0
votes
1answer
47 views

Weird output from linux `top` command

I got a weird output from command top, which shows the summation of the RES column is greater than my physical memory. For instance, I have a host with 64G physical memory and the swap partition has ...
0
votes
1answer
32 views

What is the point of sorting by PID and username in top?

I've been using the top program to find the most CPU and memory hungry programs on linux systems. Only recently did I discover the multi-window mode. The default windows number 2 (teal) and 4 (yellow) ...
2
votes
1answer
35 views

Sorted tree view in htop or alternative?

I am running a Debian flavor of Linux, and I use htop to keep track of memory usage, since it is more detailed than top. I can't seem to get it to sort by memory and display process trees at the same ...
0
votes
1answer
32 views

top output Time+ information misleading

I am running SuSE 11.2. Shen I am running "top" command on one of my machine, it looks like this: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND ...
2
votes
2answers
29 views

Redirecting top when multiple CPU's shown

If you run top, and then press 1, it shows the breakdown of usage on each CPU. How can I redirect this to a file? I know I can do top -n 1 > process.txt but how can I get the 1 option in the ...
0
votes
1answer
153 views

RAM size mismatch: top/htop vs dmidecode

I've got lenovo ideapad Y530. According to dmidecode, I should have 3GB RAM: tomasz@tomasz-lenovo-ideapad-Y530:~$ sudo dmidecode --type memory [sudo] password for tomasz: # dmidecode 2.9 SMBIOS 2.4 ...
0
votes
1answer
114 views

pidstat -u -I shows cpu usage 385%

I have a guest running in qemu doing linux kernel compilation. From host, I am watching its usage with below command pidstat 4 -p pid_of_process -u -I -I flag should average out for all number of ...
0
votes
1answer
212 views

Is using top a robust way of measuring system CPU usage?

I got confused while reading this question on stack overflow. The asker says: "'top' will simply not do, as there is a delay between cpu dumps, it requires 2 dumps and several seconds, which hangs ...
2
votes
0answers
303 views

Why is the kernel and the watchdogs consuming all the CPU?

I run a bunch of heavy user space processes on a powerful Xeon machine (32 virtual processors according to /proc/cpuinfo). The CPU load is normally around 30 and the machine feel responsive, but later ...
0
votes
0answers
78 views

Top missing some processes

I'm getting weird behavior using top in Arch Linux. When filtering by user (fred) I get a different list of processes depending on the sort order. In descending PID order: PID USER %CPU %MEM ...
2
votes
1answer
352 views

ps and top give different CPU usage

I've seen a few posts similar to this, most notably here, but wasn't quite satisfied with the answers. I'm comparing top and ps results on a specific process and see huge discrepancies in CPU usage. ...
1
vote
1answer
265 views

Monitoring CPU usage of Virtualbox with top

I'm using the top command in Linux to keep a close eye on Virtualbox which is running a VM. The current CPU in the server is a Quad Core Xeon processor 3.3 Ghz and I have only assigned one core to ...
2
votes
1answer
773 views

cpu load measure with hyperthreading on linux

How can I get the true usage of a multicore hyperthreading enabled cpu? For example lets consider a 2 core CPU, expressing 4 virtual cores. A single threaded workload would now show up as 100% in ...
1
vote
0answers
148 views

iotop complains “CONFIG_TASK_DELAY_ACCT not enabled in kernal” only for specific process

I'm trying to use iotop to determine whether the CPUs are waiting on I/O at any point for a specific program called bwa (it's a next-generation sequence alignment program). If I start iotop without ...
1
vote
1answer
224 views

Is my top statement saying my asterisk server is using too much resources?

I installed an asterisk server on my VPS with linode. I have 1 GB of ram. I'm not sure what kind of CPU is in use. I decided to test the number of concurrent calls my system can handle. So I used ...
0
votes
1answer
208 views

The outputs of ps and top do not match

I have a situation where I have a process, say script.pl (here it is), which seems to stick around in the output to ps auxw | grep script.pl, sometimes when load is heavy it sticks around for several ...
4
votes
1answer
235 views

How to identify what is causing sys% in top?

top on one of hex cores with hyper threading shows the following Cpu0 : 2.3%us, 58.8%sy, 0.0%ni, 38.2%id, 0.7%wa, 0.0%hi, 0.0%si, 0.0%st Cpu1 : 4.7%us, 62.1%sy, 0.0%ni, 31.2%id, 0.7%wa, ...
0
votes
1answer
1k views

Top command cache vs free memory

When I am running top command (on embedded system with 64 MB RAM) I am getting below description on total memory usage: "Mem: 43468K used, 968K free, 0K shrd, 1280K buff, 21896K cached" It looks ...
3
votes
2answers
1k views

Where does top command get all the data for CPU Utilization?

