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

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2answers
118 views

Can I highlight my user name in top/bash?

I often use top under bash. I would like to highlight (in color, bold or other form) my user name, so that I can more easily find it in top. (Sometimes it's difficult with many users running lots of ...
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2answers
388 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
173 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, ...
2
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1answer
492 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
370 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
952 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
150 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 ?
0
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1answer
19 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 ...
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1answer
64 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 ...
2
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0answers
242 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 ...
2
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0answers
139 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
282 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
39 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 ...
0
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0answers
65 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
132 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 ...
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0answers
883 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
100 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 ...
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0answers
144 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 ...