General :: How To Interpret Readings Using TOP Command
Aug 2, 2010
I am using Linux as my OS and using TOP command to measure the system performance. From the readings using the TOP, I have observed the following
(1) The used memory increase significantly from 7% to 99% over sometimes? Is there a sign of memory leak? Does OS play a part in used memory? Will system performance be affected? Will system crash due to 99% used memory?
(2) What is the difference between Memory Buffers and Cached?
(3) From the readings, it was observed that Buffers readings decrease, whereas Cached readings increase over time.
(5) Should TOP be used to take readings for system performance (memory & CPU usage)? What is the recommended method to take readings?
Whereas, my applications only consume a bit of memory and CPU.
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Jun 17, 2011
I noticed that sensors reports some strange numbers regarding my PSU:
[Code]...
I have not change any sensors configuration for 3 years now (from the day that I makde my PC), and I have not seen those numbers before. So, why are the maximum levels so low? Why is the VBat and V5SB readings so messed up? Can I do something to correct it? If not, is it a problem of the PSU?
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Oct 13, 2010
I'm having trouble with a bash script. I have something like this:export VAR=`command`The problem is that "command" can return this: "** NONE **". bash will then replace each of the * by the list of files in the current directory.I want the output to be uninterpreted (i.e. VAR should contain "** NONE **", not "list of files list of files NONE list of files list of files"). It shouldn't be hard but I am unable to figure it out, and I'm not sure how to phrase the problem,
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Sep 21, 2011
time a.out
106.130u 0.000s 1:46.28 99.8% 0+0k 0+0io 83pf+0w
As per my understanding of the man page:
the first value is the time since the code execution started and ended,
the second values is the time spent in usermode
the third one being in kernel mode
Is the 99.8% indicating time spent in kernel mode?
Also, what does this indicate?
0+0k 0+0io 83pf+0w .
The program definitely takes more than a minute to execute - then why is the first value so small?
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Feb 18, 2010
I access a linux server shell via putty, but many of the keys I use do not translate across, up, down, left and right all are seen as ^[[A, ^[[B, ^[[D and ^[[C; But so is C-up, C-down, C-left and C-right. And enter is seen as C-j (which move down to the next line), and backspace is seen as C-h, which is backwards delete.
How can I stop these keys being translated into other keys (so I can, for example, configure C-h and backspace to perform two different functions) and what's doing this translation (Putty, the kernel, the shell)?
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Sep 16, 2010
With kernel 2.6.35 I get wrong readings on lm_sensors. They are about 20C off than the real values (e.g. if the CPU is at 50C, lm_sensors will show 70C). If I boot with any other kernel (like 2.6.32) I get the correct values. I'm using the 'coretemp' module on an Acer 7720 laptop. My distro is 64-bit Arch Linux.
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Sep 8, 2010
To understand the output of rpm -Va on my server?
The last few lines look like this:
Code:
I know that "c" means configuration file.
The man page explains the other codes
Quote:
But here's my question. Should I worry about rpm reporting so many file changes? And is there anything I should do?
This is a dedicated server. The host reformatted and reinstalled the software on August 24. A lot of the listed files are like this:
It looks as though the files weren't pulled from the repository but installed some other way by my host?
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Mar 27, 2010
1.What character instructd the shell to interpret a special character as an ordinary character?
2.What directory contains some of the utilities available on the system in the form of binary files?
3. What command is used to search the location of a utility?
4. What command is used to instruct the editor to write the file and quit the editor?
5. What key quits the more utility and displays the shell prompt?
6. What command starts a child shell as the super user, taking on root's identity and environment?
7. Which wildcard characters can be used for searching all the files in the system that start with "A"?
8. The user name or login name of the super user is????
[Code]....
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Jan 21, 2011
Ah, this time you've really screwed it up without covering you traces: F14 does not interpret correctly my (possibly botched up) ACPI tables and HANGS!!! With acpi=off I have to press the power button to switch my desktop off and that is really ANNOYING. Surely the Fedora engineers could have done a better job with this one.
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Mar 21, 2011
i am getting the following errors when i was using iNSPect
[root@localhost iNSpect_4_beta_3]# ./iNSpect -c out.conf -l2 out4.tr
WARNING: packetString in config file not set. Using default of " ".
