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18
votes
2answers
2k views

Is there a Windows equivalent of Unix 'CPU steal time'?

In order to assess performance monitoring accuracy on virtualization platforms, the CPU steal time has become an increasingly relevant metric - see EC2 monitoring: the case of stolen CPU for an ...
16
votes
3answers
371 views

“Peaky” CPU Usage on Domain Controllers

We have two Windows Server 2008 SP2 (sadly not 2008 R2) Domain Controllers in a small 150 client domain that are exhibiting very "peaky" CPU usage. The Domain Controllers both exhibit the same ...
11
votes
4answers
3k views

Why is 1 of my 24 CPUs Pegged at 100%?

I have an HP ProLiant DL380 G7 system using 2 6-core CPUs, with Hyper-threading enabled, for a total of 24 logical CPUs (as seen by Windows). When running our application, total system CPU ...
11
votes
4answers
6k views

Linux CPU usage and Process Execution History

Is there any way to see what process(es) caused the most CPU usage? I have AMAZON EC2 Linux which CPU utilization reaches 100 percent and make me to reboot the system. I cannot even login through SSH ...
11
votes
10answers
5k views

What creates CPU I/O wait but no disk operations?

I have CPU I/O wait steady around 50%, but when I run iostat 1 it shows little to no disk activity. What causes wait without iops? NOTE: There no NFS or FUSE filesystems here, but it is using Xen ...
11
votes
3answers
6k views

What does %st mean in top?

Here is an example from my top: Cpu(s): 6.0%us, 3.0%sy, 0.0%ni, 78.7%id, 0.0%wa, 0.0%hi, 0.3%si, 12.0%st I am trying to figure out the significance of the %st field. I read that it means ...
10
votes
4answers
17k views

What does 'nice' mean on CPU utilization graphs?

On Ubuntu server load graphs I see 4 types of CPU consumption: User, System, Nice and Idle. What does Nice type mean?
9
votes
3answers
3k views

Why is my router CPU at 40% when no processes use more than 2%?

I have a problem, I have a Cisco 1841 running Cisco IOS 15, and I get strange behavior. The CPU usage is shown as 40%, but there is no processes that is using this much CPU power. Here is an ...
8
votes
2answers
4k views

How to monitor CPU usage and performance on a Hyper-V server with several VM's

I have a server that is running Windows 2008 64 bit Hyper-V, with 8 gigs of RAM and Intel Xeon X3440 @ 2.53 Ghz, which gives me 8 logical cores in the performance monitor on the host system. I have ...
7
votes
3answers
6k views

Kill process with high CPU usage after X time?

running linux i have a few processes which tend to crash occasionally (game servers), which end up using 100% cpu. I'm looking for a program or script to check the cpu usage of a list of processes by ...
7
votes
5answers
14k views

TrustedInstaller.exe takes a lot of CPU

Does anyone know how to fix issue with TrustedInstaller.exe when it takes a lot of CPU? Operating system: Windows 2008 x64 Windows' Modules Installer service is set to Manual.
6
votes
5answers
9k views

check history of cpu/memory usage in ubuntu?

Is there a way for me to review cpu or memory usage on my ubuntu linux server? I've noticed my server (lamp set up) being slow at times, but by the time I log in as root and run a PS command, ...
6
votes
3answers
2k views

When is sustained 100% CPU utilization not a worry?

Please help refine a discussion going on in our shop. Consider the following scenario. There is a Microsoft VPC running several apps and services (Windows 2003 server). The server has two or three ...
6
votes
5answers
1k views

SQL Server suddenly using only a small portion of CPU

We've got a Windows 2008 R2 server running SQL Server 2008. All of a sudden, the SQLServer process is refusing to go above 20% CPU usage. As of last week, when running a heavy query against the db it ...
6
votes
2answers
753 views

Prioritise ssh logins (nice)

Is there a preferred way to set "nice" for sshd? I need priority given to sshd such that I can login and easily fix stuff when something has gone wrong (eg DoS, badly behaved processes, etc)
6
votes
1answer
650 views

Very uneven CPU utilization with SQL Server 2012 on 2 processor computer with 16 cores / processor

After installing SQL Server Enterprise 2012 with the Server + Cal license model, on a computer with 2 processors each with 16 cores (and no hyperthreading involved) and putting the server under ...
5
votes
3answers
844 views

Is there a way to calculate the percentage CPU utilization by reading /proc/stat at once?

