top -c or ps aux, below shows up. Shouldn't there be only one? Shall I kill all those processes and leave only one?
3135 nobody 15 0 15900 5232 1860 S 0.0 0.1 0:00.17 /usr/local/apache/bin/httpd -k restart -DSSL
3173 nobody 16 0 15900 5244 1848 S 0.0 0.1 0:00.05 /usr/local/apache/bin/httpd -k restart -DSSL
3174 nobody 15 0 15900 5232 1860 S 0.0 0.1 0:00.15 /usr/local/apache/bin/httpd -k restart -DSSL
5153 nobody 15 0 15900 5228 1860 S 0.0 0.1 0:00.04 /usr/local/apache/bin/httpd -k restart -DSSL
7598 nobody 16 0 15900 5228 1872 S 0.0 0.1 0:00.20 /usr/local/apache/bin/httpd -k restart -DSSL .....
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Apr 5, 2009
I recently installed Centos-5.3-x86_64 in a PowerEdge2950 machine, to serves as an ftp server using proftpd-1.3.2. I noticed that the CPU load is much higher than the days when I was using RHEL-4.7-X86_64. In the past, CPU load get higher than 100 only when there're about 400 online users. But in Centos-5.3, the CPU load gets higher than 150 when there're 200 users.
The details of the server machine: Intel Xeon E5430, 16 GB RAM, 1.8 TB as a RAID disk, 400GB hardisk used to installed the system.
More details:
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Dec 18, 2009
I have a user complaining about performance:-
Quote: At times on our server, during more-or-less idle moments, context switching is around the 2000-3000 mark.When we run the app, we can get this up to the 500,000 CSs per second. Not only this, but at the same time, the CPUs go to >60% system (the kernel is having to do all that context switching after all), leaving only around 30% for user space. We think it is a possibility that the massive context switching is contributing significantly to our performance issues.
The server is a HP DL580 G5 with 4 x Intel Xeon E7340 @ 2.4Ghz.My issue is that I don't know if the contect switching is a problem or not.From what i've read those values are not necesserilly cause for concern.
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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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Jul 9, 2009
Is there a way to create a high availability environment between two CentOS machines? I don't mean just the HTTP service or just one other thing. I need the entire server synced in real time ready to take over if the next goes down.
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Nov 20, 2010
It is now almost 3 'o clock in the night here, last 5 hours trying to fix this problem. CentOS always runs perfectly here. I am not a genie with the terminal so wanted to install GNOME on my vps, than vnc but didn't work and did a restart.
Now got this:
Quote:[root@srv1 conf]# apachectl start
Syntax error on line 41 of /etc/httpd/conf/httpd.conf: Invalid command 'Order', perhaps misspelled or defined by a module not included in the server configuration
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Nov 24, 2010
I have several CentOS 32-bit VMs running on ESX 4. Those that were updated to the most current patch level ("yum update", accepting all updates available last week) started showing load average of ~0.4 when completely idle. After comparing the problematic VMs with those that show zero load average at idle, and then modifying them in all kinds of ways, I narrowed it down to the combination of a recent kernel patch (2.6.18-164 is fine, 2.6.18-194 is not) and E1000 network adapter. Replacing the network adapter on a problematic VM with VMXNET3 fixes the load statistics.
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Jan 25, 2011
Under high UDP traffic condition, we find we cannot receive UDP packet (can be captured by tcpdump) from socket neither use bare "recvfrom" nor "select recvfrom " pair. Is there any similar problem reported from user?
Any tunning or socket establish option can help?
Or is there any improvement available from the latest version?
our using linux version is CentOS 5.5
ethernet driver version is Intel (R) Gigbait Ethernet Network Driver version - 1.3.16-k2
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May 5, 2009
I have been wanting to increase the fps rate of my current game servers, and I need to have a custom config for this cause I'm only hitting 500. I have, attached, a custom kernel config and not to sure what to do with it at this point. The file name is config-2.6.24-zen4-lld.no-po.2000hz
#
# Automatically generated make config: don't edit
# Linux kernel version: 2.6.24-zen4-lld.no-po.2000hz
# Tue Nov 25 22:54:23 2008
# Zen Options
# Kernel Tunables
# CONFIG_ZEN_SERVER is not set .....
# IO Schedulers
# CONFIG_FINGERPRINTING is not set
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Apr 20, 2010
I'm on 5.4 with a Shuttle X50 and am having a lot of trouble getting sound working on this box. In Gnome the card is detected properly and nothing is muted, but no sound comes out of the speakers when I do the test. Checked in the bios and the audio is enabled so I'm stumped... heres some info for reference:
[Code]...
