CentOS 5 :: High CPU Load On Dell PowerEdge2950

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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CentOS 5 :: Determine What Is Causing High Load

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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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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I have a debian system with the following version you can se bellow. My problem is that one one single core of 4 it's running 100% all the time and i cant seem to find out why. The load is also high(load average: 0.91, 0.75, 0.40) because of this. This keeps happening even after reboots. The system if freshly installed twice and the same problem occours as soon as it boots. Something called kworker is running and causing the load / CPU load, is that normal for a fresh install??

root@Cyberdyne:/# lsb_release -da
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 8.2 (jessie)
Release: 8.2
Codename: jessie

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Aug 10, 2011

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Apr 2, 2011

on an old server of mine, as soon as apache is started, the load average that I get to see with 'top', that normally is under 1, now just steadily climbs up and up to easily 150, in fact disabling the webserver from serving any webpage. I've checked netstat, and I'll try to upload the output. The ip's that are in there I've blocked with iptables. But that doesn't help or so it seems. I see nothing weird in the error logs. As soon as I stop apache, the load goes back to normal. As soon as I (re)start it, up it goes again. What can cause this and how do I get rid of it?

p.s. It's an old server, fedora3 or so, and I've got a new one to which I'll transfer the domains, but until that's completely done, I'd like this one to run as it has for years...

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The load average is almost 1.06, but cpu is not 100% utilized... I am just wondering why load average is 1.06 in that case still ? (well i monitored cpu for long time, it never exceeded above 40%)can anyone explain the reason behind it ? Also is the system over utilized in this case ?

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Oct 13, 2010

I asked around about in the now closed thread: [url]

For about half a year ago, is not present in 10.10. That is I can now use the Dell U2711 monitor at its full resolution, using a Radeon HD 4550 (RV710) card, with acceleration and without the image beeing distorted, using the open xorg radeon driver.

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Since upgrading from 9.10 to 10.04, my system is noticeably less responsive and exhibits halting behavior for at times 10s of seconds. There is nothing obvious in the various logs that I can find. The only objective indication I can find that demonstrates that something is seriously wrong is that my load average never drops below 0.5 and is often over 1.5, even at idle. In this situation, top/ps/whatever shows very few processes running (usually just top). This suggests to me that either the new kernel scheduler is horrible or that something new is resulting in blocking I/O or other uninterruptable sleeps.Typical top output:

Quote:

top - 12:18:01 up 1 day, 49 min, 5 users, load average: 1.42, 0.86, 0.71
Tasks: 262 total, 1 running, 261 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.9%us, 0.8%sy, 0.0%ni, 97.6%id, 0.0%wa, 0.0%hi, 0.7%si, 0.0%st

[code]....

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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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Jul 6, 2010

I am facing a high load averages in one of my linux server find the output of the top command.

[code]...

How to reduce the load averages.

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During downloads, the top command shows the Firefox process at 100% CPU. Yesterday I tried to download an .iso image. After a few hours the Firefox window would not refresh nor would it respond to input. I tried the wget command. It used negligible CPU time and completed in 28 minutes.

This problem is easy to reproduce because it happens every time I download a file in Firefox. It also happens when I use a fresh profile to run Firefox without any extensions or plugins.

This is Firefox 3.6.12 on Fedora 14.

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Feb 10, 2010

I have High load on my server and my investigation shows nothing (so i believe that my investigations is wrong ), the load average in this moment is 10.13, 9.47, 8.24. , mentioning the below.

- The disk utilization (all the disks) is near 0, as the result of the IOSTAT
- There is no blocked processes (as a result of VMSTAT).
- I have two processors (dual core) , the maximum load average should be something around 4.
- The server always have above 8 load average in all times interval.

btw , my OS is RHEL AS release 4 (Nahant Update 7)Kernel :Linux 2.6.9-78.ELhugemem #1 SMP i686 i686 i386 GNU/Linux

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Jan 13, 2010

I have high load average on the servers with no identified reason (From my point of view)

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Jan 9, 2011

I just posted about this in this thread, but as the other thread was started by a KDE user then I thought I'd post here as well. I've had high CPU usage for a few months now - probably since trying the 0.9 branch of Compiz then dropping back to the default openSUSE builds (XOrg and gconfd-2 running a Core i5 at about 30% on every core*). I've now finally found a solution after deciding I wanted to fix it once and for all.

Once again, the Ubuntu forums come to the rescue with this thread (I don't like the distro as a whole, but I do find the forums useful!). I'm using Compiz, but it turns out that Metacity was running as well. A quick "killall -9 metacity" and the gconfd-2 process has vanished and XOrg settled down to its normal 1-2% (which is reasonable when I've got a Conky config refreshing every fraction of a second to repaint a sound visualiser!). Now I just need to find out why Metacity starts when I'm using Compiz...

