CPU Usage Spikes
Oct 13, 2007
Ive had a server for a while now, and had a backup hdd installed recently.
There seems to be CPU spikes happening from time to time up to 35%
Usually it sits on 0.17 - 0.80
But suddenly its been jumping around.
I have no idea where its coming from, as I cant check it in time.
Its a new problem thats just come up, and Im not so sure what it may be, as I havent got any new accounts on it.
I do get bounced emails from mailman for some reason, and mail queue is usually large, but server was generally cleaned up from it being abused.
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Jul 9, 2009
How can I better monitor and trace down I/O spikes? I've noticed the wait hit 60% every now and again... could someone be running a rapidleech script and if so, how can i find it?
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Jan 15, 2007
Everything was running ok until last week.
I haven't really done anything new other then added another forum on the server (Invision).
Basically the problem is the random spikes I get. The main forum that is running on the server haven't really increased in terms of sim connections. Its usually around 180 - 220 during peak times.
On TOP there is usually around 250 tasks. When this thing started happening it would spikes to 500+ tasks which totally kills the server. Its pretty random also. Sometimes it'll go fine for a few hours and then suddenly climbed slowly up and then the server dies. For now its going to crash whenever I let apache run for an hour or so.
The only way I can restore is to restart apache. It has come to the point where I've had to put in restart apache in the cronjob list. Restart it every few minutes since I'm not always here watching over it. This is obviously a shortterm solution to keep the forum up while I troubleshoot this.
Here's a screenshot when it was just about dead
http://img392.imageshack.us/my.php?image=serverwf0.jpg
I checked out the logs and didn't see anything.
I was either told it needed more ram or that it was hacked.
The JRE is the flashchat I'm running and the trans_linux is a bot for the shoutcast.
Since I haven't been doing anything new.. I don't think its the resources of the server thats too little.
The server i have is
Dual Opteron 252
2 gigs of ram
1 146GB 15,000RPM scsi drive
how I can resolve it? Is Apache using more memory then its suppose to?
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Sep 16, 2007
I am currently moving from my current dedicated servers because they simply cannot handle the load. I have a site which frequently makes it onto radio, digg and other similar sites.
I need a dedicated server that can take a beating from Digg and offline Media. For most of the month the server load is really low, the site hardly uses up anything. However, when it hits those sites, it suffers.
I am OK with using Shell, just basic tars/logs/sqldumping/httpd.conf editing/rebooting etc.. anything beyond that like installing and configuring software I cant really do.
I guess I am looking at a dedicated option (linux based) with a host that'll setup software/modules modules for me when I ask, but doesn't really need to hold my hand all the time.
How are ThePlanet.com's servers? Do they manage the servers?
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Oct 28, 2009
I admit I know nothing when it comes to servers. Yet I do have a root server and I noticed that there are some days when the traffic spikes up to 20 times the average and when I login via ssh I see many perl processes. I don't know what those are since I don't use any perl scripts on my web site. Is this a potential or maybe an ongoing security issue?
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May 4, 2007
We've had a VPS for just over a month now. I am not going to mention the host by name (yet) but they advertise here and other people here reported liking them.
Sadly it's not my experience and I regret my purchase.
Every morning for the past few weeks, we get load spikes every 30 minutes that make our site unusable for a minute (on our VPS, any load over 1.0 is sluggish, over 2.0 is virtually unusable, over 3 is unresponsive)
Here's a series of days as an example:
[url]
The worst part about this is the host insists 1. either it's not happening or 2. they can't find it
I know it's happening because when I try to load a page on the half-hour, it takes over 13 seconds (less than 1 second normally). And it's fairly obvious it's someone doing a cron job with some nasty downloading, uploading, or maybe a massive mysql update.
Someone tell me what to tell them because this is driving me out of my mind. The load is NOT being caused by ourselves, I've made sure all our cron jobs don't happen on the exact half hour and we get lots of traffic later in the day without loads.
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Feb 15, 2009
I have been using Blue Host for years, but recently they kept suspending my account due to performance problem.
I was only running a php forum (phpBB3) and a Wordpress blog. They kept mentioning it is not problem with space/bandwidth, but issues with "Running application causing high load", and the mysql queries from phpBB3 are taking too long.
Now I am planning to add a Ruby on Rails application. I am sure it will cost more CPU usage. What should I do? Will a move to VPS hosting solve my problem?