When I run the top command, the third line is; Cpu(s): 0.3%us, 0.3%sy, 0.0%ni, 99.2%id, 0.1%wa, 0.0%hi, 0.0%si, 0.1%st From where does top command get this data? Does it get from /proc?, if ...
1
vote
0answers
337 views

atop - next page in process list, same processes

I use atop logs to examine state of my server. I am confused next page option: ^F - show next page in the process-list (forward) atop shows me a process list as follows: 21559 ... 2013/03/13 ...
5
votes
1answer
2k views

Is there `top` for disk usage [duplicate]

How to track disk usage (write/read and other cool stuff) in realtime with fashion of top in the only right system in shell? It would be cool if it could monitor specific directory.
2
votes
1answer
170 views

'top' output baffles me

top - 18:22:21 up 98 days, 23:26, 4 users, load average: 2.73, 2.85, 2.60 Tasks: 210 total, 1 running, 209 sleeping, 0 stopped, 0 zombie Cpu(s): 3.6%us, 2.5%sy, 0.0%ni, 87.7%id, 5.1%wa, ...
0
votes
0answers
116 views

I want to see what processes do most of disk writes in Mac OS X

I run Mac OS X 10.8.2 and I want to find out what processes do most of disk writes. Ideally, I would like to see a complete report for a period of say 10 hours, with sorted data showing top ...
2
votes
2answers
906 views

Why won't top command show the right result?

You want to find the line 3427 1 root S 36964 124% 2% tmux -L l in the following screenshots of top command. Why can tmux use more than 100 percent of memory? That is confusing... Is ...
6
votes
1answer
2k views

Full list of top-like tool family for perfomance monitoring in linux: iftop iotop htop atop more? [closed]

Top-like utilities are extremely handful in my work and I want to make sure I am not missing any of them. Please extend the following list of performance monitoring (top-like) family of linux tools: ...
14
votes
1answer
16k views

Why is the “top” command showing a CPU usage of 799%?

I am running a process in a 4 core Ubuntu server. However, top command shows that the CPU usage is 799% all the time. How can this be possible? I know for multi core CPUs, more than 100% CPU usage ...
3
votes
1answer
1k views

How to kill an invisible process?

I have a program that crashed, its GUI is frozen, and I would like to kill it. However there is no trace of it among the current processes. I tried both top and ps -A, but I got nothing. The ...
4
votes
2answers
4k views

“Cannot allocate memory” while no process seems to be using up memory

I am not competent on server issues, any help is much appreciated. When try to start a python/django shell on a linux box, I am getting OSError: [Errno 12] Cannot allocate memory. free -m seems to ...
1
vote
2answers
420 views

`free -m` shows a program on linux use 322M ram, but `top` show it use 58M, why?

I have a 512M vps box on burst.net, and which has no swap. My os is centos 6.x x64. When it started, it only used 58M ram. $ free -m: total used free shared buffers ...
0
votes
1answer
207 views

How does cpu speed stepping effect the cpu usage percentages reported in (for example) htop?

How does cpu speed stepping effect the cpu usage percentages reported in (for example) htop? How about the normal top? So, if my cpu is stepped down to 800mhz with a full speed of 2ghz, does 5% used ...
0
votes
2answers
343 views

Swap implication in Linux and way to increase it

I used top command to print this on Linux box: [root@localhost ~]# top top - 23:38:38 up 361 days, 12:16, 2 users, load average: 0.09, 0.06, 0.01 Tasks: 129 total, 2 running, 126 sleeping, 1 ...
0
votes
3answers
490 views

