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icon5.gif  VPS&cPanel: High processor load [message #8591] Tue, 28 November 2006 11:15 Go to next message
fransonline is currently offline  fransonline
Messages: 22
Registered: May 2006
Junior Member
Hello!,

I am running cPanel on a VPS.
The avarage processor load is much to high: 8
Sometimes it goes up to 20 à 30. Embarassed
Although it's a Dual Opteron server.

I tuned the UBC paramaters, which helped a little but not enough.
May be I am over looking something.
I would be very glad to have some tips on my config of this VPS or may be a visit to my server with expert eyes Smile

Thanks in advance,

Frans

# vzcpucheck
Current CPU utilization: 163500
Power of the node: 204589

Config VPS
# UBC parameters (in form of barrier:limit)
# Primary parameters
AVNUMPROC="40:40"
NUMPROC="800:800"
NUMTCPSOCK="512:512"
NUMOTHERSOCK="140:140"
VMGUARPAGES="98304:2147483647"
# Secondary parameters
KMEMSIZE="1101004800:1200000000"
TCPSNDBUF="1300000:2900000"
TCPRCVBUF="800000:2110720"
OTHERSOCKBUF="732096:1136896"
DGRAMRCVBUF="800000:900000"
OOMGUARPAGES="6144:2147483647"
# Auxiliary parameters
LOCKEDPAGES="32:32"
SHMPAGES="8192:8192"
PRIVVMPAGES="450000:500000"
NUMFILE="60000:60000"
NUMFLOCK="100:110"
NUMPTY="16:16"
NUMSIGINFO="256:256"
DCACHESIZE="1572854:23040000"

PHYSPAGES="0:2147483647"
NUMIPTENT="2048:2048"

# Disk quota parameters (in form of softlimit:hardlimit)
DISKSPACE="90000000:93000000"
#DISKINODES="200000:220000"
DISKINODES="2147483647:2147483647"
QUOTATIME="0"

# CPU fair sheduler parameter
CPUUNITS="100000"
VE_ROOT="/vz/root/$VEID"
VE_PRIVATE="/vz/private/$VEID"
OSTEMPLATE="centos-4-i386-default"
ORIGIN_SAMPLE="vps.basic"
IP_ADDRESS="85.x.x.x"
HOSTNAME="srv01.xxxxxxx.nl"

#QUOTAUGIDLIMIT="200"
QUOTAUGIDLIMIT="2000"

CPULIMIT="75"
CAPABILITY="SYS_TIME:on
Re: VPS&cPanel: High processor load [message #8595 is a reply to message #8591] Tue, 28 November 2006 15:20 Go to previous messageGo to next message
rickb is currently offline  rickb
Messages: 368
Registered: October 2006
Senior Member
Sounds like the vps is hitting its cpulimit, set it to 200 so that the VE can utilize all cpu resources in the server. If its a dual core, dual cpu opteron, it will be 400.


-------------
Common Terms I post with: http://wiki.openvz.org/Category:Definitions

UBC. Learn it, love it, live it: http://wiki.openvz.org/Proc/user_beancounters
Re: VPS&cPanel: High processor load [message #8600 is a reply to message #8595] Tue, 28 November 2006 23:07 Go to previous messageGo to next message
fransonline is currently offline  fransonline
Messages: 22
Registered: May 2006
Junior Member
Thanks for this great tip!
It solve my problem.

Still don't know what the numbers for parameter exactly stand for.
Why 200 t use all resources?

Re: VPS&cPanel: High processor load [message #8601 is a reply to message #8600] Tue, 28 November 2006 23:11 Go to previous messageGo to next message
rickb is currently offline  rickb
Messages: 368
Registered: October 2006
Senior Member
What specific resource do you find confusing? Have you read the UBC page on the wiki?

Rick Blundell


-------------
Common Terms I post with: http://wiki.openvz.org/Category:Definitions

UBC. Learn it, love it, live it: http://wiki.openvz.org/Proc/user_beancounters
Re: VPS&cPanel: High processor load [message #8607 is a reply to message #8601] Wed, 29 November 2006 08:44 Go to previous messageGo to next message
fransonline is currently offline  fransonline
Messages: 22
Registered: May 2006
Junior Member
Rick,

I know the Wiki UBC info.
But I did not find an explanation about what you wrote:
 cpulimit, set it to 200 so that the VE can utilize all cpu resources in the server. If its a dual core, dual cpu opteron, it will be 400

So it's the cpulimit parameter, what does 200 / 400 mean exactly?

