Questions tagged [load-average]

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17
votes
1answer
4k views

How does a CPU know there is IO pending?

I have been looking into the iowait property shown in top utility output as shown below. top - 07:30:58 up 3:37, 1 user, load average: 0.00, 0.01, 0.05 Tasks: 86 total, 1 running, 85 ...
15
votes
4answers
23k views

Why/how does “uptime” show CPU load >1?

I have a 1 core CPU installed on my PC. Sometimes, uptime shows load >1. How is this possible and what does this mean? EDIT: The values go up to 2.4
14
votes
3answers
20k views

How is the “load average” interpreted in “top” output? Is it the same for all distributions?

I would like to know if the output of a Red-Hat based linux could be differently interpreted by a Debian based linux. To make the question even more specific, what I am after, is understanding how ...
7
votes
2answers
11k views

High load average: Which processes are waiting in the queue?

I have an Ubuntu server running Redis, which suffers from a high load problem. Forensics Uptime # uptime 05:43:53 up 19 min, 1 user, load average: 2.96, 2.07, 1.52 sar # sar -q 05:24:00 AM ...
3
votes
2answers
1k views

CPU and Load Average Conflict on EC2 server

I am having touble understanding what server resource is causing lag in my Java game server. In the last patch of my game server, I updated my EC2 lamp server from apache2.2, php5.3, mysql5.5 to ...
3
votes
1answer
2k views

How is load average calculated on FreeBSD?

On Linux, the load average is the average number of processes that are either runnable or waiting averaged over the past 1, 5 and 15 minutes. On OpenBSD (and possibly other BSDs, but neither the ...
3
votes
3answers
2k views

Check what process is spiking the average load with atop

In trying to find the culprit of a high load average on a system during night (which does not seem to be related to logrotate) I installed atop to write a raw file with a specific interval. While ...
2
votes
4answers
8k views

Get per-core CPU load in shell script

I need to report the CPU load per core as a percentage from a shell script, but I cannot run e.g. mpstat for one second. Basically I think that the infos top is showing after pressing 1 is what I want,...
2
votes
2answers
62 views

How to calculate n values in a column and the overall average?

I would really appreciate some help with this as I am relativity new to Linux. I'm using grep but I also want an average of all of my extracted values (irrespective of which column they are in) and ...
2
votes
2answers
732 views

How to limit the load average

Question : How can I limit the load average so it does not excess a certain number? I am on a debian 4.7 (wheezy). Context : I rented a vps some time ago (4 cores) so I can run some computations, ...
2
votes
2answers
765 views

Why is the range of load average not 0-1+ for all cpu's together?

I know that load average is 0-1(or 0-1024) per cpu. E.g a busy quad-core can have a load average of 4.0 or higher. (e.g if there are many tasks). I understand it can be huge like 100+ etc. I also ...
2
votes
1answer
1k views

Is an LXC guest load average the same as the host's load average?

If I run top on the guest, the load average values seem to be exactly the same as running top on the host. Is a Docker (LXC) guest's load average the same as the host's load average?
2
votes
1answer
278 views

kvm_open: cannot open /proc

I have 100+ boxes running FreeBSD 8.4 amd64 RELEASE (p9) with the same configuration. And only one of them sometimes behaves strangely: load average (generally 4~6, it's ok course box have 8 CPU ...
2
votes
1answer
1k views

Htop load average 30

I'm running an application which, for now, uses the bakery algorithm for syncronizing n processes, but with this method I do a lot of busy waiting on my CPU, in fact as you can see from the title, I ...
2
votes
1answer
104 views

Openvz resource management

I have a couple of nodes ( which are not mine ) running one openvz kernel version -2.6.32-042stab092.2 specifications : processor model name : E5-2620 0 @ 2.00GHz Number of Processors : 24 RAM : 48G ...
2
votes
1answer
55 views

Reproduce load average calculation

I am digging into calculation of LA. So, what have I found: LA calculates as exponential moving average every five seconds: LA(t) = LA(t-1) + EXP_R * (n(t) - LA(t-1)) where LA(t-1) - is the LA ...
2
votes
0answers
124 views