WARNING: simulationSpeedAtInit in config file not set. Using default of ".01".
WARNING: simulationSpeedMinimum in config file not set. Using default of ".005".
[code].....
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Apr 25, 2011
It looks like I have one hard drive (30 GB) with three partitions, but df says my primary partition is under 9 GB? Shouldn't it be much larger?
Code:
$ sudo fdisk -l
Disk /dev/sda: 30.0 GB, 30020272128 bytes
255 heads, 63 sectors/track, 3649 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x0004b8d0 .....
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Feb 14, 2010
I have a number of errors captured by SELinux against NetworkManager - text of one of those is below. I'm not really sure how to interpret it
[code]...
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Oct 6, 2010
I've got rkhunter installed and regularly do scans immediately before & after updates & if I get warnings about 'file property updates' after the update I use 'rkhunter --propupd' to give me a clean run.I'm about to setup a ubuntu computer for my nan, I want to enable automatic security updates so she doesn't have to do anything to keep her system secure. I was planning on running rkhunter when I go to her house (about once a month) and check the dates in the resulting rkhunter.log warnings with those in the var/log/apt/history.log to see if legitimate updates caused any rkhunter warnings. I've noticed though that the 'Current file modifiation time:' in the rkhunter.log warnings are incorrect.
My system seems to be about 15 days behind the actual date, I've now run rkhunter --propupd so I have no warnings but got this one off another forum post to show what I mean:
Current file modification time: 1283341157 (01-Sep-2010 06:39:17)
I believe that the '1283341157' is the time in some strange format and the date in brackets is what rkhunter thinks it might be in human format.
1) How to interpret the 'strange date format' (1283341157 in the line above)?
2) If there's a way of configuring the date in rkhunter so that they're correct in rkhunter.log?
3) If there's a better way of keeping her system up-to-date & secure, it's her first computer & she's 86 so I think setting up automatic security updates is the way to go, it'll be one less thing to overwhelm her!
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Jul 8, 2009
I used to configure and run PHP script in Redhat Linux System for a long time ago. Now I forgot almost everything in Linux. I downloaded and install Fedora 11 Live CD. Start httpd service(Appache). It does work with html but not PHP script. And I can't remember how to configure the system to interpret PHP script.
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May 19, 2011
I've got a system that is maxing out CPU. Running "mpstat -P ALL 3 5" shows the following.
Quote:
08:30:21 PM CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s
08:30:24 PM all 100.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1001.00
08:30:24 PM 0 100.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1001.00
[code]....
All 5 groups show the same. My first question is why would CPU0 be the only one with intr/s and the others do not? Info.The OS is RHEL 5.4 running as a VM on ESXi 4.1. Memory doesn't appear to be an issue, the system has 8 GB and its only using about 1.5 GB. Second question, I'm positive the process that is the problem is the tomcat process. Does anyone know a good way to see whats happening with a specific process?
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Jul 9, 2011
GNU assembler 2.17 And without having to prefix them. I'm skimming through as info page and can't find any pseudo operator or assembler directive of this type. E.g. 74 would be a decimal number. But I want it to be hexa 74 without the need to write 0x74.
NOTE: as is the GNU assembler.
EDIT: Google led me to discover this:
Quote:
If you write numbers without an explicit indication of the base, the most recent `.RADIX S' command determines how they are interpreted. However, on the one hand, it says the most recent and, on the other one, it applies to GASP, the GNU assembler preprocessor. IDK if it is the same as as (the GNU assembler).
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Feb 25, 2010
I recently bought a Lexmark Interpret S405 printer, and the box says that it's compatible with ubuntu. I downloaded the lexmark-inkjet-09-driver-1.0-1.i386.rpm.sh, which begins installation but gives the error message The installer package is not supported by your native packaging system. The installer will exit. I also downloaded the Linux_S305_E.sh, which doesn't even begin installation. PLEASE HELP, I have two brand new Lexmark printers, (the other being an X5630) and they both refuse to install or i just have no idea how to install them.
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Mar 26, 2011
I know my way around MS Windows much better, but I just don't feel right trying to program something for Android on a Microsoft operating system. I am interested in Android programming so I followed the instructions on [URL] to install the environment on my computer...
