Top is a UNIX program that shows system usage in real time.

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25 views

how to make top show multiple CPUs (no toggling)

Is there any way to make top show multiple CPUs by default? I know how to toggle (1) But I'm running it on batch mode and the output is redirected to a file.
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2answers
2k views

Is there a way to show windows processes in Cygwin constantly

I would like to monitor processes from a cygwin shell, using top or a variant. The reason for this is its realtime reporting and constant updates. However under cygwin, top will not report on windows ...
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2answers
532 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 ...
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1answer
229 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 ...
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1answer
823 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 ...
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1answer
2k 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 ...
2
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1answer
506 views

iotop complains “CONFIG_TASK_DELAY_ACCT not enabled in kernel” 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 ...
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1answer
2k views

Weird Apache error - Apache hangs & needs restarting regularly

I've been recently receiving this weird error where Apache just becomes unresponsive and completely stops until it is manually restarted. It gets to a point where I can not longer retrieve apache ...
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1answer
448 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 ...
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1answer
116 views

Low load average with plenty of cpu-intersive processes

I see loadavg at about 1 with at least 3 processes running at full tile. How can that be? top - 11:48:32 up 147 days, 5:38, 8 users, load average: 1.08, 1.11, 1.05 Tasks: 416 total, 4 running, ...
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1answer
189 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 ?
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1answer
36 views

How to know, which process had accessed the harddrive last time and when?

How to know, which process had accessed the harddrive last time and when? Like ntopng with "last seen", but in local? The question is about Linux.
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1answer
85 views

Iostat and top show static resource usage on first value

For one of my projects, I need to obtain resource (CPU, I/O and disk-space) usage programatically. Currently I'm running shell commands (iostat) and parsing the results which works relatively well ...
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1answer
268 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 ...
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1answer
2k 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 ...
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0answers
236 views

CPU usage according to lxde applet and task manager is different than top

The CPU usage in top (htop) appears normal but the task manager and lxde CPU applet don't. Here is a screenshot: This is Lubuntu 12.04 Is this a bug?
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0answers
32 views

Top -l returning always 0.0 CPU usage when requesting single PID

On Mac OS X 10.9 (Mavericks) & 10.10 Yosemite I’m unable to get the correct CPU usage for a single process using the top -l command for example top -l 1 -ncols 3 -pid <pid> Even though I ...
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0answers
609 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 ...
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0answers
313 views

PStree with memory use?

Is there any utility out there for linux that will give me a PStree with memory use per process? I guess it's possible in theory to grab a pstree with pids, then comb ps itself for the memory use for ...
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0answers
14 views

showing memory transactions as Bps in Linux

Is there a Linux tool that shows the memory transactions as Bps (BYTE/sec)? Not the memory usage as which process allocates how much virtual address. But the memory bandwidth that which process uses ...
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0answers
12 views

user/sys/irq separate load averages

Is there a way to get load averages for each type of load on Linux? I have a router doubling as a web server and I'd like to have a load average for user+sys (i.e, time spent serving pages, roughly) ...
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0answers
50 views

Debian server is showing 0% for all processes in top / htop

I have a Debian 6 server that has always show correct CPU% in top / htop. Today when the load shot up I went to take a look and bot top and htop show all processes at 0% cpu. Weather the load is ok, ...
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19 views

CentOS: Can Top -u Display 2 or More Users?

Showing processes for 1 user is rather easy with Top: top -u someuser1 or by hitting u while top is running. Is there any way to make Top show processes specifically for 2 (or more) users? An example ...
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0answers
25 views

Script output from Curses program like mtop

I'm trying to write some automated scripts to store things like cpu usage etc. In 'top' there is a batch mode, so I can output this fine. In a program like mtop, where it uses 'Curses' and no batch ...
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24 views

ATOP Parseable Output with TAB instead space

Does anyone know how can i export ATOP data using tab as separator instead of spaces? Or if are there any way to replace the spaces outside parentheses for tabs? Thanks a lot
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87 views

Negative Priority in Top Output

interesting problem: I have four brand new servers with 4, 16-core AMD Opteron 6300 processors that have recently been installed with RHEL 6.2 with the MRG kernel. I'm trying to optimize the servers ...
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270 views

99% used memory, but 70% of unused allocated memory and 97% swap available: what can I do?

In a server with 48GB of RAM, when I run top, I see that less than 500 MB are free (1%), whereas when I sum up the column of % of memory used by each process, it is around 30%. Since only the 2.7% of ...
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0answers
107 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 ...
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0answers
167 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 ...