27
votes
1answer
917 views

Is it possible to influence the way CPUs are enumerated under Linux?

I have a HP DL380 G7 with 2 unequal CPUs in it. One is a quad core CPU with faster cores, and one is a 6 core CPU with slower cores. On this box I run an application that due to licensing reasons ...
0
votes
4answers
51 views

Proper way of interpreting system load on a 4 core 8 thread processor

As we all know, load of 1.00 on a single processor means that there is a load of 100%. Analogically a 4.00 load on a quad core would be 100%. How should I interpret load on a 4 core 8 thread ...
0
votes
0answers
26 views

Dell Poweredge R410 does not recognize second CPU

I have a Dell Poweredge R410 with two CPUs installed. I tried everything but the second CPU does not get recognized by the BIOS or the Linux Operating System it has. Both CPUs are Intel Xeon E5602 ...
1
vote
1answer
33 views

Historical CPU Utilization by Service Name In RHEL 6.2

I need to implement historical CPU Utilization by service name in Linux Red Hat 6.2. Is there any software or command which can provide such details ?
0
votes
0answers
16 views

SNMP OID for CPU model information

I am currently trying to find the oid / way to gather the CPU model name from a server using SNMP. I have tried looking up the specific oid for it however all I could find were ones that related to ...
1
vote
1answer
51 views

Limit user to N CPU cores

I want to limit a user on my system to only be able to use one core of my system. After searching, I found this, but I can't figure out how to use it. I would also like to limit the use of that core ...
-1
votes
2answers
207 views

Best type of virtualization when CPU has more threads than cores

I have a 4 cores/8 threads Intel Xeon processor. This is something I tried to particularly ask in SolusVM support, however I haven't got a good reply. I even don't know if they are right: they told me ...
0
votes
1answer
57 views

lsof getting ran by root, but not by a user and using high CPU usage

My server is using high CPU usage from lsof, and it appears to be ran randomly and by the root user. I'm finding this out via Newrelic information Is it at all possible to find what is running this ...
3
votes
1answer
2k views

Centos 6.5 crashing with kernel panics

I recently built a small cluster for running Solr. The cluster consists of 12 Supermicro Blades running E3-1270V2 with 32GB of ram. 11 of these servers are running fine. One of them crashes on me ...
1
vote
2answers
77 views

/sys/kernel/debug/tracing/per_cpu shows way more cpus than I have

I have 8 logical CPUs in my linux box. (As seen from /proc/cpuinfo). When I look in /sys/kernel/debug/tracing/per_cpu it shows 32 CPUs. Why the difference? If it matters, I have hyperthreading ...
0
votes
1answer
76 views

Cloning a server across architectures

I have this Linux (Debian) server that I want to duplicate, with all its services and their settings. Actually, it is to replace the existing server with newer hardware. I'd like the process to be as ...
1
vote
1answer
237 views

Directadmin Apache server finetuning advice

I currently have a dedicated server from which I provide shared hosting for some clients of mine. Server specs AMD Athlon(tm) 64 X2 Dual Core Processor 4000+ 4GB DDR RAM 1x Seagate ...
3
votes
1answer
37 views

Events/1 and Server Interrupts

Currently I am seeing a lot of CPU usage on events/1 and I was wanting to know how to figure out what is causing that? cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 ...
0
votes
1answer
106 views

Trading Engine running on RHEL 5.x [closed]

Before asking question quick background about myself working at one of trading company this is my 1st job as sysadmin I have finish my RHCE no experience how production server work. In our company ...
0
votes
3answers
438 views

Linux server became extremely slow

I have a file sharing website, and my files hosted in a server with those system specifications: 32GB RAM 12x3TB 2x Intel Quad Core E5620 I have files in this server up to 4gb for each file. 446gb ...
0
votes
0answers
251 views

ksoftirqd causes very high cpu usage - server is sometimes completely unusable

the ksoftirqd process on my root (Ubuntu 12.04 x64 with kernel 3.11.6) causes occasionally a very high usage of the first cpu core (sometimes only 5 minutes, then 30 minutes long, ... it feels just ...
0
votes
1answer
163 views

pbs check how much cpu a job is using / job % cpu usage

On a cluster a job is submitted to run on N CPUs. qstat -f doesn't show how much CPU resources the job is using other than the time. How does one check whether 100% of each CPU power is used? It is ...
0
votes
0answers
115 views

