A command-line system monitor tool that produces a frequently-updated list of processes.

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4
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1answer
176 views

grep of top output yields funny characters upon redirection to file

I am running CentOS 6 and I am trying to grep the output of top and redirect it to a file. I.e. top -u user1 -n 1 | /bin/grep somecommand &> scratch.txt The output of vim scratch.txt is ^...
1
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1answer
378 views

get `top` output for non interactive shell

I want to implement top function for the web app, is it possible to get the output of top command in non interactive shell.
1
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1answer
66 views

determine the actual memory usage of several processes that share a large memory segment

I just took a look at the output of top and it showed me (amongst other processes) the following: As once can see I have ten processes consuming approx 10GB each so 100GB in total. The computer ...
4
votes
2answers
142 views

top: how to cancel current command?

While browsing processes on a shared server in top I accidentally hit the r key which prompted me with renice. I had no clue what this was going to do with my input and found no way to go back. I ...
5
votes
1answer
1k views

Why would whois take up 100% of the CPU?

Running top on my CentOS web server shows an instance of whois running from 99-100% of one of the CPUs. I've not knowingly used whois on this server before, would it be safe just to kill this process?...
0
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0answers
24 views

High CPU usage after Version Upgrade

Not sure if is related to the version upgrade but since I have updated my Raspberry to Linux version 4.1.13+ (dc4@dc4-XPS13-9333) (gcc version 4.8.3 20140303 (prerelease) (crosstool-NG linaro-1.13.1+...
9
votes
3answers
3k views

why does htop meter show >90% while table is 0.0%?

Why do the progress meters across the top of the screen in htop show CPU usage consistently above >90% while the numbers in the table below show a nearly idle system with CPU usage and load average at ...
1
vote
1answer
217 views

How to interpreted top/htop memory usage

I have a htpc/server-ish ubuntu box running at home with kodi (xbmc) and some other webservices. I noticed kodi was laggish and ssh'ed into the box to see what was going on. I saw this htop output: ...
2
votes
1answer
45 views

Display only certain parameters in top

I have a question pertaining the 'top' command and dissecting it. What I mean by that is say for instance I wanted to display only particular parameters while top is running live, I want to only ...
2
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0answers
56 views

Is “top” accounting for Kernel Interrupts?

I have a simple interrupt that is triggered by a GPIO-input. The IRQ only increments a variable and returns. When I turn the frequency of the interrupts up to somewhere around 10-20 kHz, the system ...
1
vote
2answers
62 views

If I want to create a GUI which displays exactly the same data as TOP command does in LINUX, where do I get the data from?

I found out that I can get the PID(first column) from the /proc/[pid]/stat file, first column. I am not sure where can I find the rest of the attributes. And my guess is we need to calculate the %CPU ...
6
votes
4answers
2k views

Full username in top

On our systems user names can be up to 20 characters long. But the top commands only displays the first 8 characters. How can I configure top to display the whole user name? At the moment we use: ...
6
votes
3answers
1k views

How to freeze current task order?

I believe I have read some time ago how you can make top stop sorting the tasks so that they stay in the same line (easier to read) but still get updates for their values (in contrast to simply ...
0
votes
2answers
103 views

top how to monitor processes using regex name?

I monitor several processes with i.e. '#top -p 22055,21995' But there are many of them all starting with fwk* i.e. fwk3_dev, fwk5_dev PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ ...
1
vote
0answers
154 views

iowait monitoring in top on OSX/iMac

I'm trying to monitor the performance of a process on OSX 10 (iMac), specifically whether I/O is currently a bottleneck or not. I don't use the machine, hence I need something simple that the user can ...
1
vote
1answer
113 views

Linux top -n 1 Command doesn't get update

I'm calling the Linux top -n 1 -b command from a Qt application to get the free CPU percentage. This application calls this command every 3 seconds, but the CPU usage seems to be updated only the ...
1
vote
1answer
520 views

top/ps/mpstat showing different output

When my top shows a load of 19/20 and my ps shows root@server:/home/nohup# ps -eo pcpu,pid,user,args | sort -k 1 -r | head -5 %CPU PID USER COMMAND 122131 18695 mysql /usr/sbin/mysqld xxxxx 0....
15
votes
2answers
13k views

How to know reason of a process going to sleep state and wake it up?