I guess the question is, could I somehow calculate the CPU utilization percentage just by reading the /proc/stat once? # head -1 /proc/stat cpu 67891300 39035 6949171 2849641614 118251644 365498 ...
5
votes
2answers
580 views

CPU allocation for VMs on ESXi

I'm a complete VMware know-nothing, but I recently set up 4 VMs on ESXi. 3 of the VMs are very non-resource-intensive (a lightly used file server, a lightly used domain domain controller, and a VMware ...
5
votes
4answers
1k views

Random high CPU usage on Linux using Apache

I've recently had a bit of a strange problem with my web server. Over the last day or so the site seems to be slowing down somewhat at random intervals, we don't seem to be experiencing any major ...
5
votes
2answers
3k views

Monitor and graph CPU usage per process and per thread

I need to monitor CPU usage by a given process and each of its threads. For each of them I want to have: average and maximum CPU usage percent, total CPU time used during the captured period, a ...
4
votes
4answers
2k views

CentOS - High CPU Usage at a particular time in the night

I have a CentOS-5 server that has very little load. A typical output of "sar" command shows like this: 02:20:01 PM CPU %user %nice %system %iowait %steal %idle 02:30:01 PM ...
4
votes
1answer
586 views

CPU% more than 100 in ps -aux

We use ps -aux to find out when tomcat process takes high CPU utilization, if that so we will send a alert to Group. But some times %CPU shows more than 100, but our application working fine. Is it ...
4
votes
1answer
548 views

How does a CPU ever go Idle enough to enter deeper C states?

Even if no user process is running, don't the kernel processes keep the CPU active enough so as to prevent it from entering a deeper C state like C1 or C2 ?
4
votes
3answers
4k views

Intermittent high CPU (100%) on production webserver

X-Post from StackOverflow: http://stackoverflow.com/questions/9465123/intermittent-high-cpu-100-on-production-webserver We have a web cluster with 3 web-servers, each with 24 cores & 24GB mem. ...
4
votes
4answers
5k views

How can I investigate sustained high CPU usage by Microsoft.Exchange.Rpc.ClientAccess.Service.exe?

One CAS server in our array has nearly 90% of its 4 CPUs used. The remaining CAS servers are at 30 percent. How should I investigate what is causing this increase? Below is a graph of: Six ...
4
votes
1answer
5k views

How can a Perfmon “% Processor Time” counter be over 100%?

The counter, Process(sqlservr)\% Processor Time, is hovering around 300% on one of my database servers. This counter reflects the percent of total time SQL Server spent running on CPU (user mode + ...
4
votes
5answers
9k views

Why is idle windows VM using so much CPU?

I have 2 VMs running as guests on a KVM virtualization platform running on Ubuntu 10.04. One VM is an Ubuntu 10.04 system, the other is a Windows 7 system. When both machines are completely logged ...
4
votes
1answer
478 views

How is load average related to CPU utilization?

I am facing a load average of > 3 since past 2 days. The CPU utilization is never above 40 % in all cases. Here are some screenshots of Server Density monitoring tool that I use. The process ...
4
votes
4answers
2k views

Graphing per-user CPU usage on a Linux machine

I want to graph (graphical output would be great, i.e. a .png file) the following situation: I have users A, B, and C. I limit their resources so that when all users run a CPU intensive task at the ...
4
votes
1answer
615 views

Linux Cumulative User, System CPU Usage of Running Process?

On Linux (and other Unix-like OS's if there's a general answer), is there an easy way to get an output similar to the time command (current real time, user, and system CPU usage totals) for a process ...
4
votes
1answer
915 views

VMWare - High CPU utilization on Windows 7 guest VM

I've just added some Windows 7 virtual machines to an existing VMWare vSphere 5.1 cluster. The hosts and vCenter are 5.1 with current updates via Update Manager. Looking at the vSphere client ...
4
votes
1answer
105 views

mongo and app server cpu

The beginning: We are using uwsgi and I decided to switch our configuration to use more workers/processes. Why: We have been seeing a traffic increase lately and in my tests with apache benchmark, ...
3
votes
2answers
599 views

Can an ESX server under heavy load cause cpu spikes on guest VM's?

