Questions tagged [load-average]

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Understanding load average on multicore system with a multithreaded app

We have a curious situation regarding load average on our system. It's running an application called ZAG that is idle most of the day. But every 80 minutes or so, it has some sort of activity burst of ...
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CPU LOAD AVRG + how to deal process with D state

we can see from our RHEL 7.6 server ( kernel version - 3.10.0-957.el7.x86_64 ) that following process are with D state ( they runs from HDFS user ) Note - D state code means that process is in ...
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why docker container consume huge CPU load average

I want to discuss about strange behavior on our rhel 7.6 server We installed Kafka exporter with container on the server – kafka-01 machine ( total CPU on machine are 12 ) The following yml file ...
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What is the best way to understand of the efficiency of my program other than load average?

Consider the following scenarios: I have only one process running on the machine and from resources like top gives 100% CPU usage which is good. I'm efficiently using the CPU. I have two processes ...
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2 answers
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High program load, when killed program process, Linux doesn't go back to 0.5 normal load. Why?

I ran a program that reached CPU load of 39.99, obviously more than my 4 core CPU can handle but why when I killed the program, (which is killed), the CPU load doesn't drop to 0.50 when I didn't turn ...
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4 votes
1 answer
826 views

Understand load average on multicore system

For only one microprocessor unit, the load average output by top could be understood that if it's above 1.0 then there are jobs waiting. But if we have n number of cores on a multicore system with l*n ...
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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 ...
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3 answers
619 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 ...
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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 ...
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2 votes
1 answer
173 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 ...
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5 answers
4k 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? ...
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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 ...
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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 ...
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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 ...
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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-...
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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): ...
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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 ...
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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 ...
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0 answers
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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 ...
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0 votes
1 answer
945 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? ...
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1 answer
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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 ...
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17 votes
1 answer
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 ...
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3 votes
1 answer
2k 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, ...
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0 answers
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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?
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2 answers
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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 ...
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3 votes
1 answer
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 ...
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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 ?
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3 votes
5 answers
10k 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,...
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1 answer
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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 ...
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2 votes
0 answers
687 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 ...
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20 votes
3 answers
22k 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 ...
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8 votes
2 answers
13k 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 ...
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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?
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1 vote
1 answer
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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. ...
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2 votes
1 answer
6k 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 ...
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2 votes
2 answers
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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, ...
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-2 votes
2 answers
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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 ...
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0 votes
1 answer
98 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 > ...
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1 vote
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601 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 ...
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2 votes
0 answers
519 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); ...
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2 answers
313 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....
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1 vote
1 answer
988 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 ...
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1 vote
1 answer
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, ...
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4 votes
2 answers
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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 ...
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0 votes
1 answer
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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 ...
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0 votes
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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 ...
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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.
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2 votes
0 answers
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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 ...
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2 votes
1 answer
108 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 ...
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2 votes
1 answer
314 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 ...
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