Xen Kernel - Only One Core Showing

So I have a dedicated server running the Xen kernel but for some reason it only shows one core instead of 4? Does that mean that my VPS that is running is only getting access to the 1 core or do they ...
4
votes
1answer
153 views

Artificially Generate CPU Steal

Anyone know of a good way to artificially generate CPU steal? I have some automation I want to test which is triggered by CPU Steal, but for the life of me I can't figure out how to force CPU Steal ...
0
votes
1answer
300 views

Linux get CPU cache hit ratio

AFAIK a lot of modern CPUs have counters for memory cache misses/hits. Is there an API/program which can query this? Is there a way to reset the counters? I'm interested in any generic or CPU ...
1
vote
1answer
207 views

Total CPU usage Object ID?

How can i find the correct OID to get the total cpu usage of my Checkpoint (linux) based firewall? with 8 cores CPU. I found this : ssCpuUser .1.3.6.1.4.1.2021.11.9 ssCpuSystem ...
0
votes
1answer
466 views

High Apache CPU usage, but low nginx - Configured correctly?

We've just moved a website of ours over to a brand new high-spec Linux server (1x Intel Xeon E3-1230 v2 @ 3.30GHz, 8GB DDR3 ECC, 2x 128GB SATA SSD RAID1). The server has been configured to use nginx ...
0
votes
0answers
115 views

Softirq has raisen without reason

Monitoring munin stats I found that on CPU's graph there was softirq value increased. What might be the reason? Currently I am experiencing problems with mysql cpu consumption. But how those things ...
0
votes
1answer
573 views

How can I diagnose and fix frequent 100% cpu utilization from kernel?

I have an Amazon EC2 micro instance running an old 2.6.16 kernel. It runs postfix, apache, and mysql. During normal loads, it's load average is around 0.05, and it runs this way 95% of the time or so. ...
0
votes
0answers
61 views

How to investigate Linux scheduler issues?

I have a Linux server process that should runs multiple threads at close to 100%, each on its own CPU. When I run the process on one server (see [1] below), the CPUs in question appear to stay pegged ...
0
votes
1answer
232 views

Understanding CPU Throttle

kernel /vmlinuz-2.6.32-379.22.1.lve1.2.17.el6.x86_64 ro root=UUID=7cb0b445-0f63-4ef1-ab73-93c114d8ef6c rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto ...
1
vote
1answer
344 views

Two CPU cores at 100% utilization after soft lockup on two CPUs, is this normal?

I had two of my CPUs lock up on one of my servers. From dmesg: BUG: soft lockup - CPU#1 stuck for 23s! [vmx-vcpu-0:6148] and later: BUG: soft lockup - CPU#2 stuck for 23s! [vmx-vcpu-0:6148] I'm ...
0
votes
0answers
52 views

High load cause? [duplicate]

Possible Duplicate: what is my server high load cause (4 cores and 8 thread cpu) What is my high load cause? CPU,RAM or IO? 4 Core, 8 thread cpu top - 22:27:07 up 149 days, 5:26, 1 ...
0
votes
0answers
445 views

Ubuntu 12.04 64bit - What would cause high System CPU %sys during high MySQL loads?

128GB RAM, 32cores Xeon RAID 10 SSD. Mysql version is the latest 5.5 for Ubuntu 12.04 . We have a lot of queries - about 1800+ per second. During high MySQL load - 2700+% load on a 32 CPU system - ...
0
votes
3answers
267 views

Linux: One cpu core is always in 0 use

Today I notice a very strange thing. One cpu core is always in 0 use . Is it a bug? Cpu0 : 0.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi,100.0%si, 0.0%st Cpu1 : 37.7%us, 44.4%sy, 0.0%ni, ...
2
votes
1answer
449 views

Monitoring usage resources per user in Linux

I want to get statistic hourly by used averages resources per user such as cpu and memory. How I can get it?
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: ...
0
votes
1answer
249 views

HIGH CPU USAGE + low memory usage

As you can see in below, Apache is using a high amount of CPU. PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 28577 apache 15 0 99676 53m 3488 S 21 0.2 1:13.67 httpd ...
3
votes
5answers
2k views