Linux Memory Displays Half Used But No Processes Seem to Be Using It

I am running a Java script on a Fedora Core Release 6 server (Linux 2.6.19-1.2911.6.5.fc6xen x86_64) and am concerned about a lack of memory. The box has 2 GB of memory in total. Running "free -tm" ...
8
votes
4answers
3k views

Zombie process using 100% CPU

A zombie process, which should not be using any resources (RAM and CPU), is hogging up an entire core on my 8-core 64-bit Ubuntu 11.10 Desktop installation. This is the output of ps -el|grep Z: F S ...
1
vote
1answer
1k views

linux 'top' not showing all processes

I am running linux top command to see processes running inside qemu VM. Sometimes, a process does not appear in them, but if I run, ps -eo psr,pcpu,comm | grep myprocessname then the process is ...
1
vote
2answers
311 views

when we use “top -c” in Linux, which type of process is closed by brackets?

As the title said, which type of process is closed by brackets?
2
votes
2answers
888 views

Where has all my memory gone?

I have a linux server that keeps using up all it's memory and I can't see what is using it, running top igves the following response: Tasks: 103 total, 1 running, 102 sleeping, 0 stopped, 0 ...
1
vote
1answer
663 views

Linux Virtual Memory/Swap isn't being used

I think my virtual memory is not configured correctly on my MintLinux machine. I opened up a new IDE, IntelliJ IDEA, and my whole system appeared to freeze. I tried to TTL to the console but that did ...
1
vote
1answer
159 views

Is it normal to overworking of just one CPU when using openMP

When I use OpenMP in FORTRAN to parallelize a program on linux, ' top' command show me just one processor working ~%800 instead of ~%100 x 8 processors. Is it a expected situation ?
5
votes
1answer
852 views

What is a “zombie” task in top?

As the question implies, what is a zombie task/process in top?
10
votes
2answers
3k views

Why does the memory usage in “top” not add up?

I have noticed that sometimes when I run top, the memory usage of each process in the process table does not seem to add up to the total. For example, in the dump below, top says that I am using 16 ...
4
votes
1answer
1k views

If “top” indicates CPU is spending 10% on %wa (iowait), does that mean the CPU is idle?

I am referring to the Linux top command. If it indicates 10.4% was spent on wa, does that mean 10.4% CPU was available for other processes? top - 09:40:45 up 178 days, 34 min, 1 user, load ...
1
vote
4answers
3k views

memory usage linux in top is not correct

I am a bit worried about my linux vserver box. No more memory is left. To investigate this issue, i was looking at "top". But it deeply confuses me. It seems that no more memory is left, altough ...
12
votes
3answers
26k views

TOP command memory usage

Under SuSE, (Mem: 31908592k total, 31421504k used,) how do i know which process or program using my memory?
1
vote
2answers
104 views

comparing resources using top

Fedora 15 Alpha 3861 user 20 0 904m 128m 33m S 0.7 6.4 1:11.52 xulrunner-bin 1323 user 20 0 1555m 95m 31m S 13.5 4.8 4:06.87 gnome-shell ...
2
votes
1answer
397 views

What I should know about memory management?

first of all: I don't use stackadmin or similar so please don't vote for moving there, I'm reading man top and paper "what every programmer should know about memory ..." I need really simple ...
2
votes
1answer
188 views

Is it possible to change default behavior for “top”?

For example, when I run top I usually press "C" so I can see the explicit command being run not the executable name if you will. Is there a way I can modify top such that when I do: % top The ...
2
votes
1answer
2k views

Difference between nice value and priority in the top output

top, by default, lists both columns. I am curious as to what is the difference. I checked out the man pages and cannot figure it out: Priority: h: PR -- Priority The priority of the task. ...
1
vote
1answer
997 views

Top is showing % CPU > 100?

top is showing several processes with CPU % greater than 100%. What does this indicate?
3
votes
2answers
2k views

Specify top's screen width in batch mode

I am logging the output of: top -b -n1 -c so I can keep track of which processes are using how much memory and CPU each minute. When top shows the full command line (-c), the command line text gets ...
3
votes
2answers
4k views

Is it possible to 'hide' a process from the listing of `ps` or `top` on Linux

First, I presume that if this is possible it would need to be done as root (or as a user who shares root's UID of 0). How can a process be launched so that it does not show up in a ps aux or ps ef or ...