Questions tagged [top]

top is a Unix/Linux/BSD program to show what processing are running. It can show the top users of CPU or memory.

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75 views

My server has a high usage of buff/cache RAM?

Recently I saw that my server Ubuntu 18.04 LTS has a high usage of buff/cache memory. free -mh total used free shared buff/cache available Mem: 7.8G ...
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1answer
74 views

Number of virtual cores + how to know the right value

from lscpu we get the following lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 48 On-line CPU(s) list: 0-47 ...
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1answer
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hot added vCPU for linux not used fully in top command

just recently we started to see high CPU pressure on one of our machines. All our machines are running Linux Debian and we use vmware under the hood. We have hot added new CPUs and they're online in ...
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1answer
44 views

Is running a script a process? [closed]

I run ./install.sh and I tried to background it to be able to close the ssh session. But after running bg the process is again outputting to the terminal. Also, I don't see anything with jobs. ...
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1answer
27 views

Load is 4000, CPU flatlined, remote reboot does nothing

I have a Debian 9 server and the load is over 4000. "top" claims there are 18,132 processes sleeping. Initially, I saw many "ps" processes, hundreds, so I killed them all by name. I don't see any ...
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Installation of atop/atopsar 2.4 on Ubuntu 18 for NVMe disks

I need an help to upgrade atop/atopsar for storing and reviewing the history of disk activity for my environment. The stable version of atop available on Ubuntu 18 (2.3.0) does not recognize NVMe ...
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3answers
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Interpretation of server HTOP - is server Overloaded?

I have a server, which has 12 Cores, and usage is 42. What does it mean? As far as I know 1 i 100% of one core. So 42 is 100% of 42 cores?
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1answer
379 views

docker stats memory lower than top's rss

I created a container, in which I've created ~10 processes. I want to analyze how much memory they're consuming. To achieve that, I ran top inside the container, and docker stats outside. In top, I ...
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1answer
201 views

AWS S3 sync command stalls and rung for a long time even when nothing new to sync

I have a cronjob that executes every minute that uses awscli s3 sync command for syncing my website with a S3 bucket. It seems the command sometimes run for a very long time for no apparent reason : ...
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1answer
581 views

How to change interval of atop log?

My system is centos 7.4 with atop 2.3.0 I want to change atop log interval from default 600 to 300,then I vi /usr/share/atop/atop.daily as below: #!/bin/bash CURDAY=`date +%Y%m%d` LOGPATH=/var/...
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1answer
277 views

FreeBSD top disk io read write units

In FreeBSD you can run "top -m io" and it will show you disk io. For example: What units is the WRITE/READ in, bytes or kilobytes or megabytes?
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1answer
77 views

Identify the top processes when the overall system has large CPU utilization in Ubuntu server

I have a Ubuntu server running in EC2. Occasionally, I get a large CPU usage 99+% utilization as measured in EC2 monitoring dashboard, even though most times it is less than 10%. Since traffic to my ...
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0answers
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How virtualization affects Linux guest reports of CPU usage?

We have a Hyper-V guest with 4 virtual cores reporting 50% usage total among all the virtual cores. That is, this 50% is what atop and top report, with a complementary 350% of "idle". That means at ...
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1answer
160 views

How to tell threads from processes in top and ps on Linux?

I find it quite confusing to differentiate threads and processes when I run top and then press H or run ps -Hef. I know that they share the same attributes, which makes them similar but was wondering ...
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1answer
16 views

Colulmn width of “top” entries

The username column in the output of top command shows a + for the names that are longer than the column width. How can I increase that? I don't see any option for that.
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Invalid cpu values in top for EC2 AWS instances

We are seeing what appear to be invalid values in top on more than one of our AWS instances: top - 08:44:56 up 259 days, 17:31, 1 user, load average: 0.01, 0.02, 0.01 Tasks: 78 total, 1 running, ...
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200 views

Why linux “top” command shows different CPU utilizations values with only one CPU?

Why does "top" command shows two different values for a Linux server with only just one CPU. I understand that it can differs when there is a multi core processor but in this case I'm using a AWS ...
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1answer
363 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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89 views

Is there any way to sort processess by UNshared (private) memory use in ps or top?