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Oct 14, 2009
We are currently looking to move to a new dedicated server provider located in the United Kingdom. The server is solely used to provide an IRC daemon to a large IRC network that receives multiple gigabits of DDoS and PPS. We are currently with another hosting provider who can no longer support us.
Our current specification is DualCore Xeon 2.67Ghz/4MB Cache with 500GB SATA HDD. A good connection and available bandwidth (preferably 3-5,000 GB bandwidth /month) included in the price. We are seeking to move to a new dedicated server host, if you know a company that can accommodate our needs,
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Nov 7, 2009
I need to copy some large files from ServerA to ServerB, I want to use scp command.
I need a step by step guide to use it please.
from which server should I start the conection?
what is command to use?
...
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Jul 14, 2009
How do you prevent people from using different IPs on a machine that has a couple VPS clients on it.
If client A has xxx.xxx.xxx.100-xxx.xxx.xxx.103 and client B has xxx.xxx.xxx.104-xxx.xxx.xxx.105. How do you prevent client B from using client A's IPs? Can't he easily modify the config file for his ethernet device to use an IP that hasn't been assigned to him but is assiged to someone else on the same machine?
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Apr 18, 2008
i checked the CPU usage on my vpc tru Plesk and Remote control, bouth stating i got high CPU usage around 89% 90% TO 96% up and down, no program is using the resources they are all in 0% in the process tab, but when you check the Performance it stats 95%, i dont understand what is going on,
it's a windows O/S ,vps
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May 6, 2008
I have VPS with 1GB ram and run same proxy sites in VPS,but sometime usage Ram is high almost 80%, but if I see in histat I see user online is same with usually..
and when I use command netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n I see 1 or 2 IP is 200connection , what is mean?
is Ddos attack or what? and I try to ban this IP using command iptables -A INPUT -s [this IP adress]
but I see this IP still connect? so what must I do?
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Aug 30, 2008
When I remote into my Windows VPS, Task Manager shows 80% CPU usage on the Performance tab, however, if I look at the running tasks, there's hardly any CPU usage. Is Task Manager including CPU usage from all other VPS's on the box?
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Oct 7, 2008
How to find which process is using my CPU/RAM on Windows VPS(Virtuzzo). Any tool for the same?
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Oct 12, 2008
Besides web hosting what are some of the other applications are you using VPSs for?
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Jul 27, 2008
For about a couple of days (no configs were changed) I am experiencing high cpu usage from time to time.
At this moment and what I can see is this:
Sites are using low cpu resources, top process is mysql + 1-2 php defuncts replacing each other, after that - httpd requests
Something happens and php are starting to use more cpu thant it should. Cpu top usage shows all php files in all accounts replacing each other (index files, scripts there are like wordpress, forums, etc).
Server crashes... Or I kill all php processes, restart apache and it goes back to normal mode again.
I had the same issue months ago, just cpu usage was even more agressive and much often. After days of checking, I've found that it was
Curl and/or Curlwrappers which were cauisng that. After recompiled apache without them (left curlssl only), cpu load was always stable.
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Jun 19, 2008
I m currently hosted on a shared host and this is the stat for on eof my site:
Hours CPU Time Execution time CPU Usage Average Memory Processes
0-6 20.46 s 98.86 s 0.24% 2.52 MB 105
6-12 246.99 s 1927.26 s 2.86% 2.46 MB 1328
12-18 373.3 s 3660.48 s 4.32% 2.52 MB 1867
18-24 250.57 s 2800.82 s 2.90% 2.52 MB 1259
So it shows my site uses avg 2.52 MB RAM. This is in shared hostinng plan.
Now suppose I am going for a VPS server with 256 MB RAM, does that mean I will get whole 256 MB RAM for my Site usage or the OS and other application will also consume that amount of RAM.
What I understand that when you go for VPS, the allocated processor and RAM capacity to yur plan will be used by the OS, the cpanel or any other scripts and the Database. So basically they together will consume nearly 256 MB RAM.
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Jul 9, 2008
Seems to have accidently cut out of my screenshot, but the 4th column reads "NI", can anybody tell me what this is?
There are a few negative values, is this bad?
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Jul 20, 2007
My site seems to be quite slow at peak times because it is on shared.
I believe a VPS or Semi-Dedicated would be the best way to go.
I don't have too much to spend and I will post my usages below.
