top is a Unix/Linux/BSD program to show what processing are running. It can show the top users of CPU or memory.
Questions tagged [top]
294 questions
4
votes
2 answers
top command occupied high cpu usage
My system is SUSE 10 and I observe that top occupies 57% CPU usage when I use it.
I don't have too many processes:
ps -eLf | wc -l
106
Here are top's stats:
cat /proc/2913/stat
2913 (top) R 2879 2913 2879 34819 2913 8396800 411 0 0 0 60648 199580…
DaVid
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4
votes
2 answers
Linux top command. Memory usage
I am testing my web server with Jmeter. I launch 40 users test, then dump top command.
What i see, is 40 (+1 host) apache processes. Each process uses appr. 7mb of RES memory. But 7*40 is 280 mb of memory. But top shows that there are 508mb total…
zim32
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4
votes
2 answers
Load average at 1, even though I've stopped all services!
I have a virtual server running Debian 5 where any action is very slow (like password verification when logging in via SSH or doing su). I checked the load average, which is hovering around 1-2. Then I stopped all services (apache, mysql, postfix,…
Aron
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4
votes
1 answer
Which PHP script is overloading my VPS?
Is there a way to get the PHP script filename that is currently hammering my VPS?
For example, when I view "top", I see:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
7622 itil 17 0 61388 11m 6004 R 45.8 2.3 0:00.13…
psx
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4
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4 answers
Linux high memory usage (top total mismatch)
I havea poor mans vps - 256MB dedicated RAM. I have installed LAMP. No website is currently UP on the server yet.
The memory usage is still 225MB (only 31 MB free).
I have measured using top and another method. Top says around 225mb used, but if I…
JP19
4
votes
5 answers
Linux server performance profiling - how to see what caused high load
If a server is experiencing high load, I use top and similar tools to troubleshoot why. However, this is only effective if I can analyze while the server is experiencing the problem.
What are some good tools for finding root cause of high server…
mark
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4
votes
5 answers
Give me my KILL-power when something goes wrong
We've had it a few times now. Suddenly our production server won't respond because a process is in an infinite loop, or the MySQL server stops serving new requests because one query is blocking everything...
We SSH to the server and use ps aux or…
Konerak
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4
votes
3 answers
Why does 'top' indicate low memory usage, whilst 'free' indicates high memory usage?
Why does 'top' indicate low memory usage, whilst 'free' indicates high memory usage?
Mem: 262144k total, 225708k used, 36436k free, 47948k buffers
Swap: 262136k total, 40k used, 262096k free, 110704k cached
PID USER PR…
Sai
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3
votes
1 answer
Why are cpu usage percentage different between top and iostat?
On a heavily loaded database server, I am getting vastly different output from top and iostat for cpu usage. Why might the value be different?
top:
%Cpu(s): 84.7 us, 11.8 sy, 0.3 ni, 2.4 id, 0.6 wa, 0.0 hi, 0.2 si, 0.1 st
iostat
avg-cpu: …
AgDude
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3
votes
1 answer
What could be causing load spikes on this EC2 instance?
I have an Amazon EC2 instance (c1.medium, ami-ed46a784) that experiences short spikes in load average every 32 hours or so. The average load is normally around 0.15 but rises to 3+ for about 15 minutes during these spikes. During this time there is…
Garret Heaton
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3
votes
4 answers
Linux memory usage
We've been having some Linux memory usage problems on some of our servers. free, top, ps, and vmstat are all showing 261M free out of 1G (~25%). However, adding up the amount of memory shown per process in top shows that we should be using very…
JamesArmes
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3
votes
1 answer
How to understand the "SIZE" output of the command top on FreeBSD
I am working on a VPS with 512 of RAM, I installed mysql, run the command top and found that the value of SIZE for mysql is 638M:
last pid: 2023; load averages: 0.17, 0.19, 0.21 …
nbari
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3
votes
2 answers
Why is this server reporting high memory usage
It seems that given the memory percentage of the processes listed, my server should not be at 98% memory usage. Why is the cumulative memory usage so high?
top - 14:34:50 up 14 days, 22:54, 3 users, load average: 0.00, 0.01, 0.05
Tasks: 139 total,…
cdosborn
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3
votes
3 answers
CentOS 7.1 - Reverting to Old Functionality of top and service
I recently installed a fresh CentOS 7.1 server. I'm noticing a few differences from CentOS 6.7, and I'm hoping there is a way to revert to an old view of certain things.
For example:
Question 1: top
The Top command displays data differently. For…
Scott Summers
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3
votes
1 answer
Running 'top' with 'Irix mode' off in batch mode
Can anyone tell me how I can tweak the following top command so that it always runs in Solaris mode in a batch mode operation?
top -d 3 -n 2 -b -p
I need 'top' to output a process' CPU usage that had already been divided by the total number…
His
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