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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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1answer
77 views

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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0answers
30 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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2answers
41 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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1answer
66 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 ...
2
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1answer
73 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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1answer
61 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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1answer
228 views

Can slow 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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1answer
211 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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1answer
116 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
314 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
74 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
2k 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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0answers
31 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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2answers
101 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" ...
0
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1answer
90 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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0answers
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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0answers
54 views

High server load after moving /var/lib/mysql

mysqld is showing as using 770% of the cpu in top. I have a script that displays the load average of the hosting and in a normal situation it is at around 3 or 4 it gets to up to 100 or more at this ...
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3answers
347 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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1answer
72 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
332 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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1answer
335 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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1answer
65 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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0answers
108 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
73 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
1k 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
793 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
402 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
8k 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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0answers
51 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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2answers
423 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 ...
3
votes
3answers
342 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
452 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
1k 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 ...
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0answers
73 views

When I ssh to my oracle server, the CPU load reduces

I am facing strange issue on an Oracle server. The server is on high CPU load everyday for around 5hrs. This starts everyday at around 03:46 AM and continues for next 5 hrs. CPU load reduces ...
6
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3answers
2k views

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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1answer
3k views

ATOP: vmcom / vmlim -> SWP is red

in ATOP I'm getting a red alert like this: vmcom 76.3G | vmlim 49.8G This is a value that is attached to the "SWP" (so "SWAP" is meant?)-line. What does this mean and what can I do against it?
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1answer
150 views

Server crashes with incredibly high load

I got a problem with a KVM-virtualized server (Proxmox-based), running on Debian 7.8 and PLESK. Sometimes there are loads > 200 (sic!) and I just do not get the reason why. The monitoring shows the ...
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0answers
546 views

determine if threads on a cpu are blocked? What are the causes of thread blocks?

The load-average reported by uptime command also displayed in top provides the the average run-queue length over time (1, 5 and 15 minutes) The run-queue length is the sum of the number of threads (...
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2answers
191 views

Medium CPU usage but high load

I know this has been asked multiple times, and generally wa causes high load even if CPU isn't the culprit. However, in our case, wa is ~0 and CPU is at ~45% on a 4 core, 8 thread dedicated server. ...
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2answers
451 views

Low CPU and Memory utilization. Does that mean server is healthy?

On a fairly busy RHEL6 server I keep noticing on average following indications CPU Usage : 2%. CPU Load AVG: 0.4,0.2,0.1 Memory Usage: 1.3 out of 16 GB This is the CPU this server has Intel(R) ...
2
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1answer
471 views

Load average increasing along with firewall throughput

I've just pushed a large change to my backend code and I've noticed a massive increase in the load average in the few hours since the push. I looked at Munin for what the problem might be and I ...
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5answers
4k views

High load due to I/O wait in Ubuntu 12.04 on EC2 instance

I am using Ubuntu server 12.04 , having trouble finding cause of load, I have seen change in response time of server from past week after reading Linux Troubleshooting, Part I: High Load It seems ...
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7answers
38k views

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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vote
1answer
826 views

System not being able to handle soft interrupts but having idle time?

I have a constant 5% and more CPU time spent in handling soft interrupts. Doe to that, the ksoftirqd is running almost constantly, but is using a very small amount of CPU (less than 1%). However, ...
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3answers
1k views

Server problems, running out of RAM, really high load average

I desperately need help in figuring out how to troubleshoot this problem I'm having. I run a fairly mission critical web server (Debian 7.5, 512MB RAM, 512MB swap, Apache, MySQL). It runs a couple ...
3
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1answer
3k views

Nagios basic: understanding check_load graph

My db server (one cpu VM) is monitored by Nagios. I've no experience with Nagios and I've trouble understanding this graph: what is the unit on vertical axis? and the averages? what is "m"?
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1answer
2k views

high load average and cpu usage

I am experiencing high CPU usage here is the stats i got from server, the consumption after every restart in 15 minutes go upto 100%, what could go wrong? I have a site in laravel installed on the ...
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0answers
1k views

Random server load spikes, number of tasks doubles, CPU/Memory consistent

We run a vBulletin forum with 6,000 visitors per day on an SSD VPS with 5GB RAM and 24 CPU Cores. On a typical day we see 30-50 concurrent users at any given moment. On busy mornings, it'll go up to ...
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1answer
616 views

Lots of connections to loopback, could be slowing us down

I'm trying to debug a sudden increase in our load average. I looked at this page to see if we were being DDoS'ed but the standout IP address was the loopback address: $ netstat -ntu | awk '{print $5}'...
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1answer
6k views

CPU 100% idle but still showing load average

I have a Blade Server with CentOS 6.4. On idle state it shows a constant load average of more than 1. However I prepared another machine having the same hardware and CentOS version and its load ...