I just installed the JDK, SDK, Eclipse successfully (or I assume):
* When I get to Step 4 where I'm supposed to run 'android' it will not run. I get the error message "android: command not found" (I am definitely in the right directory).
** When I double-click it in nautilus, it opens up in gedit. I can set the permissions in nautilus (through the properties - Allow executing file as a program) and get it to work,
My system:
Intel i7
Ubuntu 10.10 Maverick Meerkat
android-sdk-linux-x86
eclipse 3.6.2
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Jul 3, 2009
I am using openSUSE 10.3.When I install software from tarball then to record time required I send output of date to beg.txt(when installation begins) and end.txt (when installation finishes).How can I append output of date to a file so I don't need two files?
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Apr 30, 2011
I installed the Berkeley DB on the Ubuntu server and tried to access the dbxml from the command line and it returns command not found
path/to/dir/dbxml-2.5.16/install/bin$dbxml
-bash" dbxml: command not found
Can someone point me in the right direction
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Jul 21, 2010
I want to be able to use Ctrl+R to have reverse-i search. Also if I press Shift+Up Arrow after typing the first few characters of a recently executed command then the shell should complete the command by finding the most recent commmand having the same first few characters.
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Jun 7, 2010
Bash's command history is great, especially it is useful when adding the history -a command to the COMMAND_PROMPT.However, I'm wondering if there is a way to log the commands to a file as soon as the Return key is pressed, e.g. before starting the command and not on completion of the command (using the COMMAND_PROMPT option would save the command once the prompt is there again).
I read about auditing programs like snoopy and session recorder like script but I thought they're already too complex for the simple question I have. I guess that deactivating that script logs all the output of the command would lead already in the right direction but isn't there a quicker way to solve that probelm?
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Apr 14, 2011
When you run the following cp command in the BASH terminal, how does Linux know which files are the source and which are the destination when copying multiple files from one location to another?How does Linux know that the services, motd, fstab, and hosts files are the source and the /home/fred/my_dir is the destination?This question came up in a Linux class and I was not sure of the answer. I was thinking it is based on the source path entered ending with a file path and the destination being a directory, but was not sure.
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Nov 20, 2009
i'm trying to redirect the output of a command to the input of the next command. not sure if i'm going about this the right way. an easy method would be just to store the output of the previous command in a file and redirect input to read that file, but i'm curious to see if this can be done without writing to any files.
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Mar 20, 2011
Possible Duplicate: What does this cryptic bash command mean? Why this command crashes Linux? :(){ :|:& };:
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May 9, 2011
Up until now I've been using plink to remotely compile a project I'm working on. But recently the administrator from the remote server updated the distribution and messed up some configurations. My project has a lot of scripts written for tc shell (tcsh), and now the default shell is bash. There is no way to change this. Another problem is that now I need to run newgrp to change my default user group.
So... to work around this problem I've changed my .bashrc to run newgrp and then tcsh. If I do a normal connection using SSH, everything works as expected, but when using plink, or SSH to remotely execute commands, the shell gets stuck on the newgrp command. I think it's because both applications need a return value from newgrp to send the command I need to execute. Remotely running scripts that call a shell also get stuck like newgrp (newgrp also opens a new shell and that's why it gets stuck) my .bashrc is as follows:
Code:
user_grp=`id -g`
if [ $user_grp != 4919 ]; then
newgrp new_group_id
else
[code]....
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Apr 4, 2011
i want in the website they ask to enter some input.Code:echo -e "<p>Please Enter Year : c</p> "read Yearif i use this command it will ask the user to enter year in command. but what i want is they ask the user to enter year in web browser.
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Apr 29, 2010
i want to disable the su command on a server so that users cant run the su command i removed the comment from the 3 and 5 line in /etc/pam.d/su file but it doesnt seem to work the file is shown below
#%PAM-1.0
auth sufficient pam_rootok.so
# Uncomment the following line to implicitly trust users in the "wheel" group.
[code]....
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May 31, 2010
What's the command to delete bash command history?
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Aug 19, 2009
I have a script which builds a project and then runs junit tests. However, if the build fails, the junit tests fail with the same error message.Therefore the command which runs the junit tests should only be executed if the build was successful.
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