Thanks!
Re: VPS&cPanel: High processor load [message #8608 is a reply to message #8607] Wed, 29 November 2006 08:48 Go to previous messageGo to next message
rickb is currently offline  rickb
Messages: 368
Registered: October 2006
Senior Member
Quote:

CPULIMIT

Allowed CPU power. This is a positive number
indicating the share of the CPU time in per cent the
VPS may never exceed. You may estimate this share
as (allowed VPS CPUUNITS/CPU power)*100%.


http://download.openvz.org/doc/OpenVZ-Users-Guide.pdf


-------------
Common Terms I post with: http://wiki.openvz.org/Category:Definitions

UBC. Learn it, love it, live it: http://wiki.openvz.org/Proc/user_beancounters
icon9.gif  Re: VPS&cPanel: High processor load [message #8616 is a reply to message #8608] Wed, 29 November 2006 12:27 Go to previous messageGo to next message
fransonline is currently offline  fransonline
Messages: 22
Registered: May 2006
Junior Member
Thanks!
Still don't get it Sad

My situation of the HN / VE
HN powernode = 204589
VE cpuunits = 120000

Now the guide cpulimit: (allowed VPS CPUUNITS/CPU power)*100%.
Becomes: (120000/204589)*100% = 0,344

I don't see the link for the value 200 / 400 for cpulimit.
Or am I doing/reading something wrong?
Re: VPS&cPanel: High processor load [message #8620 is a reply to message #8591] Wed, 29 November 2006 13:39 Go to previous messageGo to next message
rickb is currently offline  rickb
Messages: 368
Registered: October 2006
Senior Member
Cpulimit and cpuunits are related but not dependent on each other. It took me a while to wrap my head around these concepts, I will explain them in detail..

cpulimit is an equivalent approximate MHz value that the VE can burst to. I say equivalent because its a number between 1 & 100*X where X is the number of cpus in your server. hyperthreading, dual core counts as another cpu in this case. cpulimit is easy to understand, if your server has two 3GHz processors, and you set the cpulimit to 50, your ve can burst to ~1500Mhz.

cpuunits is harder to understand because its specific to a shared resource architecture. Much like QOS on an IP network allows you to guarantee throughput to a class of traffic, cpuunits allows you to guarantee a certain slice of the cputime to a VE. Network QOS allows you to guarantee 7mbit/sec to WWW traffic on a 10mbit pipe. If you guarantee WWW 7mbit and FTP 5 mbit, when your traffic approaches 10mbit/sec, unpredictable things will happen to each traffic set. The same applies for cpuunits. cpuunits is a number based on the number of bogomips in your server. Its scaled up so its easier to divy out to many VEs. The number itself isn't important, it could be 100 or 1,000,000. A server with more cpuunits then another server doesn't necessarily make it faster- a P4 3GHz hyperthreaded will have more cpuunits then your dual opteron with 2Ghz one ach chip. what does that mean? nothing.

[root@neon ~]# vzcpucheck
Current CPU utilization: 454109
Power of the node: 478633

This server has 478633 cpunits to distribute. If you give half of them to a VE, that VE is guaranteed half the cputime in the server. You can say if this server has 6GHz of processing power and it has half the cpuunits allocated to it, its guaranteed around 3GHz of cpu power.

Hope this helps!
Rick Blundell


-------------
Common Terms I post with: http://wiki.openvz.org/Category:Definitions

UBC. Learn it, love it, live it: http://wiki.openvz.org/Proc/user_beancounters

[Updated on: Wed, 29 November 2006 14:02]

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Re: VPS&cPanel: High processor load [message #8659 is a reply to message #8616] Thu, 30 November 2006 14:09 Go to previous messageGo to next message
dev is currently offline  dev
Messages: 1693
Registered: September 2005
Location: Moscow
Senior Member

cpulimit is measured in percents of CPU.
100 means 1 CPU (100%), 200 means 2 CPUs etc.
if you have 4 CPUs, then you can tune cpulimit from 1 to 400, which
allows VE to use from 0 to 4CPUs available.

when you set cpulimit to 75 you have limited VE to 0.75*N_CPUS of your CPU power.
NOTE: cpulimit has nothing to do with cpuunits!


http://static.openvz.org/userbars/openvz-developer.png
Re: VPS&cPanel: High processor load [message #8669 is a reply to message #8659] Thu, 30 November 2006 22:08 Go to previous messageGo to next message
fransonline is currently offline  fransonline
Messages: 22
Registered: May 2006
Junior Member
Both thanks for your help and extra info!
It made cpulimit a lot more clear. Cool
Re: VPS&cPanel: High processor load [message #12058 is a reply to message #8591] Mon, 16 April 2007 15:42 Go to previous message
jonwatson is currently offline  jonwatson
Messages: 21
Registered: March 2007
Junior Member
Hello All

This is a little bit off topic for this thread, but mostly on...

I am attempting to determine what a good CPUUNITS value is for one of my VEs. I understand from reading that I can determine the total amount of CPUUNITS available to me by running vzcpucheck. However, when I do that I get the following error:

# /usr/sbin/vzcpucheck 
ERROR: Unknown format of /proc/fairsched column: weight not found


When I set up my HWNode I chose the 2.6.15-025stab014.1 kernel which, at the time, seemed a good choice. I've since learned that it is not supported and I've had a few issues where things don't work as expected before because of this.

I see that my /proc/fairsched file is empty:

-r--r--r-- 1 root root 0 Apr 16 09:42 /proc/fairsched


Is this yet another problem with the kernel I've selected or is there some other way to determine my total CPUUNITS?

Alternatively, can someone give me a decent number that might be reflective of a Celeron 2.4 with 1GB RAM?

Thanks!
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