Questions tagged [load-average]

In UNIX family Operating Systems, the load average represents the average system load over a period of time.

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Apache causing massive load spike after reboot

My server is running Ubuntu 18.04.5 LTS, with LAMP stack (PHP 7.4), and apache version 2.4.29 using Prefork MPM. My server has 16 CPUs and 29GB of RAM. This server hosts 258 websites. Whenever I ...
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201 views

Load average explanation for multi-core systems

I'm trying to understand the Load average in my Debian system. I've read some explanations of the displayed values and I came to understand that the number represents how "overloaded" my ...
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High average load + low cpu usage + low disk usage + normal network usage + normal memory usage = ok or not?

I see high CPU average load several times a day on my server. For example, 21:20 and 22:45 on the following figure: However, my CPU, disk, and network are all OK: Disk Network CPU Memory Also do ...
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41 views

Our WordPress Auction Website increases CPU Spikes hosted in dedicated server

We have hosted our WordPress website in the dedicated server(CENTOS 7.9 kvm [server]) with 8 CPU. Our website is auction based website. So normally 20 auctions will be in live. But our website reaches ...
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Pattern in load average but CPU utilisation is random

I have one board running Linux. This is what uname -a returned: root@f1 ~# uname -a Linux f1 4.9.207+g817118864a58 #1 SMP PREEMPT Thu Oct 1 06:40:49 UTC 2020 armv7l armv7l armv7l GNU/Linu I have been ...
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811 views

ZFS: arc_prune is using 100% CPU with high load average

I have a 4 disk storage server with two ZFS raidz1 pools, and suddenly last night it started running at 100% CPU with an high load average: root@stg1:~# w 07:05:48 up 296 days, 17:19, 1 user, load ...
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74 views

Can't understand reason of high load average (LA)

I got bare-metal server with 32cores/64thrds CPU and 64GB RAM. Ubuntu 18.04 on-board. Running pgsql (low load), ~250 docker containers with python for network working. htop show me LA 120 (1/5/15 mins)...
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Using core affinity for Debian servers: isolate core to specific tasks?

I currently have an 8-core web server that is running into load problems due to heavy amounts of image processing--Imagemagick and other associated software will often spike the server's load up to 50+...
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127 views

Centos 7 - High Load, low CPU, low IO wait, no processed maked as D

I've got a CentOS 7 VM which seems to be stuck with quite high load (8-10). CPU usage is around 25%, there is no IO wait and there are no processes marked as D in top. I've been looking around as much ...
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190 views

CPU load for high performance computing

Is there a reasonable/safe level of CPU load in the context of high performance computing? I understand the meaning of load average for servers in general, but do not know what to expect for servers ...
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271 views

Directadmin Warning The system load average is X

I am not a server guru, could somebody help me understand what part of my server is under load and what can I do to fix this? My best guess is too many connection to node server + mysql, becuse most ...
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Is there a linux tool that will print Load Average and CPU percent idle every x seconds?

I cannot seem to find a tool that prints LOAD AVERAGE and CPU PERCENT IDLE every X seconds in a terminal window. I am looking for something along the lines of vmstat but with those two values that top ...
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136 views

Process blocking or disk corruption? Very high load + wait times, but low CPU/memory use

I am using a vServer that is suddenly experiencing very high wait times (10/20/30 seconds) or even timeouts on basic requests since yesterday after being in use for over a year without any problems. ...
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103 views

mysql server with high CPU usage on low loads

On a mysql server with fairly low load, I can see my mysql process using 150% CPU on htop and the system load around 1.5 at all times - sometimes spiking well over 2 The VM has 8 cores assigned to it ...
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221 views

iowait Bound Server - Load Calculations & Process Scheduling

I have a script I'm writing that runs badblocks against a disk shelf full of drives and I'm trying to understand the server load that develops and at what point the server load is critical in this ...
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Server is going down frequently (CPU 100% usage & load average over 3.5 mostly)

PHP Application hosted on Nginx server going down frequently. I checked using htop output and cpu usage is 100% and load average is more the 3. I tried restarting server and well as restarting PHP -...
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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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2answers
324 views

How to tune linux machine in order to improve CPU load average and CPU utilization

We are working with huge hadoop cluster. We have 736 datanode machines and each node have 16 core X 2 thread. On some machines we saw CPU load average (98-128 for 5 min). After deeply ...
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High load average but low CPU usage and disk I/O [duplicate]

I’m encountering a strange issue on one of my servers. This is on a KVM VPS which has one dedicated CPU core. Sometimes the load spikes to around 2.0: However, CPU usage doesn’t actually increase ...
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82 views

High wa but no IO usage

My VPS is having extremely high wa (around 90), but there is no IO usage taking place. htop: iotop: nethogs: What can be the problem here?
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425 views

Can a high load on a VPS be caused by the underlying infrastructure?

My VPS started to have random stints of high load (around 2-3, but the system becomes extremely slow, running ls takes like 30 seconds). I hadn’t changed anything on it, there was pretty much nothing ...
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279 views

System load on OpenVZ hardware node - is it reliable?

I discovered something that surprised me. On OpenVZ hardware node there is a big load, let's say the load is 210 (it have many CPU cores available but 210 is still high as for this server). But the ...
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1answer
224 views

Is load average affected by lack of memory?

I've read several articles about load average and all explained that the load average is the amount of processes in running/waiting to run state on CPU , so it's actually the CPU's run queue + the ...
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348 views

cifs/nfs server down , Client server high load average

I have an backup server in my AWS network. For maintenance i rebooted the server, after which it is not starting. My problem is all the servers were having backup server disk mounted through nfs (...
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512 views

Can low NFS IO speeds effect client host performance when commands like tar is running?