What is the relation between IO wait utilisation and load average

Load average uses processes that are running or runnable or in uninterrupted sleep state. So do the processes in uninterrupted sleep state correspond with the %wa as per the top command? Both are ...
2
votes
0answers
6k views

How to find the cause of High Load Average on Linux

I trying to find the reason why my server is getting as high as 150 in load average, and some time it get up to 200. This is a Ubuntu Server running on a VMware ESXi virtual machine, with 8 CPU and ...
2
votes
1answer
1k views

Unusual high load average (due to peak I/O wait? irqs?)

I have a problem with high load average (~2) on my (personal laptop) computer for a long time now. I am running Arch Linux. If I remember correctly, the problem started with a certain kernel update, ...
2
votes
0answers
434 views

Does high Load average cgroups give “wrong” overall load average

Assume you have a system with 2 processors. Now create a cgroup and configure this group to use only 1 processor. Populate it with enough processes to give it a load average of 5 (to prove a point); ...
2
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0answers
58 views

Top show high CPU on process but idle on load average [duplicate]

I am running FreePBX on DigitalOcean VM. I am facing some call dropping issue in Asterisk. When looking at "htop", "top" and FreePBX GUI, I see different results of CPU utilization and can't ...
1
vote
2answers
1k views

linux top load average seems too high

Following this https://unix.stackexchange.com/a/279354/108702, I ran; lscpu | grep -E '^Thread|^Core|^Socket|^CPU\(' CPU(s): 8 Thread(s) per core: 2 Core(s) per socket: 4 Socket(s): ...
1
vote
1answer
4k views

What could be the cause for going to uniterruptable deep sleep state for this particular make process?

I am trying to understand 'D' state correctly. In my case, the following process went to 'D' state: make -f freac/CMakeFiles/freac_objs.dir/build.make freac/CMakeFiles/freac_objs.dir/build It is ...
1
vote
1answer
24 views

Is there a way to get a top of something that happened at a particular time

Is there a way for someone to take a look at system activity, like load averages and system processes that happened at an earlier time of the day? I mean is there a command for that? Say for example, ...
1
vote
1answer
387 views

Disk I/O and load average peaks once every hour

We have updated our server from Debian Wheezy to Jessie and from php5.6 to php7.0, but now we have a disk I/O and load average peak exactly every hour. The exact time depends on the system start time. ...
1
vote
1answer
808 views

High CPU load on the embedded Linux of my router

I hope that, as long as this question refers to Linux, could be answered here: I have a DSL router from Observa Telecom, model BHS-RTA : Modem Name : BHS_RTA Serial Number : D861940E5088 Time and ...
1
vote
2answers
181 views

High CPU load average; how to find the root cause?

It is hard task to find the root cause of CPU load average many commands are used to give partial picture. I am not sure if somewhere we can find a tool that knows how many CPU's we have on machine ...
1
vote
2answers
511 views

System Load averages

As a disclaimer, I have read related question to this topic, but still a bit confused in regards to the situation I am seeing. Understanding system load and also: Understanding top and load average ...
1
vote
0answers
38 views

linux server sudden slow downs without high load

I have a web server with the following specs: i7-4770K, 32GB RAM, 500GB SSD (1000 Mbit/s connection). The server is dedicated for the server side of an Android dating application. The app has around ...
1
vote
0answers
30 views

Understanding load average on Digital Ocean droplets

I apologize for this being a stupid question. I spend most of my time on stackoverflow and feel like a fish out of water over here. I have a standard Digital Ocean droplet, paying $5 a month, and ...
1
vote
0answers
57 views

During what kinds of operations is a process considered for the 'load average'?

In general, I'm trying to understand the numbers displayed by uptime (and numerous oder commands): $ uptime 13:40:52 up 18 days, 2:10, 8 users, load average: 0.20, 0.30, 0.64 Here, my system's ...
1
vote
0answers
79 views

My server load under 40 is healthy?

