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

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16
votes
6answers
14k views

How to make a process invisible to other users?

How could you launch a process and make it invisible to the top command? The process is started by a normal user (not root), and should not be visible to other normal users.
8
votes
1answer
6k views

top output: cpu usage > 100%

Here is the top output which I gathered: I noticed that top is showing vlc's cpu usage is > 100%. Can anybody please justify me why it is showing like this, whether this is a bug in top ...
61
votes
6answers
103k views

How to monitor CPU/memory usage of a single process?

I would like to monitor one process's memory / cpu usage in real time. Similar to top but targeted at only one process, preferably with a history graph of some sort.
64
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 | ...
30
votes
2answers
36k views

Top and ps not showing the same cpu result

This is linked to this question. When I run top I get the following result: pid 3038 is using 18% cpu, however when running the result is 5.5%. And this number does not appear to be changing ...
67
votes
6answers
69k views

How to display meminfo in megabytes in top?

Sometimes it is not comfortable to see meminfo in kilobytes while you have several gigs of RAM. In Linux it looks like that: And here is how it looks in Mac OS X: Is there a way to display ...
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 ...
8
votes
5answers
4k views

Understanding top and load average

I'm observing a high load average on a certain machine (about 9) in all three load fields. I understand load as the number of processes in state "run" / currently desiring CPU time. Am I correct at ...
142
votes
7answers
171k views

How to display `top` results sorted by memory usage in real time?

How can I display the top results in my terminal in real time so that the list is sorted by memory usage?
3
votes
1answer
7k views

htop reporting much higher memory usage than free or top

The following three outputs were taken essentially simultaneously: top: top - 02:54:36 up 2 days, 13:50, 3 users, load average: 0.05, 0.05, 0.09 Tasks: 181 total, 1 running, 179 sleeping, 0 ...
2
votes
2answers
2k views

How to interpret this top command

top - 04:36:16 up 32 days, 2:33, 1 user, load average: 251.72, 250.54, 231.19 Tasks: 785 total, 249 running, 522 sleeping, 2 stopped, 12 zombie Cpu(s): 8.9%us, 90.5%sy, 0.4%ni, 0.0%id, 0.0%...
116
votes
1answer
135k views

In Linux “top” command what are us, sy, ni, id, wa, hi, si and st (for CPU usage)?

When I issue $ top in linux, I get a result similar to this (see here). One of the lines has CPU usage information represented like this: Cpu(s): 87.3%us, 1.2%sy, 0.0%ni, 27.6%id, 0.0%wa, 0.0%hi,...
54
votes
6answers
140k views

How to find which processes are taking all the memory?

I'm looking for somthing like top is to CPU usage. Is there a command line argument for top that does this? Currently, my memory is so full that even 'man top' fails with out of memory :)
11
votes
4answers
7k views

How can I receive top-like CPU statistics from the shell?

I'm trying to get an accurate read of my used CPU (in percent) from top. This is the command I'm running for testing: top -n1 | awk '/Cpu\(s\):/ {print $2}' This returns: 10.7%us, Which is the ...
11
votes
2answers
2k views

Tools for Monitoring Steal Time (st)

We're running on a virtual "dedicated" server, which should, in theory, mean that we're the only guys on the server. In practice.... I'm thinking we might not be. Notice that although it looks ...
7
votes
2answers
9k views

Top Command - How to reduce the displayed Columns

Can we get specific column in a top command, for eg I'm interested in only the memory utilization and CPU usage column. How do I reduce the displayed columns of the top command to only the above two ...
7
votes
1answer
35k views

How to check which process is using most memory

When I check free in one of Prod server it showing 70% of memory is being used: total used free shared buffers cached Mem: 164923172 141171860 23751312 ...
6
votes
2answers
9k views

How to properly run “top” command through SSH?

I have to run top command on one computer being on another. My targeted PC has IP 192.168.0.81 I was trying to do it: ssh 192.168.0.81 top But I got this result: top: tcgetattr() failed: Invalid ...
4
votes
4answers
16k views

What is the difference between ps and top command?

What is the difference between ps and top command ? I see that both can display information about running processes . Which one should be used when ?
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
1answer
4k views

Why Process CPU % Usage larger than Total CPU Time

When I run the TOP command, a process shows 1208% cpu usage and the total CPU usr time is 81.7% with IRIX mode on. When I change to IRIX mode off, the process shows 99% cpu usage and the total user ...
6
votes
2answers
3k views

iotop but for particular disk?

Is there a tool like iotop but for monitoring IO on specific volumes? (Or perhaps I missed a way to filter iotop?) If not is there any way to get at this information via (say)/proc? (dstat etc. ...
3
votes
2answers
226 views

Shouldn't there be more RAM free than this? [duplicate]

Possible Duplicate: Correctly determining memory usage in Linux I see that almost all my RAM is in use. Is this bad? Strange thing is I don't see what is actually using the RAM.
9
votes
1answer
9k views

Why the value of VSIZE in top is different from the value of VSZ (Virtual set size) in ps?

I know VSZ in ps is for the total address space allocated for the app and is sometimes aliased as vsize (mentioned in man page of ps on linux), but what's the definition of VSIZE in top? This top ...
5
votes
2answers
2k views

100.0%sy with poor disk performance

I have RHEL 5.4 kernel 2.6.18-164.el5 and I am experiencing very bad disk performance that happens randomly during working with Oracle. Nothing appears in the logs. When it happens, I see one CPU ...
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 ...
1
vote
2answers
5k views

free / top difference. Does free show virtual memory?

free -m shows me the following in my system: total used free shared buffers cached Mem: 3954 3842 111 0 248 2585 -/+ ...
1
vote
1answer
33 views

Is there any dynamically produced .log file showing up the memory usage on FreeBSD?

I am using FreeBSD 10.1-RELEASE and I was just wondering if there is any .log file produced by default from the system because I am using ELK and I want to pass this file to logstash and then ...
1
vote
2answers
315 views

How to use top with only showing CMD name

How do you use top with just showing the CMD name? I have used top with just showing the running process that I want; for example: $ top -p 19745 And if I want more than one PID, I would use: $ ...
1
vote
1answer
157 views

cpu usage is 100% but top doesn't show any process using it

First of all, I forgot to save the process list. I had to reboot the server so I can't give much information. I have a small VPS. The cpu usage was 100% in both top and in the control panel graphs, ...
0
votes
2answers
42 views

What does it mean that a page fault may or may not involve auxillary storage access in making that page available

From manpage of top nMaj -- Major Page Fault Count The number of major page faults that have occurred for a task. A page fault occurs when a process attempts to read from or ...
0
votes
0answers
17 views

Understanding shared objects in virtual memory, in the output of top

In the output of top, does SHR for a process consist of only the following parts all the shared objects in RAM, e.g. shared libraries and shared data in RAM, shared between the process and any ...