CPU?: Not responding

I'm attempting to build a system for co-location. I've been running into issues while trying to install CentOS 6.3 System Specs: Motherboard: ASUS m5a99x Process: AMD FX-8120 (8-core Bulldozer) ...
1
vote
2answers
254 views

how to control system load of a particular process? eg. Java

So Java has been hanging our systems. Our developers are still looking into this but as an Admin what can be done. On a dual socket system with altogether 8 cores, Load peaks at 40's.. On average ...
2
votes
1answer
441 views

EC2 Amazon Linux AMI MySQL CPU @ 62% When Idle?

I am running MySQL on an Amazon Linux AMI. There is nothing connected to it. There are no connections and no other applications running that use MySQL. It is completely idle, but yet, top is reporting ...
4
votes
2answers
531 views

Is It Possible to set cpu affinity for particular user?

I mean is their any way we can set up cpu affinity for particular user, for all his currently running process or for process which he will start later?
4
votes
1answer
218 views

Apache HTTPD process cumulative cpu time

How can I aggregate all Apache HTTPD processes' CPU time usage to be able to compare them with other running processes' (MySQL, Java, ...)? Or how much CPU time does HTTPD needs compared to MySQL for ...
4
votes
3answers
6k views

How does top calculate CPU usage on a Linux system with a single core?

How is CPU usage calculated on a Linux system with a single core? Cpu(s): 28.1%us, 6.5%sy, 0.0%ni, 43.0%id, 21.6%wa, 0.0%hi, 0.5%si, 0.2%st Please explain me how the us, sy, ni, id, wa, hi, si ...
2
votes
3answers
2k views

Diagnosing high CPU waiting

I have a monitoring server that is running icinga/collectd/graphite with about 50 hosts. I have noticed high load/slugging performance on the box. If you take a look at top, you'll see: Cpu(s): ...
0
votes
3answers
731 views

find Intel Processor Number for my cpu in linux

How to find out the Intel Processor Number for my CPU model on linux ? I bought a server from a webhosting company and I don't know which CPU model it has. I only know it is a Pentium D , dual core. ...
-3
votes
1answer
52 views

Server configuration notation [closed]

What is the industry standard to specify Virtual machine configuration in a summary format? I have seen notations like these: 4 CPU x 8 GB RAM VM
2
votes
3answers
2k views

Very high CPU and low RAM usage - is it possible to place some of swap some of the CPU usage to the RAM (with CloudLinux LVE Manager installed)?

I had to install CloudLinux so that I could somewhat controle the CPU ussage and more importantly the Concurrent-Connections the Websites use. But as you can see the Server load is way to high and ...
0
votes
2answers
369 views

debian zero cpu usage on process stat

I use debian linux debian 6 (Linux 2.6.32-5-amd64 on x86_64) and if I query the process stat list (ps or top) every process has zero cpu usage. If I query the apache stat there is also zero cpu usage. ...
1
vote
2answers
1k views

Linux Scheduler (not using all cores on multi-core machine) RHEL6

I'm seeing strange behavior on one of my servers (running RHEL 6). There seems to be something wrong with the scheduler. Here's the test program I'm using: #include <stdio.h> #include ...
4
votes
3answers
307 views

Windows time command equivalent

There is a command in Linux that outputs system utilization called time. Is there a Windows equivalent? Or how else can I manually use the task manager commands in a batch file?
0
votes
1answer
395 views

top command occupied high cpu usage

My system is SUSE 10 and I observe that top occupies 57% CPU usage when I use it. I don't have too many processes: ps -eLf | wc -l 106 Here are top's stats: cat /proc/2913/stat 2913 (top) R ...
11
votes
10answers
6k 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 ...
2
votes
2answers
311 views

Linux load averages and possible danger?

I have an box I built out of some parts I have around my office. I used an old Intel Core CPU (not core2) @2.0ghz with 2 cores. The box is running Ubuntu 11.10 64-bit server edition, it serves as my ...
0
votes
2answers
1k views

Force a process to use a particular cpu core? [duplicate]

Possible Duplicate: Is it possible to limit a Linux process so that it can only run on a particular core on a particular machine? I would like to know how can I bind a process to a ...