* according to Conky's per-core graphs, although top only reported 15% overall and the Conky "top 3 procs by CPU" reported a measly 3% for each process, so someone's maths was out somewhere!

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May 10, 2010

I upgraded webserver to new ubuntu server 10.04 (x86-64). After upgrade the increased load from 0,3 to 1,4. On webserver running phpbb, which generating slow quieres, which not before upgrade to lucid. HW conf: Intel Core i7, 8GB ram, WD Raptor 10k rpm. Week17 upgrade to new version.

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Oct 15, 2010

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Nov 26, 2010

I am having a problem with the server that I use to host my personal site. The load average quite often spikes to exceed 1.00 for the 1 and 5 minute intervals, and the 15 minute interval gets above .5. This occurs while the server is idle, serving very few or no requests and with the CPU 99% idle with <1% IOWAIT usage. I have checked top and vmstat, but neither one provides any useful info. Top continues to say the CPU is 99% idle, and vmstat says that there are 0 runnable and 0 blocking tasks. Occasionally, vmstat will say that there is 1 runnable task, but this doesn't even coincide with the load average spikes. I have already searched for other solutions to this problem, but everything I have seen says to use top and/or vmstat, but those aren't showing anything out of the ordinary. Can anyone recommend anything else I might do?

My server has a Pentium 4 HT 3gHz processor, 2GB RAM, and runs Kubuntu 10.10. (The reason it runs Kubuntu instead of Ubuntu Server is that it needs an X environment so that the Nvidia driver can initialize and put its graphics card into a power saving mode.)

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Jul 6, 2010

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- Intel Xeon 2.66GHz Dual Core
- 4MB cache memory
- 1GB RAM memory
- 50GB hard disk

Is this load average normal? Should I program the plugins with C?

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Jul 16, 2010

Just noticed that during calls skype uses ~30-50% cpu, + pulseaudio uses ~20%. I found some old threads on this like [URL] Or [URL]. The former suggests to purge pulse and use alsa/oss instead. The latter suggests changing mic in skype to DeviceXX and tweak the pulse.conf
There's also a launchpad bug on that with status Confirmed->invalid (due to "problem fixed in skype 2.1 beta") but looks like it's not (I am using 2.1 beta)

1. Does any1 has this problem?
2. I can't try 2nd link's approach as my skype has only PulseAudio in the settings, so I can't select Device or anything else!
3. Should I try to remove pulse in favor of ALSA? I'm pretty happy with pulse otherwise that this issue, I use it to record sound out of my sound card and I'm not sure if I can do this with alsa/os.

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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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uname -a:

Code:

Linux myfirewall.mydomain.com 2.6.8 #1 SMP Mon Oct 18 11:20:22 CDT 2004 i686 i686 i386 GNU/Linux
top:

Code:

07:55:43 up 1503 days, 17:13, 5 users, load average: 26.50, 26.33, 26.25
Tasks: 245 total, 2 running, 243 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.6% us, 1.1% sy, 0.0% ni, 95.0% id, 2.7% wa, 0.2% hi, 0.5% si
Mem: 3895508k total, 3582272k used, 313236k free, 207468k buffers
Swap: 2040244k total, 112664k used, 1927580k free, 1358744k cached

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I am trying to setup a High-Availability HTTP Load Balancer With HAProxy & Heartbeat using the below links.

I have all RHEL 5.4 servers hosted on VMWare.

[url]
[url]

This is the scenario, as given in the links as wells as my setup.

Load Balancer 1

Load Balancer 2

Web Server 1

Web Server 2

I have followed all the steps mentioned in the links religiously except the 2.2 here, in which it is asking to configure the vhosts. I could not really understand , what is to be placed in /etc/httpd/conf.d/vhosts.conf file and in which Web Server.

Due to this step only, I think I am failing in Failover test given in Point 4.1 here. I am able to open the webpage by [url] which gives the content of Web Server 1 (http1.example.com). But, when I try to shutdown the http service (to check failover), it does not shows the contents of Web Server 2 (http2.example.com)

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Nov 4, 2010

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[code]...

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Cpu0 : 0.4%us, 0.0%sy, 0.0%ni, 98.2%id, 0.0%wa, 0.0%hi, 1.4%si, 0.0%st
Cpu1 : 0.7%us, 0.0%sy, 0.0%ni, 16.1%id, 0.0%wa, 0.3%hi, 82.9%si, 0.0%st
Cpu2 : 0.0%us, 0.0%sy, 0.0%ni, 96.1%id, 0.0%wa, 0.0%hi, 3.9%si, 0.0%st

[code]...

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