Questions tagged [cpu-usage]
The amount of processing units of the CPU used to execute a task and how long it takes.
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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?
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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 ...
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High CPU utilization but low load average
We are running into a strange behavior where we see high CPU utilization but quite low load average.
The behavior is best illustrated by the following graphs from our monitoring system.
At about 11:...
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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 steal ...
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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 ...
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How are CPU time and CPU usage the same?
In the Wikipedia page for CPU time, it says
The CPU time is measured in clock ticks or seconds. Often, it is
useful to measure CPU time as a percentage of the CPU's capacity,
which is called ...
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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, ...
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"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 ...
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Kill process with high CPU usage after X time? [closed]
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 ...
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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)
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kswapd often uses 100% CPU when swap is in use
Most of the time when my computer starts to need swap, I see a massive spike in CPU usage (kswapd0 is consistently using 99%-100% CPU). According to top, the time is spent in sy (system/kernel) not wa ...
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Taskset not working over a range of cores in isolcpus
To preface I'm using Debian Wheezy with kernel 3.2 on an AMD64 chipset. My machine has two Xeon E5-2690 cores. I set up the boot parameters so that all the cores on one CPU are dedicated to a single ...
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How often do you restart a heavily-utilized Windows Server 2008R2 Remote Desktop Server (VM)?
Note: I've read How Often Do Windows Servers Need to be Restarted? but this question pertains to our Remote Desktop server specifically.
We have a Windows Server 2008R2 server - a VMware ESX VM - ...
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Use of CPUQuota in systemd
I am trying to put a hard limit in CPU usage for a dd command . I have created the following unit file
[Unit]
Description=Virtual Distributed Ethernet
[Service]
ExecStart=/usr/bin/ddcommand
...
16
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1
answer
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How to start a program when CPU percent reaches X
I have been having very intermittent problems with an ASP.NET v 4.0 application happens maybe ever 4 days, what happens is the CPU will spike to 75% and sometimes is will run fine until the end of the ...
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stress-ng: Simulate specific cpu percentages
Linux environment: Debian, Ubuntu, Centos
Goal:
Test monitoring program that set alarms and trigger different alarms at different cpu percentages.
ex: (30-50%), (51-70%) and >90%
So I need a cpu ...
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MySQL process goes over 100% of CPU usage
I'm experiencing some problems with my LAMP server. Recently everything became very slow, even though visitor count on my websites didn't change to much. When I run top command, it says that MySQL ...
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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 ...
13
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4
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ps aux hanging on high cpu/IO with java processes
I'm having some issues with java process and nrpe checks. We have some processes that sometimes use 1000% cpu on a 32 core system. The system is pretty responsive until you do a
ps aux
or try to do ...
13
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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 ...
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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 ...
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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 + ...
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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 ...
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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 ...
12
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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.
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5
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IIS App Pool High CPU usage despite no requests
I have recently migrated a set of Windows Server 2008 R2 / IIS 7.5 servers to new servers running Windows Server 2012 / IIS 8.
I am experiencing some odd behavior from IIS. We have 2 identical ...
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3
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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 example:...
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Do CPU credits exist for c5d.large instances? And if not, why not?
I've been paranoid that the websocket feed I was listening to on a t3.micro instance was being inhibited by cpu steal time from other instances under the same hypervisor.
So I switched over to a c5d....
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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 ...
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How to check gpu usages on aws ec2 gpu instance?
I'm running a ubuntu gpu instance on AWS ec2. I'm not sure if my application is using gpu accelerations. So how to check gpu usages on aws gpu instance?
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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 ...
8
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3
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How can I monitor CPU usage and processes on Windows Server 2012 as a service over a 24 hour period?
We have a long running performant operation that runs for 6 hours. When it was last ran, something happened for 5 minutes where its performance dropped dramatically and caused a few timeouts, in the ...
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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 ...
8
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1
answer
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Windows Servers on ESXi 100% CPU at year rollover
We have a number of Windows Server 2008 R2 SP1 servers running on ESXi servers. At year end rollover 2014 to 2015 the CPUs go to 100% and the machines hang.
The solution appears to be a hotfix (...
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vCPU performance between 1 or 2 vCPU's
Within virtualisation (Predominantly VMware) is there a performance advantage using either 1 CPU with 4 cores or 2 CPU's with 2 cores? Let's assume the application running on a VM can use two CPU's.
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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 ...
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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 ...
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Why do user and system cpu in cpuacct.stat not add up to cpuacct.usage?
Question relates to Linux cgroups cpu accounting.
I noticed this at the container level, but it persists up to top level. For instance:
# cat /sys/fs/cgroup/cpu/cpuacct.stat /sys/fs/cgroup/cpu/...
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Right way of measuring overlay network performance
I am currently examining the performance (especially UDP throughput) of different Docker overlay networks. I do this by creating point-to-point connections between two hosts that are connected with a ...
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How to compare mainframe CPU performance?
I am working with an application that runs on tomcat in OMVS. It run terribly on one mainframe, and adequately another another. Is there a way I can compare the CPU of the two mainframes as a ...
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Need help trouble shooting high CPU usage by PHP-fpm
There is a problem that is driving me crazy. After the day I tried to fix the CPU usage problem of my VPS, the CPU load has grown from 60% to 150%, and I have no idea what causes the problem. Please ...
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How is RAM and CPU allocated if no manual changes are applied to an Ubuntu Server
We have an Ubuntu Server (16.04) running R-Studio Server where we do statistical simulations. Those simulations are sometimes heavy on RAM and CPU so i would like to know how memory and RAM is ...
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cpufreq-info differs from /proc/cpuinfo?
I have a server and I want to ensure it's always running at maximum speed, never in energy-saving mode. I've tried a few strategies (aside from rebooting and changing the setting in the bios, which I ...
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How to find what processes were running at a time in the past?
I am asked to investigate a high CPU usage alert which occurred this morning. I used sar -p and saw the high CPU usage showing up at that time
Next I used ps -eo pcpu,pid,user,args | sort -r -k1 | ...
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Intermittent high CPU (100%) on production webserver
X-Post from StackOverflow:
https://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.
...
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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 ...
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CPU overloaded but no proccess is using more than 1% [duplicate]
I am monitoring a Cpanel (centos) server which have a 2-core CPU (4 virtual CPU cores) and it seems to be overloaded because I got this values using top:
load average: 11.80, 13.30, 13.02
Cpu(s): 42....
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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
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5
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CPU's on Hyper-V host system is just idling, even though VM's are at full throttle
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 ...
6
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2
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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 graph ...