When I do 'top' , I see my perl script process in 'S' state. Is there a way to know, what is making this perl process go in sleep state and ways to wake it up? Any way to debug to give more insights ...
10
votes
1answer
2k views

How to stream top snapshot into file?

Is there any way to persist the snapshot of top at that given moment into a file? I tried top > top.out but the contents were nothing like top in STDOUT: ^[[H^[[2J^[(B^[[mtop - 16:09:49 up 18 ...
7
votes
3answers
270 views

How to view summaric memory usage of groups of commands (instead of processes)

Is there a way to group similar processes when using tools like top/htop? Sometimes I just want to know whats eating my memory and some programs (browsers mostly) are using multiple processes, which ...
1
vote
2answers
110 views

Which user is running the most processes?

My top looks like this: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 6524 asjzdiwq 30 10 500m 41m 24m S 0.0 0.3 0:15.27 php-cgi 21274 asjzdiwq 30 ...
0
votes
1answer
65 views

difference between inactive and free memory in output of FreeBSD top utility?

top -d1 displays following SDRAM usage statistics on one of my older machines: 125M Active, 42M Inact, 51M Wired, 17M Cache, 34M Buf, 2720K Free In total, there is 256MiB of memory installed. ...
4
votes
1answer
8k views

CPU and core usage stats

I'm running some programs on a server and I would like to know how much % cpu I'm taking up and how many cores are being utilised by my process. To clarify, the server has 16 CPUs, all quad-core. I ...
13
votes
1answer
40k views

top command on multi core processor

I am using freescale IMX6 quad processor. I want to know if the top command lists the CPU usage of all 4 cores or of a single core. I am seeing an application's CPU usage being the same with 4 cores ...
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0answers
35 views

Debian - Memory usage [closed]

I all, I'd like to understand what happens in this system. Running top I get: KiB Mem: 496948 total, 460012 used, 36936 free, 68604 buffers and in the process list the process that ...
3
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0answers
95 views

Memory consumption over variable period of time

There are a number of questions on this StackExchange about memory consumption, notably: How to check which process is using most memory How to display top results sorted by memory usage in real ...
1
vote
2answers
14k views

Top “id” is using 50-99% of CPU

My i386 Lubuntu install is running with a constantly 100% CPU. Using top I have diagnosed "%id" as using up a lot of CPU, usually between about 50% and 99%. Why is this happening, and how can I stop ...
3
votes
2answers
1k views

PBS equivalent of 'top' command: avoid running 'qstat' repeatedly

When I run several jobs on a head node, I like to monitor the progress using the command top. However, when I'm using PBS to run several jobs on a cluster, top will of course not show these jobs, and ...
0
votes
3answers
356 views

Store CPU utilization into CSV file

OS: Debian 8 x64 I'd like to log every 5 seconds the CPU percentage into a CSV file in the format below: YYYY-MM-DD HH:MM:SS,CPU% I'm not familiar with how to use the top program to calculate the (...
62
votes
2answers
22k views

Why does `htop` show more process than `ps`

In ps xf 26395 pts/78 Ss 0:00 \_ bash 27016 pts/78 Sl+ 0:04 | \_ unicorn_rails master -c config/unicorn.rb 27042 pts/78 Sl+ 0:00 | ...
0
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2answers
49 views

Which tool can be used to configure the CPU priority of a process?

I know that you can use nice to re assign priorities of processes but which tool can be used to configure the CPU priority of a process ?
1
vote
1answer
117 views

Python processes appearing and disappearing in top

I concurrently launched around 12 Python scripts on a 24-core server (Ubuntu 14.04 LTS x64). Each of Python script takes around one hour to complete. I see in top that they appear quite sporadically, ...
1
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0answers
390 views

What's limiting my CPU usage in forked processes?