So we have a number of vm's running on an ESX 4.1 server for product testing. The ESX Server is at times under heavy load. We've been experiencing high CPU levels during some use cases, but we can't ...
3
votes
3answers
441 views

Running bash script with php under lower priority or limit CPU

I have a bash script which runs a set of php scripts. When it runs it takes an hour and pegs the CPU at 95-99%. This causes our lamp stack (mainly the apache process) problems and our website on the ...
3
votes
2answers
2k views

CPU load too high. How to investigate?

This is my "top" screen. Now it's 2.96. Sometimes it goes above 3! I've read that it's not good. How to investigate and fix it?
3
votes
2answers
2k views

Java eats %100 cpu up

I got this CentOS server in which a Java WebApp (Tomcat6+Hibernate+MySQL+Struts2) is being run. Usually cpu usage is about 10% but sometimes all of a sudden it goes to 100% and the application ...
3
votes
1answer
4k views

Erratic CPU usage by mscorsvw.exe (.NET Runtime Optimisation Service)

I have a Server 2008 R2 Terminal Server that's just been kinda sitting around for the last three months with very, very low usage (perhaps 1 user for an hour, once a day). All of a sudden, for no ...
3
votes
2answers
1k views

Dual Quad Core Xeon CPU but still high load

I have a dedicated server with following specs: Two Intel Xeon-Harpertown 5430-Quadcore[2.66 Ghz] 4GB DDRII RAM 500GB SATAII HD CentOS 5.5 64-bit Problem is that even with such specs MySQL still ...
3
votes
3answers
1k views

Artificially burden the CPU

I'm looking for a command line application that will artificially burden the CPU. It needs to be better than just a busy loop. We're testing how the system holds up under heat stress and the CPU ...
3
votes
4answers
302 views

limit cpu ocupation for script

How can I limit a cpu usage to my backup script. It does a mysql db dump and backup of my www directory then bzip2 everything, but it takes a bit and during this time a cpu has 100% load. Can I ...
3
votes
1answer
2k views

Disabling CPU management

If I add the following processor.max_cstate=0 to the kernel command line for boot up, does that disable all CPU power management and throttling? I also found: ...
3
votes
5answers
3k views

What's going on with my server? High load, lots of idle CPU time, low disk utilization

I run a web site and send a legitimate opt-in, daily email newsletter to subscribers. Both the web hosting and email sending are done by the same machine. I have about 100,000 subscribers who have ...
3
votes
1answer
450 views

100% kernel load on FreeBSD 9

I'm having problems with a FreeBSD 9 server. One of the 8 cores (4 w/ HT) is constantly at 100% kernel load. top gives me: CPU: 0.0% user, 0.0% nice, 12.5% system, 0.0% interrupt, 87.5% idle ...
3
votes
2answers
249 views

Load average at 1, even though I've stopped all services!

I have a virtual server running Debian 5 where any action is very slow (like password verification when logging in via SSH or doing su). I checked the load average, which is hovering around 1-2. Then ...
3
votes
4answers
3k views

Caching DNS server (bind9.2) CPU usage is so so so high

I have a caching-only dns server which get ~3k queries per second. Here is specs: Xeon dual-core 2,8GHz 4GB of RAM Centos 5x (kernel 2.6.18-164.15.1.el5PAE) bind 9.4.2 rndc status: recursive ...
3
votes
1answer
1k views

Amazon EC2: how to find out detailed CPU usage?

I am running several EC2 instances, and I want to know the exact work my CPU is doing. On "normal" machines I am doing this with munin and its CPU plugin which looks at the statistics provided by ...
3
votes
1answer
337 views

Getting CPU steal times on Ubuntu 11.4 Virtual Box

I'm trying to check on CPU steal times in a virtual machine. The goal is for me to be able to detect if my app is running in a VM on over-committed hardware. I'm currently just testing, in ...
3
votes
2answers
2k views

IIS w3wp using high cpu with no traffic

I am seeing the following suspicious behavior on one of our web servers (IIS 6.0 on win2k3). two CPUs hyperthreaded into 4. In task manager and perfmon the w3wp.exe's cpu utilization does appear to ...
3
votes
0answers
91 views

Growing OS cache in RAM causing high system CPU usage

Long question, so please bare with me: I'm having a weird issue with a server that I've never seen before. On a machine with ~30G of RAM with an application that takes ~10G (spread across hundreds of ...
3
votes
0answers
79 views

How to investigate the cause of a 100% CPU event that lasted for hours?

Yesterday the CPU on my Xen-based VPS server went to 100% for two hours and then went back to normal, seemingly naturally. I have checked logs including syslog, auth.log and more and nothing seems ...