We have NFS used over firewall which is limiting the performance. And we have this occasional scenarios of load increasing on the client host, whenever some huge IO operation is being done like tar. ...
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467 views

High server load on KVM VPS

I have a KVM single core VPS optimized for hosting static content running only Nginx 1.13.8 with SSD and 1GB RAM with a hosting provider on a package of 100 Mbit/s unmetered bandwidth. OS in use is 3....
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416 views

CPU wait state (RAM) stats?

As far as I understand, the wa % stat displayed by top is the I/O wait (i.e. hard drive). Is there a way to get similar wait stats, but for when the CPU is waiting for memory? My server is pretty ...
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1answer
655 views

Find root cause for high load average happened in the past on a Linux server

I usually have Nagios agents installed on all our Linux servers so we get detailed report of what's happening on them in real-time and we also have historical data. However there is one RHEL 7 server ...
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2answers
82 views

server average load exact formula

I was in assumption cpu average load is calculated depend on number of process in running state (R state) + process waiting for I/O ( D state). But today I noticed that server is showing high load ...
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3answers
8k views

High load average, when should I be worried? [duplicate]

I have a server which runs a few hundred processes simultaneously, most of them are idle, it is some sort of web crawler it sleeps between requests for various reasons. So as a result, my load ...
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36 views

Process CPU% doubles when paired with more, similar processes

We're running into an interesting conundrum that I'd appreciate some help troubleshooting. We have a service that has several processes. To distribute load, we can startup n-processes of most types. ...
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264 views

Discrepancy between “ps aux” and the 1-minute average server load

I am a Linux rookie, so I'm trying to figure out a discrepancy. The problem is that the 1-minute average load available in /proc/loadavg doesn't make sense when compared to the output of the "ps aux" ...
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143 views

Could this process bring down the server?

I'm trying to understand why a server (AWS Ubuntu) sometime becomes unresponsive and eventually has to be restarted. While looking through top logs, I found a process that I think might be causing ...
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36 views

Does datacenter connectivity affect server load averages?

This may be a stupid question. My hosting datacenter (InMotion Hosting) just had about an hour of downtime due to 'connectivity issues'. As soon as everything started coming back up I logged into ...
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650 views

How can I *slowly* delete a large directory hiearachy to reduce disk i/o & load?

I have an ubuntu linux system. I have a directory which has a large amount of files. I can use rm -rf $NAME to delete it all. However that can use a lot of disk I/O and cause load to increase, because ...
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93 views

cpulimit, but for load? Pause a command until load avg goes below some figure?

The programme cpulimit on Linux is great. You can tell it to limit a process so that it doesn't use more than X% of the CPU. For example, I know someone who's laptop overheats if the CPU runs too hot ...
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1answer
624 views

KVM Virtual Machine high load average but low cpu and ram usage-why?

I have a web server with nginx and php-fpm 5.6. It is one virtual machine of KVM. Here is ovs between VMs. The parameters of this Vm are : 4 CPU, 6GB RAM and 50 GB disk with raw, Debian 8.6. There are ...
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530 views

How do I identify which process spikes server load

I am logging service activity to grafana and find that my linux based server shows a big spike in load exactly every 20 minutes. Is there a simple way to identify which process is causing the spike. ...
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74 views

Apache increasingly eats resources until restarted

My apache2 (Ubuntu 12.04) over some (variable) period of time comes to unusual system resources utilization. I'm positive that I don't have that amount of traffic and dos/ddos are pretty much out of ...
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119 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 ?
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1answer
85 views

Performance issues on fresh install of Debian 8

This is a fresh install of Debian 8 (minimal, netinstall). The load average is constantly >1 with sluggish response times, long hang times on login, and so on. I'm really baffled about what could ...
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2answers
2k views

Can HAProxy determine the load of a backend server and avoid sending requests to servers with a high load?

I'm wondering whether there would be an advantage or not to know the loadavg of each backend server and ask HAProxy to send the next request to the computer with the lowest loadavg. However, I have ...
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1answer
1k views

High load average on MySQL server [closed]

Recently we're experiencing serious performance problem on our MySQL server. Application server and database server are separate. At the database server end, load average getting higher in no time. ...
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1answer
546 views

How does process CPU usage relate to Load Average? [duplicate]

I have the following host / load: Two 6-core CPUs, with HT (From what I understand, max load would be 24.0) 12 "primary" processes, with sustained usage of about 50% CPU Load average: 0.86 0.98 0....
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4answers
14k views

How to calculate maximum system load average for my system?

I have a situation where I wanted to monitor my servers load, for this I am trying to set a threshold, but I am not sure what is the maximum value my server can reach. This is the current system load ...
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69 views

on server start, process hwrng in “D” state causing load_average = 1

In a newly installed server (Debian 8), the average load never goes under 1 beside the fact there is almost nothing runnning, %CPU usage is always at 0%. After some search I found the process hwrng (...
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789 views

Linux: Extreme load on idle CPU

I'm investigating a strange situation with extreme load (but low CPU, IOWAIT, SYS, disk/network activity) on one of our linux servers on which many oracle database instances are running. When having ...
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3answers
452 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. ...
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4answers
596 views

Load average 3.00 on mostly idle server

I have a VPS hosting a small web app (apache, php-fpm, mysql) that's mostly idle for now as the traffic is quite low. Surprisingly, the load average is always >= 3.00: # uptime 02:20:00 up 69 days, ...
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2answers
2k views

How can I chose a max load threshold depending on the number of available cores?

I have a pipeline that runs some computationally intensive tasks on a Linux machine. The script that launches these checks the current load average and—if it is above a certain threshold— waits until ...