I run vBulletin 3.6.7, and at high peak times around 80 users are online, but that can drop to 30 at low periods.
As I said, I would think that VPS would be the way to go..
I have around 20-25USD to spend per month (maybe if you can assist me in finding an offer/promotion..)
I would need DirectAdmin included and preferably Fully-Managed.
I wouldn't be hosting any other sites, apart from my one with vBulletin.
It is a low budget, but if you can't find a VPS, maybe Semi-Dedicated or a flexible shared package..
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Jul 23, 2007
I have a flash game site,and it's on shared host.
Sometimes it use more than 20% CPU,so it's often down 1-2minutes.
I want to know how much % cpu does vps limit?
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Jun 23, 2009
It seems that a user may get more percentage of memory purchased for real use. I've got a xen VPS which has access to all 8 CPU cores. Guess this is a good thing to be able to burst CPU resources
[xwu@atom ~]$ cat /proc/cpuinfo | grep processor | awk '{a++} END {print a}'
8
But this requires lots of kthread running to be able to access all CPU resources, which in turn consumes quite some memory, a valuable, limited resource on a small VPS instance.
[xwu@atom ~]$ cat /proc/meminfo | grep Mem
MemTotal: 524288 kB
MemFree: 276128 kB
The output above is grathered when almost no other services are running except sshd.
While XEN VPS surely consumes more memory than OVZ VPS, I would suggest the Xen VPS can be built in such a way less memory is required to just do the housekeeping.
Of course, that would imply careful provisioning, maybe less "overselling" for the sake of lack of a term. The bottom line is how we can reduce the memory usage, while ensure individual VPS instance can still have fair share of CPU if needed.
Is there anyway in the VPS kernel config which can disable access to certain CPU core, thus reducing the number of kthreads and etc?
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Nov 2, 2009
For some reason, one of my clients wordpress blog is using 100% cpu on a php process per page load. To clarify, the first time you load the page it is very slow, and uses 100% cpu for the PHP process and then if you reload the page (while it is going slow) it loads very fast. After that is done the normal PHP usage per page load is roughly 1-4% if that.
I'm guessing something in the coding is looping, but I am unsure. What I do know is 100% cpu usage for one page view initially is insane.
Does anyone have any ideas on how to fix/resolve this issue?
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May 4, 2009
Which host company you think is the best in terms of allowing a good % of the cpu on shared plan,
so far i have found the following
bluehost not exceed %50 for more than 30 Sec.
hostgator %25 for 60 Sec.
webhostingpad %10 for 30 Sec.
what is the % of cpu allowed on your host?
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Feb 26, 2009
Can you recommend a method to check ram usage of my vps for the last 24 hrs?
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Jun 27, 2009
I just uploaded a wordpress site and it already used up 300mb ram. The site receives very little traffic so I doubt the traffic is the cause of the ram usage. Is this normal? my control panel is webmin
Code:
ID Owner Size Command
17691 mysql 129620 kB /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --pid-f ...
13799 named 70392 kB /usr/sbin/named -u named
14329 apache 44176 kB /usr/sbin/httpd
28588 apache 41028 kB /usr/sbin/httpd
7812 apache 38016 kB /usr/sbin/httpd
23719 apache 37416 kB /usr/sbin/httpd
23825 apache 36800 kB /usr/sbin/httpd
19656 root 24224 kB /usr/sbin/httpd
23973 root 12628 kB /usr/libexec/webmin/proc/index_size.cgi
23972 root 12232 kB /usr/libexec/webmin/blue-theme/left.cgi
19533 root 10776 kB /usr/bin/perl /usr/libexec/webmin/miniserv.pl /etc/webmin/miniserv.conf
18376 root 9024 kB sendmail: accepting connections
18384 smmsp 8116 kB sendmail: Queue runner@01:00:00 for /var/spool/clientmqueue
17479 root 7120 kB /usr/sbin/sshd
32654 root 5568 kB /usr/sbin/saslauthd -m /var/run/saslauthd -a pam -n 2
32655 root 5568 kB /usr/sbin/saslauthd -m /var/run/saslauthd -a pam -n 2
32644 root 4396 kB crond
17631 root 3608 kB /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --socket=/var/lib/mysql/my ...