I am running some long-running programs (for scientific purposes) on a multi-core Linux box. The processes are controlled by a small daemon which restarts the next job when one finishes (I run 3-6 at ...
7
votes
2answers
7k views

Get CPU utilization stats from C program

I want to read the CPU utilization stats from a C program, I am interested in the percentage of use of CPU, steal time etc. These stats are shown in the 3rd row from the top command. I tried to parse ...
1
vote
2answers
1k views

Why I can not use all the 100% potential of CPU?

I am using my computer clusters to run a MD C program but I can not use full potential of those clusters. But the this node have 16 CPUs and I also only give 15 jobs for those CPUs. But I can not ...
2
votes
0answers
32 views

Restrict a user from viewing other user's processes [duplicate]

Suppose there are two users : user1 & user2. Now we know that if I give top -u user1, I can see only the process respective to user1. But if I do top -u user2, I can see all the process running ...
6
votes
2answers
18k views

How to see complete list of processes in top

When I do 'top', I learn that there are many processes running out of which many are in sleep state. I need to see complete snapshot of all processes at that point. the 'top' is able to show listing ...
1
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0answers
81 views

htop CPU time vs top CPU time

Both of the following pictures were taken with just seconds in between. htop shows 8:59.27 as consumed CPU time, while top shows it as 14:45:50 which seems legit. That's OS X 10.10 running on eight ...
9
votes
2answers
4k views

Why does top report the incorrect CPU usage?

I have a machine with Intel(R) Xeon(R) CPU E5520 visible as 16 logical cores (8 with HT). If I run something to eat CPU time (single threaded) top correctly reports 100% CPU usage for the process but ...
2
votes
2answers
154 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 ...
1
vote
5answers
3k views

How to find which machines are idle on a cluster of many nodes

I run measurements on a cluster consisting of 32 nodes/machines. I do not require all nodes, only 4, for example. The problem is most of the time, the nodes are busy with other people running their ...
0
votes
1answer
83 views

Substantial portion of memory used is not accounted for by user processes

I recently installed a copy of Ubuntu Server 14.04.2 LTS on a cluster. All appears to be working fine, but a large portion (around half) of our total available RAM is being used. I.e., when I run ...
1
vote
2answers
183 views

What unit is used for the memory values from top command in Linux?

I have the following snippet shown as my top command output. One real quick question here being, the values of Mem are shown in what granularity? Are they the number of bytes? Mem: 8191488k total, ...
3
votes
2answers
341 views

How can I tell which process is IO bound?

Suppose I have a large number of processes and one (or more) is IO bound, obvious by a high wa value in top. How can I pinpoint which process it is? Each process shows how much cpu is being used, but ...
0
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0answers
33 views

How do I gather average cpu use in the background?

I'm trying to determine if an issue I'm having is related to cpu use, but my impacted application doesn't allow me to change terminals once it's open. It there a way I could dump only the cpu useage ...
0
votes
1answer
226 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 ...
3
votes
0answers
33 views

Identify process

Every couple of minutes my Mac OSX machine starts running a process that consumes 10% of the CPU. It runs for a couple of seconds and then stops. I can see the process coming up in 'Top', but the name ...
0
votes
1answer
681 views

Very large values for utime and stime for foo. Is foo still running?

I am running a program foo It has been running for close to 30 days now (even more) Until around 10 days ago (I cannot be very exact) it used 100% of one cpu on my dual core laptop (it was at the ...
3
votes
1answer
371 views

Where does network waiting go in 'top'?

If top is showing high loads, and you don't know if the process causing it is doing processor time or is doing network i/o (not local i/o) how can you find that out? On our server I see high values ...
4
votes
1answer
285 views

CPU usage of file system operations not shown in top

I run the following command (which does ls for 10,000 times) in a Ubuntu Linux terminal and use the top command to monitor the CPU usage. While top shows the total CPU usage (line 2) is about 48% (13....