I've been able to calculate unshared memory use by summing anonymous and stack mappings from pmap -x e.g. sudo pmap -x $THE_PID |egrep 'anon|stack' | awk '{print $2}' | paste -sd+ | bc but can't ...
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2answers
662 views

Is there a way to find what processes are in nice CPU top list? [closed]

I have a top output that shows a high amount in nic CPU percentage. Is there a way to see what those processes are? And is it possible to do it from top?
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0answers
135 views

Inaccurate memory usage reading under OpenVZ?

I have got an OpenVZ-based VPS running CentOS 7.4 (Linux hostname 2.6.32-042stab116.2 #1 SMP Fri Jun 24 15:33:57 MSK 2016 x86_64 x86_64 x86_64 GNU/Linux). The workload is a single Java application. ...
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1answer
916 views

Steal Time: How to interpret strange values for %st in top on an EC2 instance

I have an Amazon EC2 t2.medium instance that is showing very strange CPU Steal Time values, mostly large negative numbers and also very high idle CPU numbers. Anything that explains such strange ...
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2answers
144 views

How can I adjust the name of a process I run?

I have a rack/ruby application on a server. I run it as follows: nohup rackup -o 0.0.0.0 -p 1234 & In the output of "top" command it appears as simply "ruby" PID USERNAME THR PRI NICE ...
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1answer
322 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
574 views

Why are cpu usage percentage different between top and iostat?

On a heavily loaded database server, I am getting vastly different output from top and iostat for cpu usage. Why might the value be different? top: %Cpu(s): 84.7 us, 11.8 sy, 0.3 ni, 2.4 id, 0.6 ...
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963 views

Top command - overall cpu usage is lesser than process' cpu usage

top - 14:51:31 up 11:24, 5 users, load average: 0.79, 0.95, 0.97 Tasks: 173 total, 2 running, 171 sleeping, 0 stopped, 0 zombie %Cpu(s): 9.1 us, 4.5 sy, 0.0 ni, 85.5 id, 0.0 wa, 0.0 hi, ...
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1answer
84 views

top command from a VPS [closed]

When I run top from my VPS, at the %Cpu(s) row, I see a few values, e.g. %us, %sys, %wa, etc I'd like to ask whether these are the stats for the VPS only, or for the whole node (dedicated server)? ...
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1answer
658 views

Cpu usage percentage with Top

I'm evaluating performance of a software on a server. To do that I'm watching at Top command output. Anyway sometimes the process exceed the 100% cpu usage. How this is possible? What means 120% cpu ...
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1answer
89 views

Seeing `git status -s` in top every 30 seconds

I have been seeing a git status -s showing up in top every 30 seconds and can't figure out what's calling this command. It's showing 20%–60% CPU (on a busy 24gb production Linode running Debian 8.1) ...
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1answer
262 views

Process claims to use a lot of memory, but 'free' indicates that the memory is still free

I've seen the opposite of this, but this is puzzling. In short, I have a process where %MEM claims to use 74% of memory when using 'ps' and 'top'. However, 'free' shows that I'm only using 32% of the ...
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1answer
67 views

how to find Linux processes started at a certain time

I am trying to debug Linux vnc session that is not responding. I think I clicked the KDE konsole icon and that is when the vnc session became frozen. I can see the windows and menu in KDE but nothing ...
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1answer
445 views

SNMPD reporting conflicting CPU usage to top/htop

I've got a bit of an issue with reporting discrepancies. I've currently got a server running Ubuntu 14.04.1 trusty and am receiving SNMP alerts saying that 2 of my cores are at 100% usage. When I ...
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2answers
6k views

CentOS7 kswapd0 process eating 99% CPU

When I run top on centos7, I found kswapd0 eating 99% CPU, as shown in the screenshot above. Below is some other information top - 11:38:04 up 32 days, 16:14, 1 user, load average: 0.06, 0.13, 0....
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3answers
4k views

High CPU usage without useful information from top command

Over the past 2 days I started having problems with a server which has a few users on it. The server is an OpenVZ VPS. Normally when I experience high CPU usage, I always use top command to find out ...
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1answer
433 views

atop not working properly

I've (yum) installed atop utility in centOS 6.8. But when I run any atop command (eg: atop -a) , it is giving the following error in commandline. Malloc failed for current sysstats However, I'm ...
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2answers
2k views

How much of my memory is actually used?