32594 root 2716 kB xinetd -stayalive -pidfile /var/run/xinetd.pid
7794 nobody 2480 kB proftpd: (accepting connections)
11909 root 2144 kB /sbin/udevd -d
1 root 2060 kB init [3]
32556 root 1716 kB syslogd -m 0
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Oct 21, 2009
i have a vps and its quite a new one since i just ordered it and transfered everything from my previous..
But im getting really high cpu useage and im wanting to know whats best ways to optimize this...
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Oct 26, 2009
This question is for owners who sell their own VPS services.
Can anyone tell me a 'rough' estimate of what their average setup users purchase from you? Or perhaps a top 3 of your setups?
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Oct 27, 2009
right time to upgrade your web server in regards to CPU Usage?
Is there any point that you can determine CPU processing is not good enough to handle the requests.
IE - If you see the CPU spiking to 100% time to time, is this a good sign to think about upgrading?
Heres a screenshot of my current webserver CPU usage, does this look really bad?
[url]
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Jun 2, 2009
I'm just wondering what exactly "CPU Time" is, I have searched Google and checked Wikipedia but still do not really understand. The main reason this is bugging me is that MySQL on our database server seems to have a very high "CPU Time" usage.
This is the top part of the output from "top", with MySQL shown:
Code:
[mike@mysql1 ~]$ top
top - 20:26:05 up 222 days, 16:14, 1 user, load average: 2.04, 2.90, 2.36
Tasks: 95 total, 1 running, 94 sleeping, 0 stopped, 0 zombie
Cpu(s): 27.1%us, 12.1%sy, 0.0%ni, 60.2%id, 0.3%wa, 0.0%hi, 0.2%si, 0.0%st
Mem: 2074276k total, 1990828k used, 83448k free, 163012k buffers
Swap: 4192956k total, 60k used, 4192896k free, 1410448k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
26826 mysql 25 0 483m 324m 5504 S 238 16.0 363300:21 mysqld
1 root 15 0 2064 592 508 S 0 0.0 0:01.24 init
2 root RT -5 0 0 0 S 0 0.0 1:13.13 migration/0
3 root 36 19 0 0 0 S 0 0.0 0:00.00 ksoftirqd/0
4 root RT -5 0 0 0 S 0 0.0 0:00.00 watchdog/0
5 root RT -5 0 0 0 S 0 0.0 0:01.17 migration/1
6 root 34 19 0 0 0 S 0 0.0 0:00.00 ksoftirqd/1
7 root RT -5 0 0 0 S 0 0.0 0:00.00 watchdog/1
8 root RT -5 0 0 0 S 0 0.0 5:34.93 migration/2
9 root 34 19 0 0 0 S 0 0.0 0:00.00 ksoftirqd/2
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Aug 9, 2008
How many of you use RBL/CBL checks on your email servers?
I've generally stayed away from them because of the chance of them having false positives, but have been meaning to try them for a while. With spam becoming a larger and larger problem, and the lists getting more and more mature, I figure they can't do anything but help.
I'm very surprised at the difference they made, and I've attached a graph to demonstrate the difference.
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Jun 11, 2008
I ran a TOP command on my two servers but i really dont understand the output ... could someone please explain...
i specially and really really need to under the memory and cpu usage of the servers.
please could someone explain what cpu and mem values really are ... example what is 98.0% us, 0.0% ni, 0.0% wa, 0.2% si etc... as shown besides Cpu(s) and what is 183100k buffers in the Mem
how are the server loads calculated?
+++++++++ Server 1 +++++++++
top - 00:54:09 up 12 days, 1:10, 1 user, load average: 20.64, 15.69, 10.83
Tasks: 138 total, 21 running, 117 sleeping, 0 stopped, 0 zombie
Cpu(s): 98.0% us, 1.7% sy, 0.0% ni, 0.0% id, 0.0% wa, 0.2% hi, 0.2% si
Mem: 2005856k total, 1767704k used, 238152k free, 183100k buffers
Swap: 2040244k total, 128k used, 2040116k free, 810588k cached
+++++++++ Server 2 +++++++++
top - 00:54:59 up 67 days, 23:03, 1 user, load average: 0.10, 0.07, 0.02
Tasks: 122 total, 1 running, 121 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0% us, 0.2% sy, 0.0% ni, 99.8% id, 0.0% wa, 0.0% hi, 0.0% si
Mem: 2005396k total, 1948624k used, 56772k free, 53848k buffers
Swap: 2040244k total, 144k used, 2040100k free, 1499772k cached
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