When I run the following command less /proc/cpuinfo I get list of 40 CPUs, does that mean my system can load go up to 40 and things still be running smoothly?
1
vote
0answers
498 views

LVM mirror creates high load from time to time, how to lower these effects?

Or: How to throttle down one LVM mirror leg lowering its assumed synchronization cpu load? Is it possible to tweak a LVM mirror configuration so it takes it easy on mirroring files? Whenever there ...
0
votes
1answer
72 views

How to get smaller resolution of load average (<1 minute)

I'm trying to build a service that blocks other requests if the server overloaded. But the load average of 1 minute is not good enough for this, the logic is something like this: if load_average > ...
0
votes
2answers
762 views

uptime + cpu load average [closed]

we have the follwing CPU details more lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 32 On-line CPU(s) list: 0-...
0
votes
1answer
67 views

Will the load average of my Linux box increase if it reaches file descriptors or TCP connections limit?

Will the load average of my Linux box increase if it reaches file descriptors or TCP connections limit ?
0
votes
1answer
442 views

Questions about CPU usage [closed]

How bad/normal/good is this CPU usage? Cpu0 : 14.4%us, 6.3%sy, 0.0%ni, 78.8%id, 0.0%wa, 0.0%hi, 0.5%si, 0.0%st Cpu1 : 88.3%us, 8.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 3.7%si, 0.0%st ...
0
votes
1answer
413 views

how much maximum load average can be achieved with 8 processors each with 4 cores

I have been trying to understand what is the maximum load average I can go in Ubuntu. when I run, cat /proc/cpuinfo It produces this, processor : 0 vendor_id : GenuineIntel cpu family : 6 ...
0
votes
1answer
117 views

What is the threshold for top to label a process as idle

With the top command I can toggle, whether to list idle processes or not. What is the CPU usage limit for a process to show up as idle or non-idle?
0
votes
1answer
48 views

Process with 1% CPU usage causing load average of 1.5

We recently observed a high load average of about 1.5 on our embedded system, even though pretty much all processes are supposedly sleeping (according to htop). The system in question is a dual-core ...
0
votes
0answers
8 views

Monitor the resource consumption during a system load and send a report to a file

I would like to monitor the resource consumption (cpu, ram, disk) during a system load and send a kind of report to a file during this load, RHEL7 operating system. Can you recommend any way to do ...
0
votes
1answer
699 views

Is it possible to calculate CPU utilization from load average & top CPU% column

I have a file which contains 2 output of uptime load average & CPU% column like an output from top command. So, is it possible to calculate it into CPU utilization or CPU usage at a time? ...
0
votes
1answer
214 views

Load average for specific time with all programms

I'm searching for a linux tool to make some "performance tests". I have two (or more versions) of programms wihch do the same. To compare versions with each other I want to run these for a specific ...
0
votes
2answers
287 views

High Load Average:Red Hat Linux: 2.6.32-504.16.2.el6.x86_64: VMware Platform

I virtual machine running red hat Linux and most of the time we see high load average on the machine causing interruption of services. 04:24:08 up 248 days, 11:14, 3 users, load average: 142.04, 79....
0
votes
1answer
2k views

Why is load average being reported as 0.00 though system is busy doing work?

uptime, top, cat /proc/loadavg all reporting load averages for the last 1/5/15 minutes as 0.00, but the system is definitely busy doing work. Why is this? Server is running Red Hat Enterprise Linux ...
0
votes
0answers
706 views

File to access for CPU load average on AIX

Is there a file with the load average in it on AIX? I'm looking for something like Linux's /proc/loadavg.
-2
votes
2answers
6k views

High Load Average, how to fix it? [closed]

I need to fix my virtual server. What's wrong with it? Needs memory? or else? 4 core with 4GB memory top - 10:06:13 up 53 min, 1 user, load average: 31.74, 30.17, 24.79 Tasks: 180 total, 1 ...
-5
votes
5answers
521 views

What is the Unix command-line command to get the system load information?

In Linux or Unix operating system, I am getting the text System load as below. Can anyone please tell me what is the meaning for that and how to extract system load % using CLI commands? ...