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Jul 23, 2010
I'm trying to configure an ISCSI/DRBD high-availability cluster and I'd like to know what is the best option between OpenAIS and Heartbeat. I've seen they both are included in Centos Repos, yet OpenAIS requires installing 2 addition repos to install Pacemaker (EPEL and Clusterlab repos).
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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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Mar 15, 2009
Yesterday I installed a new server with a large partition for my XEN images. This partition is a about 930GB. The installation tooks ages and after he finished I was finding out why that is. The SoftRAID1 I configured is rebuilding the large partition.
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Oct 30, 2010
It always fails when I try the sound card test. It says like the system cant detect the sound card.
Sound Card: 5 series / 3400 series chipset high definition audio
Module: snd-hda-intel
After searching about the issue, I found the information that installing kmod-alsa-PAE-1.0.20-1.el5.elrepo.i686.rpm and kmod-alsa-1.0.20-1.el5.elrepo.i686 would solve the problem.
But even I downloaded and installed them, nothing changed.
== BEGIN uname -rmi ==
2.6.18-194.17.1.el5PAE i686 i386
== END uname -rmi ==
== BEGIN rpm -q centos-release ==
centos-release-5-5.el5.centos
== END rpm -q centos-release ==
== BEGIN ls /etc/yum.repos.d ==
CentOS-Base.repo
CentOS-Media.repo
elrepo.repo
epel.repo
epel-testing.repo
mirrors-rpmforge
rpmforge.repo
rpmfusion-free-updates.repo
rpmfusion-free-updates-testing.repo
rpmfusion-nonfree-updates.repo
rpmfusion-nonfree-updates-testing.repo
== END ls /etc/yum.repos.d ==
== BEGIN lspci ==
~
00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 05)
~
== END lspci ==
== BEGIN lspci -n ==
~
00:1b.0 0403: 8086:3b56 (rev 05)
~
== END lspci -n ==
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Dec 21, 2010
what dose this mean top -n 2 -b -d 0.2 i?
how to get all CPU utilization in using top command
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May 6, 2009
How to get cpu utilization of particular process without using top command. I want programmatically C or C++.Top command source is large.I can't analyze where %cpu usage got.
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Feb 26, 2010
language:cOs: ubuntuI have googled for a c program to get cpu utilization factor from 2 days.We can get it through "top", "who" commands..But I hav not found any API or a program.
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Jul 15, 2009
Is there any command to get the memory utilization of a particular process in Linux?I tried with Top and /proc/pid/status commands but the results are not proper, the memory keeps on increasing.Can anyone tell other than Top and /proc/pid/status commands ?
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Nov 9, 2010
I have a storage array and one of the logical volumes stays at 100% utilization whenever any process accesses the volume. It is a 9TB RAID 5 array on it's own SCSI interface card. I have another 9TB logical volume in the same chassis, on it's own card that does NOT exhibit the same behavior.
I'm measuring the utilization using atop. The strange thing is it pegs out at 100% utilization for the entire time a process accesses the volume, even when the data being accessed is just a few kb. My users home directories reside on this volume so as you can imagine every user is impacted whenever someone accesses any file from this volume.
The only processes being shown in atop are nfsd processes and xfslogd process. Nothing has been deliberately changed on this system. The only thing out of the ordinary that changed is a user deleted several TB from his home directory a week or so ago, just about the same time this problem came up. During the troubleshooting process, tis system has been rebooted several times.
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Oct 21, 2010
I have a Ubuntu 10.04 LTS and about 40 ThinClients running LSTP in a school's computer lab. Everytime the users start to use applications, the server's memory utilization increases, while the swap memory is quite free. I have 12GB of memory on that server.
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Dec 28, 2010
how does calculate all processor utilization in ubuntu using top command?
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