I have a VPS with 8 GB of memory running mainly docker containers. When I go to the cloud monitoring service provided by my provider, I see that ~10% of the RAM is used. I don't understand how this ...
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1answer
966 views

Solaris 10 top more free memory than real

When I type TOP command in my server I get result: CPU states: 79.3% idle, 9.2% user, 11.6% kernel, 0.0% iowait, 0.0% swap Memory: 16G real, 19G free, 283G swap in use, 115G swap free I don't ...
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0answers
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Why do top and csysdig give different memory usage information?

I loaded a large dataset into memory in python as follows: data = dict(np.load(open('/path/to/data', 'rb'))) free and top (and also htop) both show that a lot of memory is in use: $ free -h ...
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1answer
54 views

Shift+E to change units in top does not work

I want to toggle the sizes top shows. top -M does work, but when I try to toggle the sizes after top has opened using shift+E (as some suggested) it does not work. Why is that and what is the ...
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1answer
66 views

Why wordpress sites top -c showing that only index file is used

I am want to that Why wordpress sites top -c showing that only index file is used. What all request are handle by index.php? when every time i check top -c it's show as below: 743204 (Trace) (Kill)...
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2answers
484 views

KVM Virtual Machine Guest - Get Top Output from KVM Host? Guest Monitoring Tools?

Is there a way to get the top output from a KVM virtual machine guest from the KVM host? I didn't see a way to get the list of processes using virsh. I'd really like to know what one of my virtual ...
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4answers
1k views

10 GB of RAM unaccounted for by top

Here's my free and smem output: danslimmon@bad-server:~$ free -m total used free shared buffers cached Mem: 30147 29928 218 6 ...
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0answers
499 views

Nagios check_mem reports incorrect swap usage

We use check_mem.pl to check memory usage in Nagios. On one of our CentOS 6 servers, the check reports a warning about swap usage. However, upon checking, the server doesn't seem to use any swap. ...
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1answer
2k views

How to understand the “SIZE” output of the command top on FreeBSD

I am working on a VPS with 512 of RAM, I installed mysql, run the command top and found that the value of SIZE for mysql is 638M: last pid: 2023; load averages: 0.17, 0.19, 0.21 ...
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1answer
538 views

linux + atop + chart alternative from atop

I use the atop in order to verify the performance top history and know by the values the status for each time my question is , what the alternative for atop that can view the values in chart? or ...
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2answers
540 views

Why is this server reporting high memory usage

It seems that given the memory percentage of the processes listed, my server should not be at 98% memory usage. Why is the cumulative memory usage so high? top - 14:34:50 up 14 days, 22:54, 3 users, ...
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2answers
55 views

Application Running as multiple processes

I have a java/tomcat application running on RedHat linux. Initially when I start the application, everything seems to be working perfectly fine. However, after some time, I guess 1-2 days, I witness ...
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1answer
50 views

Understanding top and tuning

I have allowed Postgres 30GB of RAM on our server. When running intensive tasks, I think it is swapping. As I understand it: VIRT - virtual memory (ie: swapped to disk) RES - complete memory usage ...
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1answer
2k views

Linux top in RES what does the 't' suffix stand for

When monitoring my system with top, I noticed that under RES some values have a 't' suffix, but I can't see any indication of what this means. PID USER PR NI VIRT RES SHR S %CPU %...
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1answer
581 views

What do angle brackets (“less than”) mean in busybox 'top' command process STAT column?

I am looking at Busybox top command: Mem: 39444K used, 4404K free, 0K shrd, 0K buff, 24704K cached CPU: 4% usr 7% sys 0% nic 87% idle 0% io 0% irq 0% sirq Load average: 0.02 0.12 0.10 1/...

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